mysql中怎么利用performance

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丸趣 TV 小编给大家分享一下 mysql 中怎么利用 performance_schema 进行故障诊断,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!

instrunments: 生产者,用于采集 mysql 中各种操作产生的事件信息,对应配置表中的配置项,我们可以称之为采集配置项。

consumers: 消费者,对应的消费者用于存储来自 instruments 采集的数据,对应配置表的配置项,我们可以称之为消费存储配置项。

启用所有等待事件的 instruments:

use performance_schema

update  setup_instruments set enabled= yes ,timed= yes where name like wait/%

select * from setup_instruments where name like wait/%

启用等待事件的 consumers

update setup_consumers set enabled= yes where name like %wait%

select * from setup_consumers where name like %wait%

实时统计当前等待事件:

create view sys.test_waits as select sum(timer_wait) as timer_wait ,sum(number_of_bytes) as number_of_bytes,event_name,operation from events_waits_current where event_name != idle group by event_name,operation;

select sys.format_time(timer_wait),sys.format_bytes(number_of_bytes),event_name,operation from sys.test_waits where sys.format_time(timer_wait) not regexp ns|us order by timer_wait desc;

select thread_id,event_name,sys.format_time(timer_wait),index_name,nesting_event_type,operation,number_of_bytes from events_waits_current where event_name != idle order by timer_wait desc;

找出谁持有全局读锁:

通过 performance_schema.metadata_locks  表来排查谁持有全局读锁,全局读锁在该表中通常记录着同一个会话的 object_type 为 global 和 commit、lock_type 都为 shared 的两把显式锁, LOCK_TYPE: INTENTION_EXCLUSIVE 意向排他锁

select * from performance_schema.metadata_locks where owner_thread_id!=sys.ps_thread_id(connection_id())\G;

找出 OWNER_THREAD_ID 为内部线程 id, 可以查询 threads 表找出对应会话 id:

select * from performance_schema.threads where THREAD_ID in (31,30)\G;

*************************** 1. row ***************************

         OBJECT_TYPE: GLOBAL

       OBJECT_SCHEMA: NULL

         OBJECT_NAME: NULL

OBJECT_INSTANCE_BEGIN: 140514110025712

           LOCK_TYPE: SHARED

       LOCK_DURATION: EXPLICIT

         LOCK_STATUS: GRANTED

             SOURCE: lock.cc:1110

     OWNER_THREAD_ID: 31 持有锁的内部线程 id 为 31

     OWNER_EVENT_ID: 43

*************************** 2. row ***************************

         OBJECT_TYPE: COMMIT

       OBJECT_SCHEMA: NULL

         OBJECT_NAME: NULL

OBJECT_INSTANCE_BEGIN: 140514110303360

           LOCK_TYPE: SHARED

       LOCK_DURATION: EXPLICIT

         LOCK_STATUS: GRANTED

             SOURCE: lock.cc:1194

     OWNER_THREAD_ID: 31  持有锁的内部线程 id 为 31

     OWNER_EVENT_ID: 97

*************************** 3. row ***************************

         OBJECT_TYPE: GLOBAL

       OBJECT_SCHEMA: NULL

         OBJECT_NAME: NULL

OBJECT_INSTANCE_BEGIN: 140514110036384

           LOCK_TYPE: INTENTION_EXCLUSIVE n 意向排他锁

       LOCK_DURATION: STATEMENT

         LOCK_STATUS: PENDING  状态为 pending,表示正在等待被授权

             SOURCE: sql_base.cc:3190

     OWNER_THREAD_ID: 30 被阻塞

     OWNER_EVENT_ID: 2507

3 rows in set (0.04 sec)

找出谁持有 MDL 锁:

一个 shared_write 锁处于 granted 状态,其余是 shared_upgradable、execlusive 锁,shared_upgradable 处于 granted 状态,exclusive 处于 pending 状态

select * from performance_schema.metadata_locks where owner_thread_id!=sys.ps_thread_id(connection_id())\G;

