Question

我在某些更新时遇到问题，删除并插入。

我发现在mysql上输入 SHOW ENGINE INNODB STATUS 会显示最后的死锁：

------------------------
LATEST DETECTED DEADLOCK
------------------------
171128  2:10:22
*** (1) TRANSACTION:
TRANSACTION 23 2653931321, ACTIVE 3 sec, process no 19519, OS thread id 123471633422080 inserting
mysql tables in use 1, locked 1
LOCK WAIT 3 lock struct(s), heap size 1216, 2 row lock(s), undo log entries 1
MySQL thread id 57910754, query id 25462868783 localhost 127.0.0.1 ***** update
INSERT IGNORE INTO tb01 (`id_agendamento`,`nm_usuario`,`id_usuario`,`dt_cache`) values ('3000373','fulano','27861269','2017-11-28 02:10:19')
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 6137 page no 54196 n bits 672 index `id_agendamento` of table `dbinfos`.`tb01` trx id 23 2653931321 lock mode S waiting
Record lock, heap no 259 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
 0: len 3; hex adc835; asc   5;; 1: len 8; hex 3237383631323639; asc 27861269;; 2: len 4; hex 80921b71; asc    q;;

*** (2) TRANSACTION:
TRANSACTION 23 2653285408, ACTIVE 143 sec, process no 19519, OS thread id 123471351097088 fetching rows, thread declared inside InnoDB 468
mysql tables in use 1, locked 1
109238 lock struct(s), heap size 13187056, 26792384 row lock(s), undo log entries 12217038
MySQL thread id 57906706, query id 25461633354 localhost 127.0.0.1 ***** updating
DELETE from tb01 WHERE dt_cache < DATE_ADD(CURDATE(), INTERVAL -1 DAY)
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 6137 page no 54196 n bits 672 index `id_agendamento` of table `dbinfos`.`tb01` trx id 23 2653285408 lock_mode X locks rec but not gap
Record lock, heap no 259 PHYSICAL RECORD: n_fields 3; compact format; info bits 32
 0: len 3; hex adc835; asc   5;; 1: len 8; hex 3237383631323639; asc 27861269;; 2: len 4; hex 80921b71; asc    q;;

但我无法理解如何修复它，有人可以帮助我吗？

先谢谢。

Answer 1

这里只是一个疯狂的猜测，但你是不是只是在代码中打开一个事务并在打开它之后做了一些繁重的工作？

如果没有，那么是的dba.stackexchange可能是最好的地方。

mysql上超出了死锁和锁定超时的问题

1 个答案: