The MySQL sys schema
A collection of views, functions and procedures to help MySQL administrators get insight in to MySQL Database usage.
There are install files available for 5.6 and 5.7 respectively. To load these, you must position yourself within the directory that you downloaded to, as these top level files SOURCE individual files that are shared across versions in most cases (though not all).
Installation
The objects should all be created as the root user (but run with the privileges of the invoker).
For instance if you download to /tmp/mysql-sys/, and want to install the 5.6 version you should:
cd /tmp/mysql-sys/
mysql -u root -p < ./sys_56.sql
Or if you would like to log in to the client, and install the 5.7 version:
cd /tmp/mysql-sys/
mysql -u root -p
SOURCE ./sys_57.sql
Alternatively, you could just choose to load individual files based on your needs, but beware, certain objects have dependencies on other objects. You will need to ensure that these are also loaded.
Generating a single SQL file
There is bash script within the root of the branch directory, called generate_sql_file.sh
, that allows you to create a single SQL file from the branch.
This includes substitution parameters for the MySQL user to use, and whether to include or exclude SET sql_log_bin
commands from the scripts. This is particularly useful for installations such as Amazon RDS, which do not have the root@localhost user, or disallow setting sql_log_bin.
When run, this outputs a file named such as sys_<sys_version>_<mysql_version_identifier>_inline.sql
, i.e. sys_1.2.0_56_inline.sql
is sys version 1.2.0, built for MySQL 5.6.
Options
- v: The version of MySQL to build the sys schema for, either '56' or '57'
- b: Whether to omit any lines that deal with sql_log_bin (useful for RDS)
- u: The user to set as the owner of the objects (useful for RDS)
Examples
Generate a MySQL 5.7 SQL file that uses the 'mark'@'localhost' user:
./generate_sql_file.sh -v 57 -u "'mark'@'localhost'"
Generate a MySQL 5.6 SQL file for RDS:
./generate_sql_file.sh -v 56 -b -u CURRENT_USER
Overview of objects
Tables
sys_config
Description
Holds configuration options for the sys schema. This is a persistent table (using the InnoDB
storage engine), with the configuration persisting across upgrades (new options are added with INSERT IGNORE
).
The table also has two related triggers, which maintain the user that INSERTs
or UPDATEs
the configuration - sys_config_insert_set_user
and sys_config_update_set_user
respectively.
Its structure is as follows:
+----------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+-------------------+-----------------------------+
| variable | varchar(128) | NO | PRI | NULL | |
| value | varchar(128) | YES | | NULL | |
| set_time | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| set_by | varchar(128) | YES | | NULL | |
+----------+--------------+------+-----+-------------------+-----------------------------+
Note, when functions check for configuration options, they first check whether a similar named user variable exists with a value, and if this is not set then pull the configuration option from this table in to that named user variable. This is done for performance reasons (to not continually SELECT
from the table), however this comes with the side effect that once inited, the values last with the session, somewhat like how session variables are inited from global variables. If the values within this table are changed, they will not take effect until the user logs in again.
Options included
Variable | Default Value | Description |
---|---|---|
statement_truncate_len | 64 | Sets the size to truncate statements to, for the format_statement() function |
Views
Many of the views in the sys schema have both a command line user friendly format output, as well as tooling friendly versions of any view that contains formatted output duplicated as an x$ table.
The examples below show output for only the formatted views, and note where there is an x$ counterpart available.
innodb_buffer_stats_by_schema / x$innodb_buffer_stats_by_schema
Description
Summarizes the output of the INFORMATION_SCHEMA.INNODB_BUFFER_PAGE table, aggregating by schema.
Example
mysql> select * from innodb_buffer_stats_by_schema;
+--------------------------+------------+------------+-------+--------------+-----------+-------------+
| object_schema | allocated | data | pages | pages_hashed | pages_old | rows_cached |
+--------------------------+------------+------------+-------+--------------+-----------+-------------+
| mem30_trunk__instruments | 1.69 MiB | 510.03 KiB | 108 | 108 | 108 | 3885 |
| InnoDB System | 688.00 KiB | 351.62 KiB | 43 | 43 | 43 | 862 |
| mem30_trunk__events | 80.00 KiB | 21.61 KiB | 5 | 5 | 5 | 229 |
+--------------------------+------------+------------+-------+--------------+-----------+-------------+
innodb_buffer_stats_by_table / x$innodb_buffer_stats_by_table
Description
Summarizes the output of the INFORMATION_SCHEMA.INNODB_BUFFER_PAGE table, aggregating by schema and table name.
Example
mysql> select * from innodb_buffer_stats_by_table;
+--------------------------+------------------------------------+------------+-----------+-------+--------------+-----------+-------------+
| object_schema | object_name | allocated | data | pages | pages_hashed | pages_old | rows_cached |
+--------------------------+------------------------------------+------------+-----------+-------+--------------+-----------+-------------+
| InnoDB System | SYS_COLUMNS | 128.00 KiB | 98.97 KiB | 8 | 8 | 8 | 1532 |
| InnoDB System | SYS_FOREIGN | 128.00 KiB | 55.48 KiB | 8 | 8 | 8 | 172 |
| InnoDB System | SYS_TABLES | 128.00 KiB | 56.18 KiB | 8 | 8 | 8 | 365 |
| InnoDB System | SYS_INDEXES | 112.00 KiB | 76.16 KiB | 7 | 7 | 7 | 1046 |
| mem30_trunk__instruments | agentlatencytime | 96.00 KiB | 28.83 KiB | 6 | 6 | 6 | 252 |
| mem30_trunk__instruments | binlogspaceusagedata | 96.00 KiB | 22.54 KiB | 6 | 6 | 6 | 196 |
| mem30_trunk__instruments | connectionsdata | 96.00 KiB | 36.68 KiB | 6 | 6 | 6 | 276 |
| mem30_trunk__instruments | connectionsmaxdata | 96.00 KiB | 31.88 KiB | 6 | 6 | 6 | 271 |
| mem30_trunk__instruments | cpuaverage | 96.00 KiB | 14.32 KiB | 6 | 6 | 6 | 55 |
| mem30_trunk__instruments | diskiototaldata | 96.00 KiB | 42.71 KiB | 6 | 6 | 6 | 152 |
| mem30_trunk__instruments | innodbopenfilesdata | 96.00 KiB | 32.61 KiB | 6 | 6 | 6 | 266 |
| mem30_trunk__instruments | innodbrowlocktimestatisticsdata | 96.00 KiB | 32.16 KiB | 6 | 6 | 6 | 261 |
| mem30_trunk__instruments | myisamkeybufferusagedata | 96.00 KiB | 25.99 KiB | 6 | 6 | 6 | 232 |
| mem30_trunk__instruments | mysqlprocessactivity | 96.00 KiB | 31.99 KiB | 6 | 6 | 6 | 252 |
| mem30_trunk__instruments | querycacheaveragefreeblocksizedata | 96.00 KiB | 27.00 KiB | 6 | 6 | 6 | 237 |
| mem30_trunk__instruments | querycacheaveragequerysizedata | 96.00 KiB | 38.29 KiB | 6 | 6 | 6 | 315 |
| mem30_trunk__instruments | querycachefragmentationdata | 96.00 KiB | 27.00 KiB | 6 | 6 | 6 | 237 |
| mem30_trunk__instruments | querycachememorydata | 96.00 KiB | 32.58 KiB | 6 | 6 | 6 | 278 |
| mem30_trunk__instruments | querycachequeriesincachedata | 96.00 KiB | 27.15 KiB | 6 | 6 | 6 | 238 |
| mem30_trunk__instruments | ramusagedata | 96.00 KiB | 15.02 KiB | 6 | 6 | 6 | 59 |
| mem30_trunk__instruments | slaverelaylogspaceusagedata | 96.00 KiB | 28.28 KiB | 6 | 6 | 6 | 249 |
| mem30_trunk__instruments | swapusagedata | 96.00 KiB | 15.02 KiB | 6 | 6 | 6 | 59 |
| InnoDB System | SYS_FIELDS | 80.00 KiB | 49.78 KiB | 5 | 5 | 5 | 1147 |
| InnoDB System | SYS_DATAFILES | 32.00 KiB | 3.97 KiB | 2 | 2 | 2 | 60 |
| InnoDB System | SYS_FOREIGN_COLS | 32.00 KiB | 7.43 KiB | 2 | 2 | 2 | 83 |
| InnoDB System | SYS_TABLESPACES | 32.00 KiB | 3.65 KiB | 2 | 2 | 2 | 56 |
| InnoDB System | SYS_IBUF_TABLE | 16.00 KiB | 0 bytes | 1 | 1 | 1 | 0 |
+--------------------------+------------------------------------+------------+-----------+-------+--------------+-----------+-------------+
innodb_lock_waits / x$innodb_lock_waits
Description
Gives a snapshot of which InnoDB locks transactions are waiting for.
Example
mysql> SELECT * FROM innodb_lock_waits\G
*************************** 1. row ***************************
waiting_trx_id: 805505
waiting_thread: 78
waiting_query: UPDATE t1 SET val = 'c2' WHERE id = 3
waiting_lock_id: 805505:132:3:28
waiting_lock_mode: X
waiting_lock_type: RECORD
waiting_lock_table: `db1`.`t1`
waiting_lock_index: PRIMARY
blocking_trx_id: 805504
blocking_thread: 77
blocking_query: UPDATE t1 SET val = CONCAT('c1', SLEEP(10)) WHERE id = 3
blocking_lock_id: 805504:132:3:28
blocking_lock_mode: X
blocking_lock_type: RECORD
blocking_lock_table: `db1`.`t1`
blocking_lock_index: PRIMARY
io_by_thread_by_latency / x$io_by_thread_by_latency
Description
Shows the top IO consumers by thread, ordered by total latency.
Example
mysql> select * from io_by_thread_by_latency;
+---------------------+-------+---------------+-------------+-------------+-------------+-----------+----------------+
| user | total | total_latency | min_latency | avg_latency | max_latency | thread_id | processlist_id |
+---------------------+-------+---------------+-------------+-------------+-------------+-----------+----------------+
| root@localhost | 11580 | 18.01 s | 429.78 ns | 1.12 ms | 181.07 ms | 25 | 6 |
| main | 1358 | 1.31 s | 475.02 ns | 2.27 ms | 350.70 ms | 1 | NULL |
| page_cleaner_thread | 654 | 147.44 ms | 588.12 ns | 225.44 us | 46.41 ms | 18 | NULL |
| io_write_thread | 131 | 107.75 ms | 8.60 us | 822.55 us | 27.69 ms | 8 | NULL |
| io_write_thread | 46 | 47.07 ms | 10.64 us | 1.02 ms | 16.90 ms | 9 | NULL |
| io_write_thread | 71 | 46.99 ms | 9.11 us | 661.81 us | 17.04 ms | 11 | NULL |
| io_log_thread | 20 | 21.01 ms | 14.25 us | 1.05 ms | 7.08 ms | 3 | NULL |
| srv_master_thread | 13 | 17.60 ms | 8.49 us | 1.35 ms | 9.99 ms | 16 | NULL |
| srv_purge_thread | 4 | 1.81 ms | 34.31 us | 452.45 us | 1.02 ms | 17 | NULL |
| io_write_thread | 19 | 951.39 us | 9.75 us | 50.07 us | 297.47 us | 10 | NULL |
| signal_handler | 3 | 218.03 us | 21.64 us | 72.68 us | 154.84 us | 19 | NULL |
+---------------------+-------+---------------+-------------+-------------+-------------+-----------+----------------+
io_global_by_file_by_bytes / x$io_global_by_file_by_bytes
Description
Shows the top global IO consumers by bytes usage by file.
