如果事件未执行完成,则TIMER_END为当前计时器时间值(当前时间),TIMER_WAIT为目前为止所经过的时间(TIMER_END - TIMER_START) 如果采集该事件的instruments配置项TIMED = NO,则不会收集事件的时间信息,TIMER_START,TIMER_END和TIMER_WAIT在这种情况下均记录为NULL SPINS:对于互斥量和自旋次数。如果该列值为NULL,则...
Cloud Studio代码运行 /*innodb 行锁等待脚本*/SELECTr.trx_mysql_thread_id waiting_thread,r.trx_query waiting_query,concat(timestampdiff(SECOND,r.trx_wait_started,CURRENT_TIMESTAMP()),'s')ASduration,b.trx_mysql_thread_id blocking_thread,t.processlist_command state,b.trx_query blocking_current_...
/*开启performance_schema相关监控项,需要提前开启performance_schema*/ UPDATE performance_schema.setup_instruments SET ENABLED = 'YES', TIMED = 'YES' where name = 'transaction'; UPDATE performance_schema.setup_consumers SET ENABLED = 'YES' where name like '%events_transactions%'; UPDATE performance_...
1.开启锁监控。 MySQL [cjc]> select * from performance_schema.setup_instruments where name like ‘%lock%’ limit 20; ±---±---±---+ | NAME | ENABLED | TIMED | ±---±---±---+ | wait/synch/mutex/sql/TC_LOG_MMAP::LOCK_tc | NO | NO | | wait/synch/mutex/sql/LOCK_des...
/*innodb 行锁等待脚本*/SELECT r.trx_mysql_thread_id waiting_thread,r.trx_query waiting_query,concat(timestampdiff(SECOND,r.trx_wait_started,CURRENT_TIMESTAMP()),'s') AS duration,b.trx_mysql_thread_id blocking_thread,t.processlist_command state,b.trx_query blocking_current_query,e.sql_tex...
SELECT r.trx_mysql_thread_id waiting_thread,r.trx_query waiting_query, concat(timestampdiff(SECOND,r.trx_wait_started,CURRENT_TIMESTAMP()),'s') AS duration, b.trx_mysql_thread_id blocking_thread,t.processlist_command state,b.trx_query blocking_current_query,e.sql_text blocking_last_query...
第4步与第5步之间,所有的访问该表的会话都处于“waiting for table flush”状态,唯有大查询结束后,等待状态才能解除。 主备切换场景 在生产环境中,为了容灾一般mysql服务都由主备库组成,当主库出现问题时,可以切换到备库运行,保证服务的高可用。在这个过程中有一点很重要,避免双写。因为导致切换的场景有很多,可能...
/*innodb 行锁等待脚本*/SELECT r.trx_mysql_thread_id waiting_thread,r.trx_query waiting_query,concat(timestampdiff(SECOND,r.trx_wait_started,CURRENT_TIMESTAMP()),'s') AS duration,b.trx_mysql_thread_id blocking_thread,t.processlist_command state,b.trx_query blocking_current_query,e.sql_tex...
2023-06-15 10:37:00 [AnalysisStatistics.analysisStatisticsLog-53] java.lang.Thread.State: TIMED_WAITING (on object monitor) 2023-06-15 10:37:00 [AnalysisStatistics.analysisStatisticsLog-53] at java.lang.Object.wait(Native Method) 2023-06-15 10:37:00 [AnalysisStatistics.analysisStatisticsLog-...
show processlist或select * from information_schema.processlist,查看结果集中STATE列是否有Waiting for table metadata lock显示,有则为产生了元数据锁等等。 [5.7.37-log]>select * from information_schema.processlist; +---+---+---+---+---+---+---+---+ | ID | USER | HOST | DB | COMMAND...