Mysql Innodb 引擎状态后台线程

Question

我从 SHOW ENGINE INNODB STATUS

得到了这个输出

-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 2738330 1_second, 2738328 sleeps, 270109 10_second, 48276 background, 48238 flush
srv_master_thread log flush and writes: 2743704

这些术语是什么意思？这些数字的单位（秒或计数）是多少？

PS: 在 Google!

中找不到任何解释

Answer 1

您可以在 mysql（或 mariadb 或 percona）手册中轻松找到此信息

BACKGROUND THREAD

The srv_master_thread lines shows work done by the main background thread.

https://dev.mysql.com/doc/refman/5.5/en/innodb-standard-monitor.html

https://www.percona.com/doc/percona-server/LATEST/diagnostics/innodb_show_status.html

BACKGROUND THREAD
-----------------
srv_master_thread loops: 1 srv_active, 0 srv_shutdown, 11844 srv_idle
srv_master_thread log flush and writes: 11844

InnoDB has a master thread which performs background tasks depending on the server state, once per second. If the server is under workload, the master thread runs the following: performs background table drops; performs change buffer merge, adaptively; flushes the redo log to disk; evicts tables from the dictionary cache if needed to satisfy its size limit; makes a checkpoint. If the server is idle: performs background table drops, flushes and/or checkpoints the redo log if needed due to the checkpoint age; performs change buffer merge at full I/O capacity; evicts tables from the dictionary cache if needed; and makes a checkpoint.

Mysql Innodb 引擎状态后台线程

Mysql Innodb engine status BACKGROUND THREAD

mysql

innodb