The questdb from b-xiang

What is QuestDB

QuestDB is a high performance open source SQL database for time series data.

It uses a column-oriented approach, heavy parallelized vectorized execution, SIMD instructions and a whole array of low-latency techniques. The whole code base is built from scratch, without dependencies and 100% free from garbage collection.

QuestDB implements SQL and augments it for time-series with native extensions. It exposes a PostgreSQL wire protocol, high-performance REST API and supports ingestion with InfluxDB Line Protocol. QuestDB uses a relational model with maintenance-free schemas. Relational and time-series joins make it easy to correlate data over time. Writes are durably committed to disk, meaning that the data is safe - yet instantly accessible.

QuestDB's documentation

Live demo

Query our demo dataset with 1.6 billion rows in milliseconds.

Web Console

The interactive console to import data (drag and drop) and start querying right away. Check our Web Console guide to get started:

Web Console guide

Performance figures

Raw figures

Number operations per second per thread. Writes are durable and written to disk.

Operation	64-bit double	32-bit int
Read	120 Million /s	240 Million /s
Write	240 Million /s	480 Million /s

On a CPU with 6 memory channels, QuestDB can scan through 117GB of data per second.

Queries

Execution time on a c5.metal instance using 16 of the 96 threads available.

Query	Runtime
`SELECT sum(double) FROM 1bn`	0.061 secs
`SELECT tag, sum(double) FROM 1bn`	0.179 secs
`SELECT tag, sum(double) FROM 1bn WHERE timestamp='2019'`	0.05 secs

Getting Started

The easiest way to get started is with Docker:

docker run -p 9000:9000 -p 8812:8812 questdb/questdb

You can more information about Docker usage on the dedicated page.

Alternative methods

Connecting to QuestDB

You can interact with QuestDB using:

Web Console listening on port 9000: localhost:9000
Postgres on port 8812
REST API on port 9000

Both the HTTP and PostgreSQL servers reference the database in <root_directory>/db.

You can connect to the Postgres server as follows. The default password is quest:

psql -h localhost -p 8812 -U admin -W -d qdb

Building from source

(a) Prerequisites

Java 11 64-bit
Maven 3
Node.js 12 / NPM 6

java --version
mvn --version
node --version

(b) Clone the Repository

git clone [email protected]:questdb/questdb.git

(c) Build the Code

Commands below will create JAR without assembling executable binaries nor building web console.

cd questdb
mvn clean package -DskipTests

To package web console with the jar use the following command:

mvn clean package -DskipTests -P build-web-console

To build executable binaries use the following command:

mvn clean package -DskipTests -P build-web-console,build-binaries

To run tests it is not required to have binaries built nor web console. There are over 4000 tests that should complete without 2-6 minutes depending on the system.

mvn clean test

To release to Maven Central use the following command that activates deploy profile. Ensure that your ~/.m2/settings.xml contains username/password for server central and gnupg is on hand to sign the artefacts.

mvn -pl !benchmarks clean deploy -DskipTests -P build-web-console,maven-central-release

(d) Run QuestDB

# Create a database root directory and run QuestDB
mkdir <root_directory>
java -p core/target/questdb-5.0.5-SNAPSHOT.jar -m io.questdb/io.questdb.ServerMain -d <root_directory>

Resources

Complete references are available in the Documentation.

Get started:

Develop:

Concepts:

Support / Contact

Slack Channel

Roadmap

Our roadmap is here

Contribution

Feel free to contribute to the project by forking the repository and submitting pull requests. Please make sure you have read our contributing guide.

Contributors ✨

Thanks to these wonderful people (emoji key):

_{clickingbuttons} 💻 🤔 📓	_ideoma 💻 📓 ⚠️	_tonytamwk 💻 📓	_sirinath 🤔	_{igor-suhorukov} 💻 🤔	_mick2004 💻 📦	_rawkode 💻 🚇
_solidnerd 💻 🚇	_solanav 💻 📖	_{shantanoo-desai} 📝 💡	_alexprut 💻 🚧	_lbowman 💻 ⚠️	_{chankeypathak} 📝	_{upsidedownsmile} 💻
_Nagriar 💻