189 8069 5689
这篇文章主要为大家展示了“MySQL中如何实现定位空闲会话事务没提交导致锁阻塞的脚本”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“mysql中如何实现定位空闲会话事务没提交导致锁阻塞的脚本”这篇文章吧。
为元江县等地区用户提供了全套网页设计制作服务，及元江县网站建设行业解决方案。主营业务为成都做网站、网站制作、元江县网站设计，以传统方式定制建设网站，并提供域名空间备案等一条龙服务，秉承以专业、用心的态度为用户提供真诚的服务。我们深信只要达到每一位用户的要求，就会得到认可，从而选择与我们长期合作。这样，我们也可以走得更远！
---- 查看事务锁阻塞线程和等待线程
SELECT r.trx_id AS waiting_trx_id,r.`trx_mysql_thread_id` AS waiting_thread,
TIMESTAMPDIFF(SECOND,r.trx_wait_started,CURRENT_TIMESTAMP) AS wait_time,
r.`trx_query` AS waiting_query,l.`lock_table` AS waiting_table_lock,
l.lock_index AS waiting_index_lock,
b.trx_id AS blocking_trx_id,b.`trx_mysql_thread_id` AS blocking_thread,
SUBSTRING(p.host,1,INSTR(p.host,':')-1) AS blocking_host,
SUBSTRING(p.host,INSTR(p.host,':')+1) AS blocking_port,
IF(p.command="Sleep",p.time,0) AS idle_in_trx,
b.`trx_query` AS blocking_query
FROM information_schema.`INNODB_LOCK_WAITS` AS w
INNER JOIN information_schema.`INNODB_TRX` AS b ON b.trx_id=w.blocking_trx_id
INNER JOIN information_schema.`INNODB_TRX` AS r ON r.trx_id = w.requesting_trx_id
INNER JOIN information_schema.`INNODB_LOCKS` AS l ON w.requested_lock_id=l.lock_id
LEFT JOIN information_schema.`PROCESSLIST` AS p ON p.id=b.trx_mysql_thread_id
ORDER BY wait_time DESC\G
SELECT * FROM information_schema.`INNODB_LOCKS`\G
-- 如果你因为线程在一个事务中空闲而正在遭受大量的锁操作，下面的这个变种查询可以
-- 告诉你有多少查询被哪些线程阻塞，而没有多余的无用信息。
SELECT CONCAT('thread ',b.trx_mysql_thread_id,' from ',p.host) AS who_blocks,
IF(p.command="Sleep",p.time,0) AS idle_in_trx,
MAX(TIMESTAMPDIFF(SECOND,r.trx_wait_started,NOW())) AS max_wait_time,
COUNT(*) AS num_waiters
FROM information_schema.`INNODB_LOCK_WAITS` AS w
INNER JOIN information_schema.`INNODB_TRX` AS b ON b.trx_id=w.`blocking_trx_id`
INNER JOIN information_schema.`INNODB_TRX` AS r ON r.`trx_id`= w.`requesting_trx_id`
LEFT JOIN information_schema.`PROCESSLIST` AS p ON p.id= b.`trx_mysql_thread_id`
GROUP BY who_blocks ORDER BY num_waiters DESC\G
*************************** 1. ROW ***************************
who_blocks: thread 4 FROM localhost -- 注意线程4是阻塞的源头
idle_in_trx: 2051
max_wait_time: 10
num_waiters: 3 -- 线程4 阻塞的 线程最多，由此判断线程4是阻塞的源头
*************************** 2. ROW ***************************
who_blocks: thread 20 FROM Lenovo-PC:51603
idle_in_trx: 0
max_wait_time: 6
num_waiters: 2
*************************** 3. ROW ***************************
who_blocks: thread 11 FROM localhost
idle_in_trx: 0
max_wait_time: 5
num_waiters: 1
3 ROWS IN SET (0.00 sec)
set global tx_isolation='read-committed';
set session tx_isolation='read-committed';
select @@global.tx_isolation,@@tx_isolation;
以上是“mysql中如何实现定位空闲会话事务没提交导致锁阻塞的脚本”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！