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https://anhanx.gitee.io/2021/08/21/mysql_mvcc/#more
MVCC,全称Multi-Version Concurrency Control,即多版本并发控制。MVCC的实现,通过保存数据在某个时间点的快照来实现的。这意味着一个事务无论运行多长时间,在同一个事务里能够看到数据一致的视图。
https://anhanx.gitee.io/2021/04/09/jvm_MaxTenuringThreshold_test/#more
-XX:MaxTenuringThreshold,该参数用于设置对象经历多少次minor gc 之后晋升到老年代的阈值。默认值是15。本次实验,通过代码模拟,查看gc 日志观察对象经历多少次minor gc 之后晋升到老年代的现象。
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