mysql卡顿处理

MySQL - 锁等待超时与information_schema的三个表：
-- 1.information_schema.innodb_trx–当前运行的所有事务
select *,trx_mysql_thread_id from information_schema.innodb_trx ;

-- information_schema.innodb_locks–当前出现的锁
select * from information_schema.innodb_locks;

-- information_schema.innodb_lock_waits–锁等待的对应关系
select * from information_schema.innodb_lock_waits;

-------------------------------------------------------------------------------------------
伟哥：命令是用来查看当前运行的所有事务：
SELECT
trx_state,
trx_started,
trx_mysql_thread_id,
trx_query,
concat(
'kill ',
trx_mysql_thread_id,
';'
)
FROM
information_schema.innodb_trx
ORDER BY
trx_started -- limit 50

show processlist 看看有没有锁表
kill id
kill 34116988;kill 50403077; kill 50508905

-------------------------------------------------------------------------------------------
//常用
select * from information_schema.innodb_trx where trx_state = 'LOCK WAIT';

SELECT a.* FROM information_schema.processlist a where command <> 'sleep' ORDER BY time desc

select * from information_schema.processlist where time> 60 and user='srapp_stsj';

SELECT
concat('kill',' ', id,';')
FROM
information_schema. PROCESSLIST a
WHERE
command <> 'sleep'
AND info LIKE 'select%'
AND time > 60
and user = 'srapp_stsj'
ORDER BY
time DESC
----------------------------
SELECT
concat('kill',' ', id,';')
FROM
information_schema. PROCESSLIST a
WHERE
command <> 'sleep'
AND info LIKE 'select%'
AND time > 60
and user = 'srapp_stsj'
ORDER BY
time DESC
------------------------------
SELECT
*
FROM
information_schema. PROCESSLIST a
WHERE
command <> 'sleep'
AND info LIKE 'select%'
AND time > 60
and user = 'srapp_stsj'
ORDER BY
time DESC

EXPLAIN
select * from sr_main where sys_scbj = '0' and mdjlx = 'ls_jz' and sys_spzt = 2
and mhzsfz = '330219193210200010'

EXPLAIN
select 1 from sr_main where 1
---------------------------------------
SELECT
*
FROM
information_schema. PROCESSLIST a
WHERE
command <> 'sleep'
AND info LIKE 'select%'
AND time > 60
and user = 'srapp_stsj'
ORDER BY
time DESC

SELECT
concat('kill',' ', trx_mysql_thread_id,';')
FROM
information_schema.innodb_trx