Example
mysql> SELECT * FROM io_global_by_file_by_bytes LIMIT 5;
+--------------------------------------------+------------+------------+-----------+-------------+---------------+-----------+------------+-----------+
| file | count_read | total_read | avg_read | count_write | total_written | avg_write | total | write_pct |
+--------------------------------------------+------------+------------+-----------+-------------+---------------+-----------+------------+-----------+
| @@datadir/ibdata1 | 147 | 4.27 MiB | 29.71 KiB | 3 | 48.00 KiB | 16.00 KiB | 4.31 MiB | 1.09 |
| @@datadir/mysql/proc.MYD | 347 | 85.35 KiB | 252 bytes | 111 | 19.08 KiB | 176 bytes | 104.43 KiB | 18.27 |
| @@datadir/ib_logfile0 | 6 | 68.00 KiB | 11.33 KiB | 8 | 4.00 KiB | 512 bytes | 72.00 KiB | 5.56 |
| /opt/mysql/5.5.33/share/english/errmsg.sys | 3 | 43.68 KiB | 14.56 KiB | 0 | 0 bytes | 0 bytes | 43.68 KiB | 0.00 |
| /opt/mysql/5.5.33/share/charsets/Index.xml | 1 | 17.89 KiB | 17.89 KiB | 0 | 0 bytes | 0 bytes | 17.89 KiB | 0.00 |
+--------------------------------------------+------------+------------+-----------+-------------+---------------+-----------+------------+-----------+
io_global_by_file_by_latency / x$io_global_by_file_by_latency
Description
Shows the top global IO consumers by latency by file.
Example
mysql> select * from io_global_by_file_by_latency limit 5;
+-----------------------------------------------------------+-------+---------------+------------+--------------+-------------+---------------+------------+--------------+
| file | total | total_latency | count_read | read_latency | count_write | write_latency | count_misc | misc_latency |
+-----------------------------------------------------------+-------+---------------+------------+--------------+-------------+---------------+------------+--------------+
| @@datadir/sys/wait_classes_global_by_avg_latency_raw.frm~ | 24 | 451.99 ms | 0 | 0 ps | 4 | 108.07 us | 20 | 451.88 ms |
| @@datadir/sys/innodb_buffer_stats_by_schema_raw.frm~ | 24 | 379.84 ms | 0 | 0 ps | 4 | 108.88 us | 20 | 379.73 ms |
| @@datadir/sys/io_by_thread_by_latency_raw.frm~ | 24 | 379.46 ms | 0 | 0 ps | 4 | 101.37 us | 20 | 379.36 ms |
| @@datadir/ibtmp1 | 53 | 373.45 ms | 0 | 0 ps | 48 | 246.08 ms | 5 | 127.37 ms |
| @@datadir/sys/statement_analysis_raw.frm~ | 24 | 353.14 ms | 0 | 0 ps | 4 | 94.96 us | 20 | 353.04 ms |
+-----------------------------------------------------------+-------+---------------+------------+--------------+-------------+---------------+------------+--------------+
io_global_by_wait_by_bytes / x$io_global_by_wait_by_bytes
Description
Shows the top global IO consumer classes by bytes usage.
Example
mysql> select * from io_global_by_wait_by_bytes;
+--------------------+--------+---------------+-------------+-------------+-------------+------------+------------+-----------+-------------+---------------+-------------+-----------------+
| event_name | total | total_latency | min_latency | avg_latency | max_latency | count_read | total_read | avg_read | count_write | total_written | avg_written | total_requested |
+--------------------+--------+---------------+-------------+-------------+-------------+------------+------------+-----------+-------------+---------------+-------------+-----------------+
| myisam/dfile | 163681 | 983.13 ms | 379.08 ns | 6.01 µs | 22.06 ms | 68737 | 127.31 MiB | 1.90 KiB | 1012221 | 121.52 MiB | 126 bytes | 248.83 MiB |
| myisam/kfile | 1775 | 375.13 ms | 1.02 µs | 211.34 µs | 35.15 ms | 54066 | 9.97 MiB | 193 bytes | 428257 | 12.40 MiB | 30 bytes | 22.37 MiB |
| sql/FRM | 57889 | 8.40 s | 19.44 ns | 145.05 µs | 336.71 ms | 8009 | 2.60 MiB | 341 bytes | 14675 | 2.91 MiB | 208 bytes | 5.51 MiB |
| sql/global_ddl_log | 164 | 75.96 ms | 5.72 µs | 463.19 µs | 7.43 ms | 20 | 80.00 KiB | 4.00 KiB | 76 | 304.00 KiB | 4.00 KiB | 384.00 KiB |
| sql/file_parser | 419 | 601.37 ms | 1.96 µs | 1.44 ms | 37.14 ms | 66 | 42.01 KiB | 652 bytes | 64 | 226.98 KiB | 3.55 KiB | 268.99 KiB |
| sql/binlog | 190 | 6.79 s | 1.56 µs | 35.76 ms | 4.21 s | 52 | 60.54 KiB | 1.16 KiB | 0 | 0 bytes | 0 bytes | 60.54 KiB |
| sql/ERRMSG | 5 | 2.03 s | 8.61 µs | 405.40 ms | 2.03 s | 3 | 51.82 KiB | 17.27 KiB | 0 | 0 bytes | 0 bytes | 51.82 KiB |
| mysys/charset | 3 | 196.52 µs | 17.61 µs | 65.51 µs | 137.33 µs | 1 | 17.83 KiB | 17.83 KiB | 0 | 0 bytes | 0 bytes | 17.83 KiB |
| sql/partition | 81 | 18.87 ms | 888.08 ns | 232.92 µs | 4.67 ms | 66 | 2.75 KiB | 43 bytes | 8 | 288 bytes | 36 bytes | 3.04 KiB |
| sql/dbopt | 329166 | 26.95 s | 2.06 µs | 81.89 µs | 178.71 ms | 0 | 0 bytes | 0 bytes | 9 | 585 bytes | 65 bytes | 585 bytes |
| sql/relaylog | 7 | 1.18 ms | 838.84 ns | 168.30 µs | 892.70 µs | 0 | 0 bytes | 0 bytes | 1 | 120 bytes | 120 bytes | 120 bytes |
| mysys/cnf | 5 | 171.61 µs | 303.26 ns | 34.32 µs | 115.21 µs | 3 | 56 bytes | 19 bytes | 0 | 0 bytes | 0 bytes | 56 bytes |
| sql/pid | 3 | 220.55 µs | 29.29 µs | 73.52 µs | 143.11 µs | 0 | 0 bytes | 0 bytes | 1 | 5 bytes | 5 bytes | 5 bytes |
| sql/casetest | 1 | 121.19 µs | 121.19 µs | 121.19 µs | 121.19 µs | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes | 0 bytes |
| sql/binlog_index | 5 | 593.47 µs | 1.07 µs | 118.69 µs | 535.90 µs | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes | 0 bytes |
| sql/misc | 23 | 2.73 ms | 65.14 µs | 118.50 µs | 255.31 µs | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes | 0 bytes |
+--------------------+--------+---------------+-------------+-------------+-------------+------------+------------+-----------+-------------+---------------+-------------+-----------------+
io_global_by_wait_by_latency / x$io_global_by_wait_by_latency
Description
Shows the top global IO consumers by latency.
Example
mysql> SELECT * FROM io_global_by_wait_by_latency;
+-------------------------+-------+---------------+-------------+-------------+--------------+---------------+--------------+------------+------------+-----------+-------------+---------------+-------------+
| event_name | total | total_latency | avg_latency | max_latency | read_latency | write_latency | misc_latency | count_read | total_read | avg_read | count_write | total_written | avg_written |
+-------------------------+-------+---------------+-------------+-------------+--------------+---------------+--------------+------------+------------+-----------+-------------+---------------+-------------+
| sql/file_parser | 5433 | 30.20 s | 5.56 ms | 203.65 ms | 22.08 ms | 24.89 ms | 30.16 s | 24 | 6.18 KiB | 264 bytes | 737 | 2.15 MiB | 2.99 KiB |
| innodb/innodb_data_file | 1344 | 1.52 s | 1.13 ms | 350.70 ms | 203.82 ms | 450.96 ms | 868.21 ms | 147 | 2.30 MiB | 16.00 KiB | 1001 | 53.61 MiB | 54.84 KiB |
| innodb/innodb_log_file | 828 | 893.48 ms | 1.08 ms | 30.11 ms | 16.32 ms | 705.89 ms | 171.27 ms | 6 | 68.00 KiB | 11.33 KiB | 413 | 2.19 MiB | 5.42 KiB |
| myisam/kfile | 7642 | 242.34 ms | 31.71 us | 19.27 ms | 73.60 ms | 23.48 ms | 145.26 ms | 758 | 135.63 KiB | 183 bytes | 4386 | 232.52 KiB | 54 bytes |
| myisam/dfile | 12540 | 223.47 ms | 17.82 us | 32.50 ms | 87.76 ms | 16.97 ms | 118.74 ms | 5390 | 4.49 MiB | 873 bytes | 1448 | 2.65 MiB | 1.88 KiB |
| csv/metadata | 8 | 28.98 ms | 3.62 ms | 20.15 ms | 399.27 us | 0 ps | 28.58 ms | 2 | 70 bytes | 35 bytes | 0 | 0 bytes | 0 bytes |
| mysys/charset | 3 | 24.24 ms | 8.08 ms | 24.15 ms | 24.15 ms | 0 ps | 93.18 us | 1 | 17.31 KiB | 17.31 KiB | 0 | 0 bytes | 0 bytes |
| sql/ERRMSG | 5 | 20.43 ms | 4.09 ms | 19.31 ms | 20.32 ms | 0 ps | 103.20 us | 3 | 58.97 KiB | 19.66 KiB | 0 | 0 bytes | 0 bytes |
| mysys/cnf | 5 | 11.37 ms | 2.27 ms | 11.28 ms | 11.29 ms | 0 ps | 78.22 us | 3 | 56 bytes | 19 bytes | 0 | 0 bytes | 0 bytes |
| sql/dbopt | 57 | 4.04 ms | 70.92 us | 843.70 us | 0 ps | 186.43 us | 3.86 ms | 0 | 0 bytes | 0 bytes | 7 | 431 bytes | 62 bytes |
| csv/data | 4 | 411.55 us | 102.89 us | 234.89 us | 0 ps | 0 ps | 411.55 us | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes |
| sql/misc | 22 | 340.38 us | 15.47 us | 33.77 us | 0 ps | 0 ps | 340.38 us | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes |
| archive/data | 39 | 277.86 us | 7.12 us | 16.18 us | 0 ps | 0 ps | 277.86 us | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes |
| sql/pid | 3 | 218.03 us | 72.68 us | 154.84 us | 0 ps | 21.64 us | 196.39 us | 0 | 0 bytes | 0 bytes | 1 | 6 bytes | 6 bytes |
| sql/casetest | 5 | 197.15 us | 39.43 us | 126.31 us | 0 ps | 0 ps | 197.15 us | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes |
| sql/global_ddl_log | 2 | 14.60 us | 7.30 us | 12.12 us | 0 ps | 0 ps | 14.60 us | 0 | 0 bytes | 0 bytes | 0 | 0 bytes | 0 bytes |
+-------------------------+-------+---------------+-------------+-------------+--------------+---------------+--------------+------------+------------+-----------+-------------+---------------+-------------+
latest_file_io / x$latest_file_io
Description
Shows the latest file IO, by file / thread.
Example
mysql> select * from latest_file_io limit 5;
+----------------------+----------------------------------------+------------+-----------+-----------+
| thread | file | latency | operation | requested |
+----------------------+----------------------------------------+------------+-----------+-----------+
| msandbox@localhost:1 | @@tmpdir/#sqlcf28_1_4e.MYI | 9.26 µs | write | 124 bytes |
| msandbox@localhost:1 | @@tmpdir/#sqlcf28_1_4e.MYI | 4.00 µs | write | 2 bytes |
| msandbox@localhost:1 | @@tmpdir/#sqlcf28_1_4e.MYI | 56.34 µs | close | NULL |
| msandbox@localhost:1 | @@tmpdir/#sqlcf28_1_4e.MYD | 53.93 µs | close | NULL |
| msandbox@localhost:1 | @@tmpdir/#sqlcf28_1_4e.MYI | 104.05 ms | delete | NULL |
+----------------------+----------------------------------------+------------+-----------+-----------+
memory_by_user_by_current_bytes / x$memory_by_user_by_current_bytes
Description
Summarizes memory use by user using the 5.7 Performance Schema instrumentation.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from memory_by_user_by_current_bytes;
+------+--------------------+-------------------+-------------------+-------------------+-----------------+
| user | current_count_used | current_allocated | current_avg_alloc | current_max_alloc | total_allocated |
+------+--------------------+-------------------+-------------------+-------------------+-----------------+
| root | 1401 | 1.09 MiB | 815 bytes | 334.97 KiB | 42.73 MiB |
| mark | 201 | 496.08 KiB | 2.47 KiB | 334.97 KiB | 5.50 MiB |
+------+--------------------+-------------------+-------------------+-------------------+-----------------+
memory_by_host_by_current_bytes / x$memory_by_host_by_current_bytes
Description
Summarizes memory use by host using the 5.7 Performance Schema instrumentation.
