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This article introduces how to distinguish between deadlock and lock waiting in MySQL. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

[database version] MySQL5.7

Program error 1205 Lock wat timeout exceeded, thought to be deadlock, in fact, are two concepts, indicating that the deadlock monitoring module is no problem. Deadlock monitoring is a deadlock, not lock waiting.

The error message is as follows:

SQLSTATEHY000]: General error: 1205 Lock wat timeout exceeded; try restarting transaction (SQL: UPDATE xx set xxx = 1205 where id=1 and rock_id > 1)

1213 Deadlock found when trying to get lock; try restarting transaction

Https://www.cnblogs.com/tartis/p/9366574.html

Https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlock-example.html

MySQL 5.7We can query lock status information with the following statement

SELECT r.trx_id waiting_trx_id, r.trx_mysql_thread_id waiting_thread, r.trx_query waiting_query, b.trx_id blocking_trx_id, b.trx_mysql_thread_id blocking_thread B.trx_query blocking_query FROM information_ schema.`INNODB _ LOCK_ WAITS` w INNER JOIN information_ schema.`INNODB _ TRX`b ON b.`trx _ id` = w.`requests _ trx_ id`INNER JOIN information_ schema.`INNODB _ T RX`r ON r.`trx _ id` = w.`requesting _ trx_ id`

MySQL8.0, we view the lock information with the following statement

Select * from * innocent database lockout waits; this is all about how to distinguish between deadlocks and lock waits in MySQL. I hope the above content can be of some help and learn more knowledge. If you think the article is good, you can share it for more people to see.

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