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---- 查看事務(wù)鎖阻塞線程和等待線程
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?yàn)榫€程在一個(gè)事務(wù)中空閑而正在遭受大量的鎖操作，下面的這個(gè)變種查詢可以
-- 告訴你有多少查詢被哪些線程阻塞，而沒有多余的無用信息。
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 -- 注意線程4是阻塞的源頭
  idle_in_trx: 2051
max_wait_time: 10
  num_waiters: 3  -- 線程4 阻塞的 線程最多，由此判斷線程4是阻塞的源頭
*************************** 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中如何實(shí)現(xiàn)定位空閑會(huì)話事務(wù)沒提交導(dǎo)致鎖阻塞的腳本”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對(duì)大家有所幫助，如果還想學(xué)習(xí)更多知識(shí)，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道！

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