When the host found is NULL, it is assumed to be a local "background" thread.
Example
mysql> select * from memory_by_host_by_current_bytes WHERE host IS NOT NULL;
+------------+--------------------+-------------------+-------------------+-------------------+-----------------+
| host | current_count_used | current_allocated | current_avg_alloc | current_max_alloc | total_allocated |
+------------+--------------------+-------------------+-------------------+-------------------+-----------------+
| background | 2773 | 10.84 MiB | 4.00 KiB | 8.00 MiB | 30.69 MiB |
| localhost | 1509 | 809.30 KiB | 549 bytes | 176.38 KiB | 83.59 MiB |
+------------+--------------------+-------------------+-------------------+-------------------+-----------------+
memory_global_by_current_allocated / x$memory_global_by_current_allocated
Description
Shows the current memory usage within the server globally broken down by allocation type.
Example
mysql> select * from memory_global_by_current_allocated;
+----------------------------------------+---------------+---------------+-------------------+------------+------------+----------------+
| event_name | current_count | current_alloc | current_avg_alloc | high_count | high_alloc | high_avg_alloc |
+----------------------------------------+---------------+---------------+-------------------+------------+------------+----------------+
| memory/sql/TABLE_SHARE::mem_root | 269 | 568.21 KiB | 2.11 KiB | 339 | 706.04 KiB | 2.08 KiB |
| memory/sql/TABLE | 214 | 366.56 KiB | 1.71 KiB | 245 | 481.13 KiB | 1.96 KiB |
| memory/sql/sp_head::main_mem_root | 32 | 334.97 KiB | 10.47 KiB | 421 | 9.73 MiB | 23.66 KiB |
| memory/sql/Filesort_buffer::sort_keys | 1 | 255.89 KiB | 255.89 KiB | 1 | 256.00 KiB | 256.00 KiB |
| memory/mysys/array_buffer | 82 | 121.66 KiB | 1.48 KiB | 1124 | 852.55 KiB | 777 bytes |
...
+----------------------------------------+---------------+---------------+-------------------+------------+------------+----------------+
memory_global_total
Description
Shows the total memory usage within the server globally.
Example
mysql> select * from memory_global_total;
+-----------------+
| total_allocated |
+-----------------+
| 458.44 MiB |
+-----------------+
processlist / x$processlist
Description
A detailed non-blocking processlist view to replace [INFORMATION_SCHEMA. | SHOW FULL] PROCESSLIST.
Performs less locking than the legacy sources, whilst giving extra information.
Example
mysql> select * from processlist where conn_id is not null\G
*************************** 1. row ***************************
thd_id: 31
conn_id: 12
user: root@localhost
db: information_schema
command: Query
state: Sending data
time: 0
current_statement: select * from processlist limit 5
lock_latency: 684.00 us
rows_examined: 0
rows_sent: 0
rows_affected: 0
tmp_tables: 2
tmp_disk_tables: 0
full_scan: YES
current_memory: 1.29 MiB
last_statement: NULL
last_statement_latency: NULL
last_wait: wait/synch/mutex/sql/THD::LOCK_query_plan
last_wait_latency: 260.13 ns
source: sql_optimizer.cc:1075
ps_check_lost_instrumentation
Description
Used to check whether Performance Schema is not able to monitor all runtime data - only returns variables that have lost instruments
Example
mysql> select * from ps_check_lost_instrumentation;
+----------------------------------------+----------------+
| variable_name | variable_value |
+----------------------------------------+----------------+
| Performance_schema_file_handles_lost | 101223 |
| Performance_schema_file_instances_lost | 1231 |
+----------------------------------------+----------------+
schema_index_statistics / x$schema_index_statistics
Description
Statistics around indexes.
Ordered by the total wait time descending - top indexes are most contended.
Example
mysql> select * from schema_index_statistics limit 5;
+------------------+-------------+------------+---------------+----------------+---------------+----------------+--------------+----------------+--------------+----------------+
| table_schema | table_name | index_name | rows_selected | select_latency | rows_inserted | insert_latency | rows_updated | update_latency | rows_deleted | delete_latency |
+------------------+-------------+------------+---------------+----------------+---------------+----------------+--------------+----------------+--------------+----------------+
| mem | mysqlserver | PRIMARY | 6208 | 108.27 ms | 0 | 0 ps | 5470 | 1.47 s | 0 | 0 ps |
| mem | innodb | PRIMARY | 4666 | 76.27 ms | 0 | 0 ps | 4454 | 571.47 ms | 0 | 0 ps |
| mem | connection | PRIMARY | 1064 | 20.98 ms | 0 | 0 ps | 1064 | 457.30 ms | 0 | 0 ps |
| mem | environment | PRIMARY | 5566 | 151.17 ms | 0 | 0 ps | 694 | 252.57 ms | 0 | 0 ps |
| mem | querycache | PRIMARY | 1698 | 27.99 ms | 0 | 0 ps | 1698 | 371.72 ms | 0 | 0 ps |
+------------------+-------------+------------+---------------+----------------+---------------+----------------+--------------+----------------+--------------+----------------+
schema_object_overview
Description
Shows an overview of the types of objects within each schema
Note: On instances with a large numbers of objects, this could take some time to execute, and may not be recommended.
Example
mysql> select * from schema_object_overview;
+---------------------------------+---------------+-------+
| db | object_type | count |
+---------------------------------+---------------+-------+
| admin | PROCEDURE | 1 |
| information_schema | SYSTEM VIEW | 59 |
| mem30_test__instruments | BASE TABLE | 1 |
| mem30_test__instruments | INDEX (BTREE) | 2 |
| mem30_trunk__advisors | BASE TABLE | 2 |
| mem30_trunk__advisors | INDEX (BTREE) | 4 |
| mem30_trunk__advisor_text | BASE TABLE | 2 |
| mem30_trunk__advisor_text | INDEX (BTREE) | 5 |
| mem30_trunk__bean_config | BASE TABLE | 4 |
| mem30_trunk__bean_config | INDEX (BTREE) | 6 |
| mem30_trunk__config | BASE TABLE | 12 |
| mem30_trunk__config | INDEX (BTREE) | 21 |
| mem30_trunk__enterprise | BASE TABLE | 2 |
| mem30_trunk__enterprise | INDEX (BTREE) | 3 |
| mem30_trunk__events | BASE TABLE | 32 |
| mem30_trunk__events | INDEX (BTREE) | 69 |
| mem30_trunk__instruments | BASE TABLE | 118 |
| mem30_trunk__instruments | INDEX (BTREE) | 587 |
| mem30_trunk__instruments_config | BASE TABLE | 1 |
| mem30_trunk__instruments_config | INDEX (BTREE) | 1 |
| mem30_trunk__inventory | BASE TABLE | 77 |
| mem30_trunk__inventory | INDEX (BTREE) | 277 |
| mem30_trunk__quan | BASE TABLE | 8 |
| mem30_trunk__quan | INDEX (BTREE) | 35 |
| mysql | BASE TABLE | 29 |
| mysql | INDEX (BTREE) | 54 |
| performance_schema | BASE TABLE | 52 |
| sys | FUNCTION | 8 |
| sys | PROCEDURE | 16 |
| sys | VIEW | 59 |
+---------------------------------+---------------+-------+
schema_table_statistics / x$schema_table_statistics
Description
Statistics around tables.
Ordered by the total wait time descending - top tables are most contended.
Also includes the helper view (used by schema_table_statistics_with_buffer as well):
- x$ps_schema_table_statistics_io
Example
mysql> select * from schema_table_statistics limit 1\G
*************************** 1. row ***************************
table_schema: mem
table_name: mysqlserver
rows_fetched: 27087
fetch_latency: 442.72 ms
rows_inserted: 2
insert_latency: 185.04 µs
rows_updated: 5096
update_latency: 1.39 s
rows_deleted: 0
delete_latency: 0 ps
io_read_requests: 2565
io_read_bytes: 1121627
io_read_latency: 10.07 ms
io_write_requests: 1691
io_write_bytes: 128383
io_write_latency: 14.17 ms
io_misc_requests: 2698
io_misc_latency: 433.66 ms
schema_table_statistics_with_buffer / x$schema_table_statistics_with_buffer
Description
Statistics around tables.
Ordered by the total wait time descending - top tables are most contended.
More statistics such as caching stats for the InnoDB buffer pool with InnoDB tables
Uses the x$ps_schema_table_statistics_io helper view from schema_table_statistics.
Example
mysql> select * from schema_table_statistics_with_buffer limit 1\G
*************************** 1. row ***************************
table_schema: mem
table_name: mysqlserver
rows_fetched: 27087
fetch_latency: 442.72 ms
rows_inserted: 2
insert_latency: 185.04 µs
rows_updated: 5096
update_latency: 1.39 s
rows_deleted: 0
delete_latency: 0 ps
io_read_requests: 2565
io_read_bytes: 1121627
io_read_latency: 10.07 ms
io_write_requests: 1691
io_write_bytes: 128383
io_write_latency: 14.17 ms
io_misc_requests: 2698
io_misc_latency: 433.66 ms
innodb_buffer_pages: 19
innodb_buffer_pages_hashed: 19
innodb_buffer_pages_old: 19
innodb_buffer_bytes_allocated: 311296
innodb_buffer_bytes_data: 1924
innodb_buffer_rows_cached: 2
schema_tables_with_full_table_scans / x$schema_tables_with_full_table_scans
Description
Finds tables that are being accessed by full table scans ordering by the number of rows scanned descending.
Example
mysql> select * from schema_tables_with_full_table_scans limit 5;
+--------------------+--------------------------------+-------------------+-----------+
| object_schema | object_name | rows_full_scanned | latency |
+--------------------+--------------------------------+-------------------+-----------+
| mem30__instruments | fsstatistics | 10207042 | 13.10 s |
| mem30__instruments | preparedstatementapidata | 436428 | 973.27 ms |
| mem30__instruments | mysqlprocessactivity | 411702 | 282.07 ms |
| mem30__instruments | querycachequeriesincachedata | 374011 | 767.15 ms |
| mem30__instruments | rowaccessesdata | 322321 | 1.55 s |
+--------------------+--------------------------------+-------------------+-----------+
schema_unused_indexes
Description
Finds indexes that have had no events against them (and hence, no usage).
To trust whether the data from this view is representative of your workload, you should ensure that the server has been up for a representative amount of time before using it.
PRIMARY (key) indexes are ignored.
Example
mysql> select * from schema_unused_indexes limit 5;
+--------------------+---------------------+--------------------+
| object_schema | object_name | index_name |
+--------------------+---------------------+--------------------+
| mem30__bean_config | plists | path |
| mem30__config | group_selections | name |
| mem30__config | notification_groups | name |
| mem30__config | user_form_defaults | FKC1AEF1F9E7EE2CFB |
| mem30__enterprise | whats_new_entries | entryId |
+--------------------+---------------------+--------------------+
statement_analysis / x$statement_analysis
Description
Lists a normalized statement view with aggregated statistics, mimics the MySQL Enterprise Monitor Query Analysis view, ordered by the total execution time per normalized statement
Example
mysql> select * from statement_analysis limit 1\G
*************************** 1. row ***************************
query: SELECT * FROM `schema_object_o ... MA` , `information_schema` ...
db: sys
full_scan: *
exec_count: 2
err_count: 0
warn_count: 0
total_latency: 16.75 s
max_latency: 16.57 s
avg_latency: 8.38 s
lock_latency: 16.69 s
rows_sent: 84
rows_sent_avg: 42
rows_examined: 20012
rows_examined_avg: 10006
rows_affected: 0
rows_affected_avg: 0
tmp_tables: 378
tmp_disk_tables: 66
rows_sorted: 168
sort_merge_passes: 0
digest: 54f9bd520f0bbf15db0c2ed93386bec9
first_seen: 2014-03-07 13:13:41
last_seen: 2014-03-07 13:13:48
statements_with_errors_or_warnings / x$statements_with_errors_or_warnings
Description
Lists all normalized statements that have raised errors or warnings.