通过 information_schema.innodb_trx 表确认源阻塞线程是否存在一个没有提交的事务:

select * from information_schema.innodb_trx\G;

通过 performance_schema.events_statements_current 来查询某个线程正在执行或者最后一次执行完成的语句事件信息:

select * from performance_schema.events_statements_current where thread_id=11\G;

找出谁持有表级锁:

找出持有表 READ EXTERNAL 表级锁的内部线程 id

select * from performance_schema.table_handles where owner_thread_id!=0\G;

找出线程正在执行什么 sql:

select * from performance_schema.events_statements_current where thread_id=30\G;

找出 processlist_id 来进行 kill

select * from performance_schema.threads where THREAD_ID =30\G;

找出谁持有行级锁:

mysql8

select * from performance_schema.data_locks\G;

mysql 5.7

select * from sys.innodb_lock_waits\G;

查询最近的 topsql 语句:

select thread_id,event_name,source,sys.format_time(timer_wait),sys.format_time(lock_time),sql_text,current_schema,message_text,rows_affected,rows_sent,rows_examined from performance_schema.events_statements_history where current_schema!= performance_schema order by timer_wait desc limit 10\G;

统计后 sql:

select schema_name,digest_text,COUNT_STAR,sys.format_time(sum_timer_wait) as sum_time,sys.format_time(min_timer_wait) as min_time,sys.format_time(avg_timer_wait) as avg_time,sys.format_time(max_timer_wait) as max_time,sys.format_time(sum_lock_time) as sum_lock_time,sum_rows_affected,sum_rows_sent,sum_rows_examined from performance_schema.events_statements_summary_by_digest where schema_name is not null order by count_star desc limit 10\G;

查看最近执行失败的 sql 语句:

select thread_id,event_name,source,sys.format_time(timer_wait) as exec_time, sys.format_time(lock_time) as lock_time,sql_text,current_schema,message_text,rows_affected,rows_sent,rows_examined ,mysql_errno from performance_schema.events_statements_history where mysql_errno=1064\G;

select thread_id,event_name,source,sys.format_time(timer_wait) as exec_time, sys.format_time(lock_time) as lock_time,sql_text,current_schema,message_text,rows_affected,rows_sent,rows_examined ,mysql_errno ,errors from performance_schema.events_statements_history where errors

select schema_name,digest_text,COUNT_STAR,sys.format_time(sum_timer_wait) as sum_time,sys.format_time(min_timer_wait) as min_time,sys.format_time(avg_timer_wait) as avg_time,sys.format_time(max_timer_wait) as max_time,sys.format_time(sum_lock_time) as sum_lock_time,sum_errors,first_seen,last_seen from performance_schema.events_statements_summary_by_digest where sum_errors!=0\G;

查看 sql 语句执行阶段和进度信息:

use performance_schema

update  setup_instruments set enabled= yes ,timed= yes where name like stage/%

update setup_consumers set enabled= yes where name like %stage%

查看语句执行全过程以及每个过程时间开销等。

select thread_id,event_name,source,sys.format_time(timer_wait) as exec_time,work_completed,work_estimated from performance_schema.events_stages_history_long;

查看 sql 语句执行进度信息:

select  * from sys.session where conn_id!=connection_id()\G;

查询最近的事务执行信息:

use performance_schema

update  setup_instruments set enabled= yes ,timed= yes where name like transaction%

update setup_consumers set enabled= yes where name like %transaction%

select thread_id,event_name,state,trx_id,gtid,source,timer_wait,access_mode,isolation_level,autocommit,nesting_event_id,nesting_event_type from performance_schema.events_transactions_current\G;

select thread_id,event_name,state,trx_id,gtid,source,timer_wait,access_mode,isolation_level,autocommit,nesting_event_id,nesting_event_type from performance_schema.events_transactions_history_long\G;

查询多线程复制报错详情:

show slave status\G;

select * from performance_schema.replication_applier_status_by_worker where last_error_message!= \G

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