Example
mysql> select * from statements_with_errors_or_warnings LIMIT 1\G
*************************** 1. row ***************************
query: CREATE OR REPLACE ALGORITHM = ... _delete` AS `rows_deleted` ...
db: sys
exec_count: 2
errors: 1
error_pct: 50.0000
warnings: 0
warning_pct: 0.0000
first_seen: 2014-03-07 12:56:54
last_seen: 2014-03-07 13:01:01
digest: 943a788859e623d5f7798ba0ae0fd8a9
statements_with_full_table_scans / x$statements_with_full_table_scans
Description
Lists all normalized statements that use have done a full table scan ordered by number the percentage of times a full scan was done, then by the statement latency.
This view ignores SHOW statements, as these always cause a full table scan, and there is nothing that can be done about this.
Example
mysql> select * from statements_with_full_table_scans limit 1\G
*************************** 1. row ***************************
query: SELECT * FROM `schema_tables_w ... ex_usage` . `COUNT_READ` DESC
db: sys
exec_count: 1
total_latency: 88.20 ms
no_index_used_count: 1
no_good_index_used_count: 0
no_index_used_pct: 100
rows_sent: 0
rows_examined: 1501
rows_sent_avg: 0
rows_examined_avg: 1501
first_seen: 2014-03-07 13:58:20
last_seen: 2014-03-07 13:58:20
digest: 64baecd5c1e1e1651a6b92e55442a288
statements_with_runtimes_in_95th_percentile / x$statements_with_runtimes_in_95th_percentile
Description
Lists all statements who's average runtime, in microseconds, is in the top 95th percentile.
Also includes two helper views:
- x$ps_digest_avg_latency_distribution
- x$ps_digest_95th_percentile_by_avg_us
Example
mysql> select * from statements_with_runtimes_in_95th_percentile\G
*************************** 1. row ***************************
query: SELECT * FROM `schema_object_o ... MA` , `information_schema` ...
db: sys
full_scan: *
exec_count: 2
err_count: 0
warn_count: 0
total_latency: 16.75 s
max_latency: 16.57 s
avg_latency: 8.38 s
rows_sent: 84
rows_sent_avg: 42
rows_examined: 20012
rows_examined_avg: 10006
first_seen: 2014-03-07 13:13:41
last_seen: 2014-03-07 13:13:48
digest: 54f9bd520f0bbf15db0c2ed93386bec9
statements_with_sorting / x$statements_with_sorting
Description
Lists all normalized statements that have done sorts, ordered by total_latency descending.
Example
mysql> select * from statements_with_sorting limit 1\G
*************************** 1. row ***************************
query: SELECT * FROM `schema_object_o ... MA` , `information_schema` ...
db: sys
exec_count: 2
total_latency: 16.75 s
sort_merge_passes: 0
avg_sort_merges: 0
sorts_using_scans: 12
sort_using_range: 0
rows_sorted: 168
avg_rows_sorted: 84
first_seen: 2014-03-07 13:13:41
last_seen: 2014-03-07 13:13:48
digest: 54f9bd520f0bbf15db0c2ed93386bec9
statements_with_temp_tables / x$statements_with_temp_tables
Description
Lists all normalized statements that use temporary tables ordered by number of on disk temporary tables descending first, then by the number of memory tables.
Example
mysql> select * from statements_with_temp_tables limit 1\G
*************************** 1. row ***************************
query: SELECT * FROM `schema_object_o ... MA` , `information_schema` ...
db: sys
exec_count: 2
total_latency: 16.75 s
memory_tmp_tables: 378
disk_tmp_tables: 66
avg_tmp_tables_per_query: 189
tmp_tables_to_disk_pct: 17
first_seen: 2014-03-07 13:13:41
last_seen: 2014-03-07 13:13:48
digest: 54f9bd520f0bbf15db0c2ed93386bec9
user_summary / x$user_summary
Description
Summarizes statement activity, file IO and connections by user.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from user_summary;
+------+------------+-------------------+-----------------------+-------------+----------+-----------------+---------------------+-------------------+--------------+
| user | statements | statement_latency | statement_avg_latency | table_scans | file_ios | file_io_latency | current_connections | total_connections | unique_hosts |
+------+------------+-------------------+-----------------------+-------------+----------+-----------------+---------------------+-------------------+--------------+
| root | 2924 | 00:03:59.53 | 81.92 ms | 82 | 54702 | 55.61 s | 1 | 1 | 1 |
+------+------------+-------------------+-----------------------+-------------+----------+-----------------+---------------------+-------------------+--------------+
user_summary_by_file_io / x$user_summary_by_file_io
Description
Summarizes file IO totals per user.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from user_summary_by_file_io;
+------------+-------+------------+
| user | ios | io_latency |
+------------+-------+------------+
| root | 26457 | 21.58 s |
| background | 1189 | 394.21 ms |
+------------+-------+------------+
user_summary_by_file_io_type / x$user_summary_by_file_io_type
Description
Summarizes file IO by event type per user.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from user_summary_by_file_io_type;
+------------+--------------------------------------+-------+-----------+-------------+
| user | event_name | total | latency | max_latency |
+------------+--------------------------------------+-------+-----------+-------------+
| background | wait/io/file/innodb/innodb_data_file | 1434 | 3.29 s | 147.56 ms |
| background | wait/io/file/sql/FRM | 910 | 286.61 ms | 32.92 ms |
| background | wait/io/file/sql/relaylog | 9 | 252.28 ms | 144.17 ms |
| background | wait/io/file/sql/binlog | 56 | 193.73 ms | 153.72 ms |
| background | wait/io/file/sql/binlog_index | 22 | 183.02 ms | 81.83 ms |
| background | wait/io/file/innodb/innodb_log_file | 20 | 117.17 ms | 36.53 ms |
| background | wait/io/file/sql/relaylog_index | 9 | 50.15 ms | 48.04 ms |
| background | wait/io/file/sql/ERRMSG | 5 | 35.41 ms | 31.78 ms |
| background | wait/io/file/myisam/kfile | 67 | 18.14 ms | 9.00 ms |
| background | wait/io/file/mysys/charset | 3 | 7.46 ms | 4.13 ms |
| background | wait/io/file/sql/casetest | 5 | 6.01 ms | 5.86 ms |
| background | wait/io/file/sql/pid | 3 | 5.96 ms | 3.06 ms |
| background | wait/io/file/myisam/dfile | 43 | 980.38 us | 152.46 us |
| background | wait/io/file/mysys/cnf | 5 | 154.97 us | 58.87 us |
| background | wait/io/file/sql/global_ddl_log | 2 | 18.64 us | 16.40 us |
| root | wait/io/file/sql/file_parser | 11048 | 48.79 s | 201.11 ms |
| root | wait/io/file/innodb/innodb_data_file | 4699 | 3.02 s | 46.93 ms |
| root | wait/io/file/sql/FRM | 10403 | 2.38 s | 61.72 ms |
| root | wait/io/file/myisam/dfile | 22143 | 726.77 ms | 308.79 ms |
| root | wait/io/file/myisam/kfile | 6213 | 435.35 ms | 88.76 ms |
| root | wait/io/file/sql/dbopt | 159 | 130.86 ms | 15.46 ms |
| root | wait/io/file/csv/metadata | 8 | 86.60 ms | 50.32 ms |
| root | wait/io/file/sql/binlog | 15 | 38.79 ms | 9.40 ms |
| root | wait/io/file/sql/misc | 21 | 22.33 ms | 15.30 ms |
| root | wait/io/file/csv/data | 4 | 297.46 us | 111.93 us |
| root | wait/io/file/archive/data | 3 | 54.10 us | 40.74 us |
+------------+--------------------------------------+-------+-----------+-------------+
user_summary_by_stages / x$user_summary_by_stages
Description
Summarizes stages by user, ordered by user and total latency per stage.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from user_summary_by_stages;
+------+--------------------------------+-------+---------------+-------------+
| user | event_name | total | total_latency | avg_latency |
+------+--------------------------------+-------+---------------+-------------+
| root | stage/sql/Opening tables | 889 | 1.97 ms | 2.22 us |
| root | stage/sql/Creating sort index | 4 | 1.79 ms | 446.30 us |
| root | stage/sql/init | 10 | 312.27 us | 31.23 us |
| root | stage/sql/checking permissions | 10 | 300.62 us | 30.06 us |
| root | stage/sql/freeing items | 5 | 85.89 us | 17.18 us |
| root | stage/sql/statistics | 5 | 79.15 us | 15.83 us |
| root | stage/sql/preparing | 5 | 69.12 us | 13.82 us |
| root | stage/sql/optimizing | 5 | 53.11 us | 10.62 us |
| root | stage/sql/Sending data | 5 | 44.66 us | 8.93 us |
| root | stage/sql/closing tables | 5 | 37.54 us | 7.51 us |
| root | stage/sql/System lock | 5 | 34.28 us | 6.86 us |
| root | stage/sql/query end | 5 | 24.37 us | 4.87 us |
| root | stage/sql/end | 5 | 8.60 us | 1.72 us |
| root | stage/sql/Sorting result | 5 | 8.33 us | 1.67 us |
| root | stage/sql/executing | 5 | 5.37 us | 1.07 us |
| root | stage/sql/cleaning up | 5 | 4.60 us | 919.00 ns |
+------+--------------------------------+-------+---------------+-------------+
user_summary_by_statement_latency / x$user_summary_by_statement_latency
Description
Summarizes overall statement statistics by user.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from user_summary_by_statement_latency;
+------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| user | total | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans |
+------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| root | 3381 | 00:02:09.13 | 1.48 s | 1.07 s | 1151 | 93947 | 150 | 91 |
+------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
user_summary_by_statement_type / x$user_summary_by_statement_type
Description
Summarizes the types of statements executed by each user.
When the user found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from user_summary_by_statement_type;
+------+------------------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| user | statement | total | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans |
+------+------------------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| root | create_view | 1332 | 00:03:39.08 | 677.76 ms | 494.56 ms | 0 | 0 | 0 | 0 |
| root | select | 88 | 20.13 s | 16.57 s | 17.40 s | 1804 | 77285 | 0 | 48 |
| root | drop_db | 16 | 6.83 s | 1.14 s | 5.73 s | 0 | 0 | 953 | 0 |
| root | drop_view | 392 | 1.70 s | 739.49 ms | 0 ps | 0 | 0 | 0 | 0 |
| root | show_databases | 16 | 1.37 s | 587.44 ms | 1.31 ms | 400 | 400 | 0 | 16 |
| root | show_tables | 34 | 676.78 ms | 167.04 ms | 3.46 ms | 1087 | 1087 | 0 | 34 |
| root | create_db | 22 | 334.90 ms | 38.93 ms | 0 ps | 0 | 0 | 22 | 0 |
| root | create_procedure | 352 | 250.02 ms | 21.90 ms | 165.17 ms | 0 | 0 | 0 | 0 |
| root | drop_function | 176 | 122.44 ms | 69.18 ms | 87.24 ms | 0 | 0 | 0 | 0 |
| root | create_function | 176 | 76.12 ms | 1.36 ms | 49.50 ms | 0 | 0 | 0 | 0 |
| root | drop_procedure | 352 | 67.41 ms | 1.57 ms | 36.22 ms | 0 | 0 | 0 | 0 |
| root | update | 2 | 41.75 ms | 35.96 ms | 35.52 ms | 0 | 557 | 338 | 0 |
| root | error | 3 | 17.22 ms | 17.05 ms | 0 ps | 0 | 0 | 0 | 0 |
| root | set_option | 88 | 8.02 ms | 1.63 ms | 0 ps | 0 | 0 | 0 | 0 |
| root | call_procedure | 2 | 2.98 ms | 2.29 ms | 95.00 us | 0 | 0 | 0 | 0 |
| root | Init DB | 22 | 1.07 ms | 117.65 us | 0 ps | 0 | 0 | 0 | 0 |
| root | show_status | 1 | 408.69 us | 408.69 us | 102.00 us | 23 | 23 | 0 | 1 |
+------+------------------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
host_summary / x$host_summary
Description
Summarizes statement activity, file IO and connections by host.
When the host found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from host_summary;
+------+------------+-------------------+-----------------------+-------------+----------+-----------------+---------------------+-------------------+--------------+
| host | statements | statement_latency | statement_avg_latency | table_scans | file_ios | file_io_latency | current_connections | total_connections | unique_users |
+------+------------+-------------------+-----------------------+-------------+----------+-----------------+---------------------+-------------------+--------------+
| hal1 | 2924 | 00:03:59.53 | 81.92 ms | 82 | 54702 | 55.61 s | 1 | 1 | 1 |
+------+------------+-------------------+-----------------------+-------------+----------+-----------------+---------------------+-------------------+--------------+
host_summary_by_file_io / x$host_summary_by_file_io
Description
Summarizes file IO totals per host.
When the host found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from host_summary_by_file_io;
+------------+-------+------------+
| host | ios | io_latency |
+------------+-------+------------+
| hal1 | 26457 | 21.58 s |
| hal2 | 1189 | 394.21 ms |
+------------+-------+------------+
host_summary_by_file_io_type / x$host_summary_by_file_io_type
Description
Summarizes file IO by event type per host.
When the host found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from host_summary_by_file_io_type;
+------------+--------------------------------------+-------+---------------+-------------+
| host | event_name | total | total_latency | max_latency |
+------------+--------------------------------------+-------+---------------+-------------+
| hal1 | wait/io/file/sql/FRM | 871 | 168.15 ms | 18.48 ms |
| hal1 | wait/io/file/innodb/innodb_data_file | 173 | 129.56 ms | 34.09 ms |
| hal1 | wait/io/file/innodb/innodb_log_file | 20 | 77.53 ms | 60.66 ms |
| hal1 | wait/io/file/myisam/dfile | 40 | 6.54 ms | 4.58 ms |
| hal1 | wait/io/file/mysys/charset | 3 | 4.79 ms | 4.71 ms |
| hal1 | wait/io/file/myisam/kfile | 67 | 4.38 ms | 300.04 us |
| hal1 | wait/io/file/sql/ERRMSG | 5 | 2.72 ms | 1.69 ms |
| hal1 | wait/io/file/sql/pid | 3 | 266.30 us | 185.47 us |
| hal1 | wait/io/file/sql/casetest | 5 | 246.81 us | 150.19 us |
| hal1 | wait/io/file/sql/global_ddl_log | 2 | 21.24 us | 18.59 us |
| hal2 | wait/io/file/sql/file_parser | 1422 | 4.80 s | 135.14 ms |
| hal2 | wait/io/file/sql/FRM | 865 | 85.82 ms | 9.81 ms |
| hal2 | wait/io/file/myisam/kfile | 1073 | 37.14 ms | 15.79 ms |
| hal2 | wait/io/file/myisam/dfile | 2991 | 25.53 ms | 5.25 ms |
| hal2 | wait/io/file/sql/dbopt | 20 | 1.07 ms | 153.07 us |
| hal2 | wait/io/file/sql/misc | 4 | 59.71 us | 33.75 us |
| hal2 | wait/io/file/archive/data | 1 | 13.91 us | 13.91 us |
+------------+--------------------------------------+-------+---------------+-------------+
host_summary_by_stages / x$host_summary_by_stages
Description
Summarizes stages by host, ordered by host and total latency per stage.
When the host found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from host_summary_by_stages;
+------+--------------------------------+-------+---------------+-------------+
| host | event_name | total | total_latency | avg_latency |
+------+--------------------------------+-------+---------------+-------------+
| hal | stage/sql/Opening tables | 889 | 1.97 ms | 2.22 us |
| hal | stage/sql/Creating sort index | 4 | 1.79 ms | 446.30 us |
| hal | stage/sql/init | 10 | 312.27 us | 31.23 us |
| hal | stage/sql/checking permissions | 10 | 300.62 us | 30.06 us |
| hal | stage/sql/freeing items | 5 | 85.89 us | 17.18 us |
| hal | stage/sql/statistics | 5 | 79.15 us | 15.83 us |
| hal | stage/sql/preparing | 5 | 69.12 us | 13.82 us |
| hal | stage/sql/optimizing | 5 | 53.11 us | 10.62 us |
| hal | stage/sql/Sending data | 5 | 44.66 us | 8.93 us |
| hal | stage/sql/closing tables | 5 | 37.54 us | 7.51 us |
| hal | stage/sql/System lock | 5 | 34.28 us | 6.86 us |
| hal | stage/sql/query end | 5 | 24.37 us | 4.87 us |
| hal | stage/sql/end | 5 | 8.60 us | 1.72 us |
| hal | stage/sql/Sorting result | 5 | 8.33 us | 1.67 us |
| hal | stage/sql/executing | 5 | 5.37 us | 1.07 us |
| hal | stage/sql/cleaning up | 5 | 4.60 us | 919.00 ns |
+------+--------------------------------+-------+---------------+-------------+
host_summary_by_statement_latency / x$host_summary_by_statement_latency
Description
Summarizes overall statement statistics by host.
When the host found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from host_summary_by_statement_latency;
+------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| host | total | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans |
+------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| hal | 3381 | 00:02:09.13 | 1.48 s | 1.07 s | 1151 | 93947 | 150 | 91 |
+------+-------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
host_summary_by_statement_type / x$host_summary_by_statement_type
Description
Summarizes the types of statements executed by each host.
When the host found is NULL, it is assumed to be a "background" thread.
Example
mysql> select * from host_summary_by_statement_type;
+------+----------------------+--------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| host | statement | total | total_latency | max_latency | lock_latency | rows_sent | rows_examined | rows_affected | full_scans |
+------+----------------------+--------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
| hal | create_view | 2063 | 00:05:04.20 | 463.58 ms | 1.42 s | 0 | 0 | 0 | 0 |
| hal | select | 174 | 40.87 s | 28.83 s | 858.13 ms | 5212 | 157022 | 0 | 82 |
| hal | stmt | 6645 | 15.31 s | 491.78 ms | 0 ps | 0 | 0 | 7951 | 0 |
| hal | call_procedure | 17 | 4.78 s | 1.02 s | 37.94 ms | 0 | 0 | 19 | 0 |
| hal | create_table | 19 | 3.04 s | 431.71 ms | 0 ps | 0 | 0 | 0 | 0 |
...
+------+----------------------+--------+---------------+-------------+--------------+-----------+---------------+---------------+------------+
wait_classes_global_by_avg_latency / x$wait_classes_global_by_avg_latency
Description
Lists the top wait classes by average latency, ignoring idle (this may be very large).
Example
mysql> select * from wait_classes_global_by_avg_latency where event_class != 'idle';
+-------------------+--------+---------------+-------------+-------------+-------------+
| event_class | total | total_latency | min_latency | avg_latency | max_latency |
+-------------------+--------+---------------+-------------+-------------+-------------+
| wait/io/file | 543123 | 44.60 s | 19.44 ns | 82.11 µs | 4.21 s |
| wait/io/table | 22002 | 766.60 ms | 148.72 ns | 34.84 µs | 44.97 ms |
| wait/io/socket | 79613 | 967.17 ms | 0 ps | 12.15 µs | 27.10 ms |
| wait/lock/table | 35409 | 18.68 ms | 65.45 ns | 527.51 ns | 969.88 µs |
| wait/synch/rwlock | 37935 | 4.61 ms | 21.38 ns | 121.61 ns | 34.65 µs |
| wait/synch/mutex | 390622 | 18.60 ms | 19.44 ns | 47.61 ns | 10.32 µs |
+-------------------+--------+---------------+-------------+-------------+-------------+
wait_classes_global_by_latency / x$wait_classes_global_by_latency
Description
Lists the top wait classes by total latency, ignoring idle (this may be very large).
Example
mysql> select * from wait_classes_global_by_latency;
+-------------------+--------+---------------+-------------+-------------+-------------+
| event_class | total | total_latency | min_latency | avg_latency | max_latency |
+-------------------+--------+---------------+-------------+-------------+-------------+
| wait/io/file | 550470 | 46.01 s | 19.44 ns | 83.58 µs | 4.21 s |
| wait/io/socket | 228833 | 2.71 s | 0 ps | 11.86 µs | 29.93 ms |
| wait/io/table | 64063 | 1.89 s | 99.79 ns | 29.43 µs | 68.07 ms |
| wait/lock/table | 76029 | 47.19 ms | 65.45 ns | 620.74 ns | 969.88 µs |
| wait/synch/mutex | 635925 | 34.93 ms | 19.44 ns | 54.93 ns | 107.70 µs |
| wait/synch/rwlock | 61287 | 7.62 ms | 21.38 ns | 124.37 ns | 34.65 µs |
+-------------------+--------+---------------+-------------+-------------+-------------+
waits_by_user_by_latency / x$waits_by_user_by_latency
Description
Lists the top wait events per user by their total latency, ignoring idle (this may be very large) per user.
Example
mysql> select * from waits_by_user_by_latency;
+------+-----------------------------------------------------+--------+---------------+-------------+-------------+
| user | event | total | total_latency | avg_latency | max_latency |
+------+-----------------------------------------------------+--------+---------------+-------------+-------------+
| root | wait/io/file/sql/file_parser | 13743 | 00:01:00.46 | 4.40 ms | 231.88 ms |
| root | wait/io/file/innodb/innodb_data_file | 4699 | 3.02 s | 643.38 us | 46.93 ms |
| root | wait/io/file/sql/FRM | 11462 | 2.60 s | 226.83 us | 61.72 ms |
| root | wait/io/file/myisam/dfile | 26776 | 746.70 ms | 27.89 us | 308.79 ms |
| root | wait/io/file/myisam/kfile | 7126 | 462.66 ms | 64.93 us | 88.76 ms |
| root | wait/io/file/sql/dbopt | 179 | 137.58 ms | 768.59 us | 15.46 ms |
| root | wait/io/file/csv/metadata | 8 | 86.60 ms | 10.82 ms | 50.32 ms |
| root | wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 798080 | 66.46 ms | 82.94 ns | 161.03 us |
| root | wait/io/file/sql/binlog | 19 | 49.11 ms | 2.58 ms | 9.40 ms |
| root | wait/io/file/sql/misc | 26 | 22.38 ms | 860.80 us | 15.30 ms |
| root | wait/io/file/csv/data | 4 | 297.46 us | 74.37 us | 111.93 us |
| root | wait/synch/rwlock/sql/MDL_lock::rwlock | 944 | 287.86 us | 304.62 ns | 874.64 ns |
| root | wait/io/file/archive/data | 4 | 82.71 us | 20.68 us | 40.74 us |
| root | wait/synch/mutex/myisam/MYISAM_SHARE::intern_lock | 60 | 12.21 us | 203.20 ns | 512.72 ns |
| root | wait/synch/mutex/innodb/trx_mutex | 81 | 5.93 us | 73.14 ns | 252.59 ns |
+------+-----------------------------------------------------+--------+---------------+-------------+-------------+
waits_by_host_by_latency / x$waits_by_host_by_latency
Description
Lists the top wait events per host by their total latency, ignoring idle (this may be very large) per host.
Example
mysql> select * from waits_by_host_by_latency;
+------+-----------------------------------------------------+--------+---------------+-------------+-------------+
| host | event | total | total_latency | avg_latency | max_latency |
+------+-----------------------------------------------------+--------+---------------+-------------+-------------+
| hal1 | wait/io/file/sql/file_parser | 13743 | 00:01:00.46 | 4.40 ms | 231.88 ms |
| hal1 | wait/io/file/innodb/innodb_data_file | 4699 | 3.02 s | 643.38 us | 46.93 ms |
| hal1 | wait/io/file/sql/FRM | 11462 | 2.60 s | 226.83 us | 61.72 ms |
| hal1 | wait/io/file/myisam/dfile | 26776 | 746.70 ms | 27.89 us | 308.79 ms |
| hal1 | wait/io/file/myisam/kfile | 7126 | 462.66 ms | 64.93 us | 88.76 ms |
| hal1 | wait/io/file/sql/dbopt | 179 | 137.58 ms | 768.59 us | 15.46 ms |
| hal1 | wait/io/file/csv/metadata | 8 | 86.60 ms | 10.82 ms | 50.32 ms |
| hal1 | wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 798080 | 66.46 ms | 82.94 ns | 161.03 us |
| hal1 | wait/io/file/sql/binlog | 19 | 49.11 ms | 2.58 ms | 9.40 ms |
| hal1 | wait/io/file/sql/misc | 26 | 22.38 ms | 860.80 us | 15.30 ms |
| hal1 | wait/io/file/csv/data | 4 | 297.46 us | 74.37 us | 111.93 us |
| hal1 | wait/synch/rwlock/sql/MDL_lock::rwlock | 944 | 287.86 us | 304.62 ns | 874.64 ns |
| hal1 | wait/io/file/archive/data | 4 | 82.71 us | 20.68 us | 40.74 us |
| hal1 | wait/synch/mutex/myisam/MYISAM_SHARE::intern_lock | 60 | 12.21 us | 203.20 ns | 512.72 ns |
| hal1 | wait/synch/mutex/innodb/trx_mutex | 81 | 5.93 us | 73.14 ns | 252.59 ns |
+------+-----------------------------------------------------+--------+---------------+-------------+-------------+
waits_global_by_latency / x$waits_global_by_latency
Description
Lists the top wait events by their total latency, ignoring idle (this may be very large).
Example
mysql> select * from waits_global_by_latency;
+-----------------------------------------------------+---------+---------------+-------------+-------------+
| events | total | total_latency | avg_latency | max_latency |
+-----------------------------------------------------+---------+---------------+-------------+-------------+
| wait/io/file/sql/file_parser | 14936 | 00:01:06.64 | 4.46 ms | 231.88 ms |
| wait/io/file/innodb/innodb_data_file | 6133 | 6.31 s | 1.03 ms | 147.56 ms |
| wait/io/file/sql/FRM | 12677 | 2.83 s | 223.37 us | 40.86 ms |
| wait/io/file/myisam/dfile | 28446 | 754.40 ms | 26.52 us | 308.79 ms |
| wait/io/file/myisam/kfile | 7572 | 491.17 ms | 64.87 us | 88.76 ms |
| wait/io/file/sql/relaylog | 9 | 252.28 ms | 28.03 ms | 144.17 ms |
| wait/io/file/sql/binlog | 76 | 242.87 ms | 3.20 ms | 153.72 ms |
| wait/io/file/sql/binlog_index | 21 | 173.07 ms | 8.24 ms | 81.83 ms |
| wait/io/file/sql/dbopt | 184 | 149.52 ms | 812.62 us | 15.46 ms |
| wait/io/file/innodb/innodb_log_file | 20 | 117.17 ms | 5.86 ms | 36.53 ms |
| wait/synch/mutex/mysys/IO_CACHE::append_buffer_lock | 1197128 | 99.27 ms | 82.56 ns | 161.03 us |
| wait/io/file/csv/metadata | 8 | 86.60 ms | 10.82 ms | 50.32 ms |
| wait/io/file/sql/relaylog_index | 10 | 60.10 ms | 6.01 ms | 48.04 ms |
| wait/io/file/sql/ERRMSG | 5 | 35.41 ms | 7.08 ms | 31.78 ms |
| wait/io/file/sql/misc | 28 | 22.40 ms | 800.06 us | 15.30 ms |
| wait/io/file/mysys/charset | 3 | 7.46 ms | 2.49 ms | 4.13 ms |
| wait/io/file/sql/casetest | 5 | 6.01 ms | 1.20 ms | 5.86 ms |
| wait/io/file/sql/pid | 3 | 5.96 ms | 1.99 ms | 3.06 ms |
| wait/synch/rwlock/sql/MDL_lock::rwlock | 1396 | 420.58 us | 301.22 ns | 874.64 ns |
| wait/io/file/csv/data | 4 | 297.46 us | 74.37 us | 111.93 us |
| wait/io/file/mysys/cnf | 5 | 154.97 us | 30.99 us | 58.87 us |
| wait/io/file/archive/data | 4 | 82.71 us | 20.68 us | 40.74 us |
| wait/synch/mutex/myisam/MYISAM_SHARE::intern_lock | 90 | 19.23 us | 213.38 ns | 576.81 ns |
| wait/io/file/sql/global_ddl_log | 2 | 18.64 us | 9.32 us | 16.40 us |
| wait/synch/mutex/innodb/trx_mutex | 108 | 8.23 us | 76.15 ns | 365.69 ns |
+-----------------------------------------------------+---------+---------------+-------------+-------------+
Functions
extract_schema_from_file_name
Description
Takes a raw file path, and attempts to extract the schema name from it.
Useful for when interacting with Performance Schema data concerning IO statistics, for example.
Currently relies on the fact that a table data file will be within a specified database directory (will not work with partitions or tables that specify an individual DATA_DIRECTORY).
Parameters
- path (VARCHAR(512)): The full file path to a data file to extract the schema name from.
Returns
VARCHAR(64)
Example
mysql> SELECT sys.extract_schema_from_file_name('/var/lib/mysql/employees/employee.ibd');
+----------------------------------------------------------------------------+
| sys.extract_schema_from_file_name('/var/lib/mysql/employees/employee.ibd') |
+----------------------------------------------------------------------------+
| employees |
+----------------------------------------------------------------------------+
1 row in set (0.00 sec)
extract_table_from_file_name
Description
Takes a raw file path, and extracts the table name from it.
Useful for when interacting with Performance Schema data concerning IO statistics, for example.
Parameters
- path (VARCHAR(512)): The full file path to a data file to extract the table name from.
Returns
VARCHAR(64)
Example
mysql> SELECT sys.extract_table_from_file_name('/var/lib/mysql/employees/employee.ibd');
+---------------------------------------------------------------------------+
| sys.extract_table_from_file_name('/var/lib/mysql/employees/employee.ibd') |
+---------------------------------------------------------------------------+
| employee |
+---------------------------------------------------------------------------+
1 row in set (0.02 sec)
#### format_bytes
Description
Takes a raw bytes value, and converts it to a human readable format.
Parameters
- bytes (BIGINT): A raw bytes value.
Returns
VARCHAR(16)
Example
mysql> SELECT sys.format_bytes(2348723492723746) AS size;
+----------+
| size |
+----------+
| 2.09 PiB |
+----------+
1 row in set (0.00 sec)
mysql> SELECT sys.format_bytes(2348723492723) AS size;
+----------+
| size |
+----------+
| 2.14 TiB |
+----------+
1 row in set (0.00 sec)
mysql> SELECT sys.format_bytes(23487234) AS size;
+-----------+
| size |
+-----------+
| 22.40 MiB |
+-----------+
1 row in set (0.00 sec)
format_path
Description
Takes a raw path value, and strips out the datadir or tmpdir replacing with @@datadir and @@tmpdir respectively.
Also normalizes the paths across operating systems, so backslashes on Windows are converted to forward slashes.
Parameters
- path (VARCHAR(260)): The raw file path value to format.
Returns
VARCHAR(260) CHARSET UTF8
Example
mysql> select @@datadir;
+-----------------------------------------------+
| @@datadir |
+-----------------------------------------------+
| /Users/mark/sandboxes/SmallTree/AMaster/data/ |
+-----------------------------------------------+
1 row in set (0.06 sec)
mysql> select format_path('/Users/mark/sandboxes/SmallTree/AMaster/data/mysql/proc.MYD') AS path;
+--------------------------+
| path |
+--------------------------+
| @@datadir/mysql/proc.MYD |
+--------------------------+
1 row in set (0.03 sec)
format_statement
Description
Formats a normalized statement, truncating it if it's > 64 characters long by default.
To configure the length to truncate the statement to by default, update the statement_truncate_len
variable with sys_config
table to a different value. Alternatively, to change it just for just your particular session, use SET @statement_truncate_len := <some new value>
.
Useful for printing statement related data from Performance Schema from the command line.
Parameters
- statement (LONGTEXT): The statement to format.
Returns
VARCHAR(65)
Example
mysql> SELECT sys.format_statement(digest_text)
-> FROM performance_schema.events_statements_summary_by_digest
-> ORDER by sum_timer_wait DESC limit 5;
+-------------------------------------------------------------------+
| sys.format_statement(digest_text) |
+-------------------------------------------------------------------+
| CREATE SQL SECURITY INVOKER VI ... KE ? AND `variable_value` > ? |
| CREATE SQL SECURITY INVOKER VI ... ait` IS NOT NULL , `esc` . ... |
| CREATE SQL SECURITY INVOKER VI ... ait` IS NOT NULL , `sys` . ... |
| CREATE SQL SECURITY INVOKER VI ... , `compressed_size` ) ) DESC |
| CREATE SQL SECURITY INVOKER VI ... LIKE ? ORDER BY `timer_start` |
+-------------------------------------------------------------------+
5 rows in set (0.00 sec)
format_time
Description
Takes a raw picoseconds value, and converts it to a human readable form.
Picoseconds are the precision that all latency values are printed in within Performance Schema, however are not user friendly when wanting to scan output from the command line.
Parameters
- picoseconds (BIGINT UNSIGNED): The raw picoseconds value to convert.
Returns
VARCHAR(16) CHARSET UTF8
Example
mysql> select format_time(342342342342345);
+------------------------------+
| format_time(342342342342345) |
+------------------------------+
| 00:05:42 |
+------------------------------+
1 row in set (0.00 sec)
mysql> select format_time(342342342);
+------------------------+
| format_time(342342342) |
+------------------------+
| 342.34 µs |
+------------------------+
1 row in set (0.00 sec)
mysql> select format_time(34234);
+--------------------+
| format_time(34234) |
+--------------------+
| 34.23 ns |
+--------------------+
1 row in set (0.00 sec)
ps_is_account_enabled
Description
Determines whether instrumentation of an account is enabled within Performance Schema.
Parameters
- in_host VARCHAR(60): The hostname of the account to check.
- in_user (VARCHAR(16)): The username of the account to check.
Returns
ENUM('YES', 'NO', 'PARTIAL')
Example
mysql> SELECT sys.ps_is_account_enabled('localhost', 'root');
+------------------------------------------------+
| sys.ps_is_account_enabled('localhost', 'root') |
+------------------------------------------------+
| YES |
+------------------------------------------------+
1 row in set (0.01 sec)
ps_is_instrument_default_enabled
Description
Returns whether an instrument is enabled by default in this version of MySQL.
Parameters
- in_instrument VARCHAR(128): The instrument to check.
Returns
ENUM('YES', 'NO')
Example
mysql> SELECT sys.ps_is_instrument_default_enabled('statement/sql/select');
+--------------------------------------------------------------+
| sys.ps_is_instrument_default_enabled('statement/sql/select') |
+--------------------------------------------------------------+
| YES |
+--------------------------------------------------------------+
1 row in set (0.00 sec)
ps_is_instrument_default_timed
Description
Returns whether an instrument is timed by default in this version of MySQL.
Parameters
- in_instrument VARCHAR(128): The instrument to check.
Returns
ENUM('YES', 'NO')
Example
mysql> SELECT sys.ps_is_instrument_default_timed('statement/sql/select');
+------------------------------------------------------------+
| sys.ps_is_instrument_default_timed('statement/sql/select') |
+------------------------------------------------------------+
| YES |
+------------------------------------------------------------+
1 row in set (0.00 sec)
ps_thread_id
Description
Return the Performance Schema THREAD_ID for the specified connection ID.
Parameters
- in_connection_id (BIGINT UNSIGNED): The id of the connection to return the thread id for.
Returns
BIGINT UNSIGNED
Example
mysql> SELECT sys.ps_thread_id(79);
+----------------------+
| sys.ps_thread_id(79) |
+----------------------+
| 98 |
+----------------------+
1 row in set (0.00 sec)
mysql> SELECT sys.ps_thread_id(CONNECTION_ID());
+-----------------------------------+
| sys.ps_thread_id(CONNECTION_ID()) |
+-----------------------------------+
| 98 |
+-----------------------------------+
1 row in set (0.00 sec)
ps_thread_stack
Description
Outputs a JSON formatted stack of all statements, stages and events within Performance Schema for the specified thread.
Parameters
- thd_id (BIGINT): The id of the thread to trace. This should match the thread_id column from the performance_schema.threads table.
Example
(line separation added for output)
mysql> SELECT sys.ps_thread_stack(37, FALSE) AS thread_stack\G
*************************** 1. row ***************************
thread_stack: {"rankdir": "LR","nodesep": "0.10","stack_created": "2014-02-19 13:39:03",
"mysql_version": "5.7.3-m13","mysql_user": "root@localhost","events":
[{"nesting_event_id": "0", "event_id": "10", "timer_wait": 256.35, "event_info":
"sql/select", "wait_info": "select @@version_comment limit 1\nerrors: 0\nwarnings: 0\nlock time:
...
Procedures
create_synonym_db
Description
Takes a source database name and synonym name, and then creates the synonym database with views that point to all of the tables within the source database.
Useful for creating a "ps" synonym for "performance_schema", or "is" instead of "information_schema", for example.
Parameters
- in_db_name (VARCHAR(64)): ** The database name that you would like to create a synonym for.
- in_synonym (VARCHAR(64)): ** The database synonym name.
Example
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql> CALL sys.create_synonym_db('performance_schema', 'ps');
+-------------------------------------+
| summary |
+-------------------------------------+
| Created 74 views in the ps database |
+-------------------------------------+
1 row in set (8.57 sec)
Query OK, 0 rows affected (8.57 sec)
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| ps |
| sys |
| test |
+--------------------+
6 rows in set (0.00 sec)
mysql> SHOW FULL TABLES FROM ps;
+-----------------------------------------+------------+
| Tables_in_ps | Table_type |
+-----------------------------------------+------------+
| accounts | VIEW |
| cond_instances | VIEW |
| events_stages_current | VIEW |
| events_stages_history | VIEW |
...
ps_setup_disable_background_threads
Description
Disable all background thread instrumentation within Performance Schema.
Parameters
None.
Example
mysql> CALL sys.ps_setup_disable_background_threads();
+--------------------------------+
| summary |
+--------------------------------+
| Disabled 18 background threads |
+--------------------------------+
1 row in set (0.00 sec)
ps_setup_disable_instrument
Description
Disables instruments within Performance Schema matching the input pattern.
Parameters
- in_pattern (VARCHAR(128)): A LIKE pattern match (using "%in_pattern%") of events to disable
Example
To disable all mutex instruments:
mysql> CALL sys.ps_setup_disable_instrument('wait/synch/mutex');
+--------------------------+
| summary |
+--------------------------+
| Disabled 155 instruments |
+--------------------------+
1 row in set (0.02 sec)
To disable just a the scpecific TCP/IP based network IO instrument:
mysql> CALL sys.ps_setup_disable_instrument('wait/io/socket/sql/server_tcpip_socket');
+------------------------+
| summary |
+------------------------+
| Disabled 1 instruments |
+------------------------+
1 row in set (0.00 sec)
To enable all instruments:
mysql> CALL sys.ps_setup_disable_instrument('');
+--------------------------+
| summary |
+--------------------------+
| Disabled 547 instruments |
+--------------------------+
1 row in set (0.01 sec)
ps_setup_disable_consumers
Description
Disables consumers within Performance Schema matching the input pattern.
Parameters
- consumer (VARCHAR(128)): A LIKE pattern match (using "%consumer%") of consumers to disable
Example
To disable all consumers:
mysql> CALL sys.ps_setup_disable_consumers('');
+--------------------------+
| summary |
+--------------------------+
| Disabled 15 consumers |
+--------------------------+
1 row in set (0.02 sec)
To disable just the event_stage consumers:
mysql> CALL sys.ps_setup_disable_consumers('stage');
+------------------------+
| summary |
+------------------------+
| Disabled 3 consumers |
+------------------------+
1 row in set (0.00 sec)
ps_setup_disable_thread
Description
Disable the given connection/thread in Performance Schema.
Parameters
- in_connection_id (BIGINT): The connection ID (PROCESSLIST_ID from performance_schema.threads or the ID shown within SHOW PROCESSLIST)
Example
mysql> CALL sys.ps_setup_disable_thread(3);
+-------------------+
| summary |
+-------------------+
| Disabled 1 thread |
+-------------------+
1 row in set (0.01 sec)
To disable the current connection:
mysql> CALL sys.ps_setup_disable_thread(CONNECTION_ID());
+-------------------+
| summary |
+-------------------+
| Disabled 1 thread |
+-------------------+
1 row in set (0.00 sec)
ps_setup_enable_background_threads
Description
Enable all background thread instrumentation within Performance Schema.
Parameters
None.
Example
mysql> CALL sys.ps_setup_enable_background_threads();
+-------------------------------+
| summary |
+-------------------------------+
| Enabled 18 background threads |
+-------------------------------+
1 row in set (0.00 sec)
ps_setup_enable_consumers
Description
Enables consumers within Performance Schema matching the input pattern.
Parameters
- consumer (VARCHAR(128)): A LIKE pattern match (using "%consumer%") of consumers to enable
Example
To enable all consumers:
mysql> CALL sys.ps_setup_enable_consumers('');
+-------------------------+
| summary |
+-------------------------+
| Enabled 10 consumers |
+-------------------------+
1 row in set (0.02 sec)
To enable just "waits" consumers:
mysql> CALL sys.ps_setup_enable_consumers('waits');
+-----------------------+
| summary |
+-----------------------+
| Enabled 3 consumers |
+-----------------------+
1 row in set (0.00 sec)
ps_setup_enable_instrument
Description
Enables instruments within Performance Schema matching the input pattern.
Parameters
- in_pattern (VARCHAR(128)): A LIKE pattern match (using "%in_pattern%") of events to enable
Example
To enable all mutex instruments:
mysql> CALL sys.ps_setup_enable_instrument('wait/synch/mutex');
+-------------------------+
| summary |
+-------------------------+
| Enabled 155 instruments |
+-------------------------+
1 row in set (0.02 sec)
To enable just a the scpecific TCP/IP based network IO instrument:
mysql> CALL sys.ps_setup_enable_instrument('wait/io/socket/sql/server_tcpip_socket');
+-----------------------+
| summary |
+-----------------------+
| Enabled 1 instruments |
+-----------------------+
1 row in set (0.00 sec)
To enable all instruments:
mysql> CALL sys.ps_setup_enable_instrument('');
+-------------------------+
| summary |
+-------------------------+
| Enabled 547 instruments |
+-------------------------+
1 row in set (0.01 sec)
ps_setup_enable_thread
Description
Enable the given connection/thread in Performance Schema.
Parameters
- in_connection_id (BIGINT): The connection ID (PROCESSLIST_ID from performance_schema.threads or the ID shown within SHOW PROCESSLIST)
Example
mysql> CALL sys.ps_setup_enable_thread(3);
+------------------+
| summary |
+------------------+
| Enabled 1 thread |
+------------------+
1 row in set (0.01 sec)
To enable the current connection:
mysql> CALL sys.ps_setup_enable_thread(CONNECTION_ID());
+------------------+
| summary |
+------------------+
| Enabled 1 thread |
+------------------+
1 row in set (0.00 sec)
ps_setup_reload_saved
Description
Reloads a saved Performance Schema configuration, so that you can alter the setup for debugging purposes, but restore it to a previous state.
Use the companion procedure - ps_setup_save(), to save a configuration.
Requires the SUPER privilege for "SET sql_log_bin = 0;".
Parameters
None.
Example
mysql> CALL sys.ps_setup_save();
Query OK, 0 rows affected (0.08 sec)
mysql> UPDATE performance_schema.setup_instruments SET enabled = 'YES', timed = 'YES';
Query OK, 547 rows affected (0.40 sec)
Rows matched: 784 Changed: 547 Warnings: 0
/* Run some tests that need more detailed instrumentation here */
mysql> CALL sys.ps_setup_reload_saved();
Query OK, 0 rows affected (0.32 sec)
ps_setup_reset_to_default
Description
Resets the Performance Schema setup to the default settings.
Parameters
- in_verbose (BOOLEAN): Whether to print each setup stage (including the SQL) whilst running.
Example
mysql> CALL sys.ps_setup_reset_to_default(true)\G
*************************** 1. row ***************************
status: Resetting: setup_actors
DELETE
FROM performance_schema.setup_actors
WHERE NOT (HOST = '%' AND USER = '%' AND ROLE = '%')
1 row in set (0.00 sec)
*************************** 1. row ***************************
status: Resetting: setup_actors
INSERT IGNORE INTO performance_schema.setup_actors
VALUES ('%', '%', '%')
1 row in set (0.00 sec)
...
mysql> CALL sys.ps_setup_reset_to_default(false)G
Query OK, 0 rows affected (0.00 sec)
ps_setup_save
Description
Saves the current configuration of Performance Schema, so that you can alter the setup for debugging purposes, but restore it to a previous state.
Use the companion procedure - ps_setup_reload_saved(), to restore the saved config.
Requires the SUPER privilege for "SET sql_log_bin = 0;".
Parameters
None.
Example
mysql> CALL sys.ps_setup_save();
Query OK, 0 rows affected (0.08 sec)
mysql> UPDATE performance_schema.setup_instruments
-> SET enabled = 'YES', timed = 'YES';
Query OK, 547 rows affected (0.40 sec)
Rows matched: 784 Changed: 547 Warnings: 0
/* Run some tests that need more detailed instrumentation here */
mysql> CALL sys.ps_setup_reload_saved();
Query OK, 0 rows affected (0.32 sec)
ps_setup_show_disabled
Description
Shows all currently disable Performance Schema configuration.
Parameters
- in_in_show_instruments (BOOLEAN): Whether to print disabled instruments (can print many items)
- in_in_show_threads (BOOLEAN): Whether to print disabled threads
Example
mysql> CALL sys.ps_setup_show_disabled(TRUE, TRUE);
+----------------------------+
| performance_schema_enabled |
+----------------------------+
| 1 |
+----------------------------+
1 row in set (0.00 sec)
+--------------------+
| enabled_users |
+--------------------+
| 'mark'@'localhost' |
+--------------------+
1 row in set (0.00 sec)
+-------------+----------------------+---------+-------+
| object_type | objects | enabled | timed |
+-------------+----------------------+---------+-------+
| EVENT | mysql.% | NO | NO |
| EVENT | performance_schema.% | NO | NO |
| EVENT | information_schema.% | NO | NO |
| FUNCTION | mysql.% | NO | NO |
| FUNCTION | performance_schema.% | NO | NO |
| FUNCTION | information_schema.% | NO | NO |
| PROCEDURE | mysql.% | NO | NO |
| PROCEDURE | performance_schema.% | NO | NO |
| PROCEDURE | information_schema.% | NO | NO |
| TABLE | mysql.% | NO | NO |
| TABLE | performance_schema.% | NO | NO |
| TABLE | information_schema.% | NO | NO |
| TRIGGER | mysql.% | NO | NO |
| TRIGGER | performance_schema.% | NO | NO |
| TRIGGER | information_schema.% | NO | NO |
+-------------+----------------------+---------+-------+
15 rows in set (0.00 sec)
+----------------------------------+
| disabled_consumers |
+----------------------------------+
| events_stages_current |
| events_stages_history |
| events_stages_history_long |
| events_statements_history |
| events_statements_history_long |
| events_transactions_history |
| events_transactions_history_long |
| events_waits_current |
| events_waits_history |
| events_waits_history_long |
+----------------------------------+
10 rows in set (0.00 sec)
Empty set (0.00 sec)
+---------------------------------------------------------------------------------------+-------+
| disabled_instruments | timed |
+---------------------------------------------------------------------------------------+-------+
| wait/synch/mutex/sql/TC_LOG_MMAP::LOCK_tc | NO |
| wait/synch/mutex/sql/LOCK_des_key_file | NO |
| wait/synch/mutex/sql/MYSQL_BIN_LOG::LOCK_commit | NO |
...
| memory/sql/servers_cache | NO |
| memory/sql/udf_mem | NO |
| wait/lock/metadata/sql/mdl | NO |
+---------------------------------------------------------------------------------------+-------+
547 rows in set (0.00 sec)
Query OK, 0 rows affected (0.01 sec)
ps_setup_show_disabled_consumers
##### Description
Shows all currently disabled consumers.
##### Parameters
None
##### Example
mysql> CALL sys.ps_setup_show_disabled_consumers();
+---------------------------+
| disabled_consumers |
+---------------------------+
| events_statements_current |
| global_instrumentation |
| thread_instrumentation |
| statements_digest |
+---------------------------+
4 rows in set (0.05 sec)
ps_setup_show_disabled_instruments
Description
Shows all currently disabled instruments.
Parameters
None
Example
mysql> CALL sys.ps_setup_show_disabled_instruments();
ps_setup_show_enabled
Description
Shows all currently enabled Performance Schema configuration.
Parameters
- in_show_instruments (BOOLEAN): Whether to print enabled instruments (can print many items)
- in_show_threads (BOOLEAN): Whether to print enabled threads
Example
mysql> CALL sys.ps_setup_show_enabled(TRUE, TRUE);
+----------------------------+
| performance_schema_enabled |
+----------------------------+
| 1 |
+----------------------------+
1 row in set (0.00 sec)
+---------------+
| enabled_users |
+---------------+
| '%'@'%' |
+---------------+
1 row in set (0.01 sec)
+----------------------+---------+-------+
| objects | enabled | timed |
+----------------------+---------+-------+
| mysql.% | NO | NO |
| performance_schema.% | NO | NO |
| information_schema.% | NO | NO |
| %.% | YES | YES |
+----------------------+---------+-------+
4 rows in set (0.01 sec)
+---------------------------+
| enabled_consumers |
+---------------------------+
| events_statements_current |
| global_instrumentation |
| thread_instrumentation |
| statements_digest |
+---------------------------+
4 rows in set (0.05 sec)
+--------------------------+-------------+
| enabled_threads | thread_type |
+--------------------------+-------------+
| innodb/srv_master_thread | BACKGROUND |
| root@localhost | FOREGROUND |
| root@localhost | FOREGROUND |
| root@localhost | FOREGROUND |
| root@localhost | FOREGROUND |
+--------------------------+-------------+
5 rows in set (0.03 sec)
+-------------------------------------+-------+
| enabled_instruments | timed |
+-------------------------------------+-------+
| wait/io/file/sql/map | YES |
| wait/io/file/sql/binlog | YES |
...
| statement/com/Error | YES |
| statement/com/ | YES |
| idle | YES |
+-------------------------------------+-------+
210 rows in set (0.08 sec)
Query OK, 0 rows affected (0.89 sec)
ps_setup_show_enabled_consumers
Description
Shows all currently enabled consumers.
Parameters
None
Example
mysql> CALL sys.ps_setup_show_enabled_consumers();
+---------------------------+
| enabled_consumers |
+---------------------------+
| events_statements_current |
| global_instrumentation |
| thread_instrumentation |
| statements_digest |
+---------------------------+
4 rows in set (0.05 sec)
ps_setup_show_enabled_instruments
Description
Shows all currently enabled instruments.
Parameters
None
Example
mysql> CALL sys.ps_setup_show_enabled_instruments();
ps_statement_avg_latency_histogram
Description
Outputs a textual histogram graph of the average latency values across all normalized queries tracked within the Performance Schema events_statements_summary_by_digest table.
Can be used to show a very high level picture of what kind of latency distribution statements running within this instance have.
Parameters
None.
Example
mysql> CALL sys.ps_statement_avg_latency_histogram()G
*************************** 1. row ***************************
Performance Schema Statement Digest Average Latency Histogram:
. = 1 unit
* = 2 units
# = 3 units
(0 - 38ms) 240 | ################################################################################
(38 - 77ms) 38 | ......................................
(77 - 115ms) 3 | ...
(115 - 154ms) 62 | *******************************
(154 - 192ms) 3 | ...
(192 - 231ms) 0 |
(231 - 269ms) 0 |
(269 - 307ms) 0 |
(307 - 346ms) 0 |
(346 - 384ms) 1 | .
(384 - 423ms) 1 | .
(423 - 461ms) 0 |
(461 - 499ms) 0 |
(499 - 538ms) 0 |
(538 - 576ms) 0 |
(576 - 615ms) 1 | .
Total Statements: 350; Buckets: 16; Bucket Size: 38 ms;
ps_trace_statement_digest
Description
Traces all instrumentation within Performance Schema for a specific Statement Digest.
When finding a statement of interest within the performance_schema.events_statements_summary_by_digest table, feed the DIGEST MD5 value in to this procedure, set how long to poll for, and at what interval to poll, and it will generate a report of all statistics tracked within Performance Schema for that digest for the interval.
It will also attempt to generate an EXPLAIN for the longest running example of the digest during the interval.
Note this may fail, as Performance Schema truncates long SQL_TEXT values (and hence the EXPLAIN will fail due to parse errors).
Requires the SUPER privilege for "SET sql_log_bin = 0;".
Parameters
- in_digest VARCHAR(32): The statement digest identifier you would like to analyze
- in_runtime (INT): The number of seconds to run analysis for (defaults to a minute)
- in_interval (DECIMAL(2,2)): The interval (in seconds, may be fractional) at which to try and take snapshots (defaults to a second)
- in_start_fresh (BOOLEAN): Whether to TRUNCATE the events_statements_history_long and events_stages_history_long tables before starting (default false)
- in_auto_enable (BOOLEAN): Whether to automatically turn on required consumers (default false)
Example
mysql> call ps_analyze_statement_digest('891ec6860f98ba46d89dd20b0c03652c', 10, 0.1, true, true);
+--------------------+
| SUMMARY STATISTICS |
+--------------------+
| SUMMARY STATISTICS |
+--------------------+
1 row in set (9.11 sec)
+------------+-----------+-----------+-----------+---------------+------------+------------+
| executions | exec_time | lock_time | rows_sent | rows_examined | tmp_tables | full_scans |
+------------+-----------+-----------+-----------+---------------+------------+------------+
| 21 | 4.11 ms | 2.00 ms | 0 | 21 | 0 | 0 |
+------------+-----------+-----------+-----------+---------------+------------+------------+
1 row in set (9.11 sec)
+------------------------------------------+-------+-----------+
| event_name | count | latency |
+------------------------------------------+-------+-----------+
| stage/sql/checking query cache for query | 16 | 724.37 µs |
| stage/sql/statistics | 16 | 546.92 µs |
| stage/sql/freeing items | 18 | 520.11 µs |
| stage/sql/init | 51 | 466.80 µs |
...
| stage/sql/cleaning up | 18 | 11.92 µs |
| stage/sql/executing | 16 | 6.95 µs |
+------------------------------------------+-------+-----------+
17 rows in set (9.12 sec)
+---------------------------+
| LONGEST RUNNING STATEMENT |
+---------------------------+
| LONGEST RUNNING STATEMENT |
+---------------------------+
1 row in set (9.16 sec)
+-----------+-----------+-----------+-----------+---------------+------------+-----------+
| thread_id | exec_time | lock_time | rows_sent | rows_examined | tmp_tables | full_scan |
+-----------+-----------+-----------+-----------+---------------+------------+-----------+
| 166646 | 618.43 µs | 1.00 ms | 0 | 1 | 0 | 0 |
+-----------+-----------+-----------+-----------+---------------+------------+-----------+
1 row in set (9.16 sec)
// Truncated for clarity...
+-----------------------------------------------------------------+
| sql_text |
+-----------------------------------------------------------------+
| select hibeventhe0_.id as id1382_, hibeventhe0_.createdTime ... |
+-----------------------------------------------------------------+
1 row in set (9.17 sec)
+------------------------------------------+-----------+
| event_name | latency |
+------------------------------------------+-----------+
| stage/sql/init | 8.61 µs |
| stage/sql/Waiting for query cache lock | 453.23 µs |
| stage/sql/init | 331.07 ns |
| stage/sql/checking query cache for query | 43.04 µs |
...
| stage/sql/freeing items | 30.46 µs |
| stage/sql/cleaning up | 662.13 ns |
+------------------------------------------+-----------+
18 rows in set (9.23 sec)
+----+-------------+--------------+-------+---------------+-----------+---------+-------------+------+-------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+--------------+-------+---------------+-----------+---------+-------------+------+-------+
| 1 | SIMPLE | hibeventhe0_ | const | fixedTime | fixedTime | 775 | const,const | 1 | NULL |
+----+-------------+--------------+-------+---------------+-----------+---------+-------------+------+-------+
1 row in set (9.27 sec)
Query OK, 0 rows affected (9.28 sec)
ps_trace_thread
Description
Dumps all data within Performance Schema for an instrumented thread, to create a DOT formatted graph file.
Each resultset returned from the procedure should be used for a complete graph
Requires the SUPER privilege for "SET sql_log_bin = 0;".
Parameters
- in_thread_id (INT): The thread that you would like a stack trace for
- in_outfile (VARCHAR(255)): The filename the dot file will be written to
- in_max_runtime (DECIMAL(20,2)): The maximum time to keep collecting data. Use NULL to get the default which is 60 seconds.
- in_interval (DECIMAL(20,2)): How long to sleep between data collections. Use NULL to get the default which is 1 second.
- in_start_fresh (BOOLEAN): Whether to reset all Performance Schema data before tracing.
- in_auto_setup (BOOLEAN): Whether to disable all other threads and enable all consumers/instruments. This will also reset the settings at the end of the run.
- in_debug (BOOLEAN): Whether you would like to include file:lineno in the graph
Example
mysql> CALL sys.ps_dump_thread_stack(25, CONCAT('/tmp/stack-', REPLACE(NOW(), ' ', '-'), '.dot'), NULL, NULL, TRUE, TRUE, TRUE);
+-------------------+
| summary |
+-------------------+
| Disabled 1 thread |
+-------------------+
1 row in set (0.00 sec)
+---------------------------------------------+
| Info |
+---------------------------------------------+
| Data collection starting for THREAD_ID = 25 |
+---------------------------------------------+
1 row in set (0.03 sec)
+-----------------------------------------------------------+
| Info |
+-----------------------------------------------------------+
| Stack trace written to /tmp/stack-2014-02-16-21:18:41.dot |
+-----------------------------------------------------------+
1 row in set (60.07 sec)
+-------------------------------------------------------------------+
| Convert to PDF |
+-------------------------------------------------------------------+
| dot -Tpdf -o /tmp/stack_25.pdf /tmp/stack-2014-02-16-21:18:41.dot |
+-------------------------------------------------------------------+
1 row in set (60.07 sec)
+-------------------------------------------------------------------+
| Convert to PNG |
+-------------------------------------------------------------------+
| dot -Tpng -o /tmp/stack_25.png /tmp/stack-2014-02-16-21:18:41.dot |
+-------------------------------------------------------------------+
1 row in set (60.07 sec)
+------------------+
| summary |
+------------------+
| Enabled 1 thread |
+------------------+
1 row in set (60.32 sec)
ps_truncate_all_tables
Description
Truncates all summary tables within Performance Schema, resetting all aggregated instrumentation as a snapshot.
Parameters
- in_verbose (BOOLEAN): Whether to print each TRUNCATE statement before running
Example
mysql> CALL sys.ps_truncate_all_tables(false);
+---------------------+
| summary |
+---------------------+
| Truncated 44 tables |
+---------------------+
1 row in set (0.10 sec)