Mysql Lock wait timeout exceeded processing method
1. A question
When working on a project today, I suddenly encountered the following problem
What's going on, this interface has been normal before. Judging from the error results, it should be a problem with the database.
Execute this update statement and find that the lock connection of the database has timed out
2. Solutions
-- 当前运行的所有事务
SELECT * FROM information_schema.INNODB_TRX;
Execute the above statement, the result is as follows (the timeout transaction has been killed by me, so there is no data)
See if there is a locked transaction thread in the transaction table INNODB_TRX, if there is a locked transaction, find its trx_mysql_thread_id,
-- 查看数据库当前的进程
show processlist;
Check whether there is this id in the current process of the database. If it exists, it proves that the sleep thread transaction has not been committed or rolled back but stuck, and we need to kill it manually.
-- kill 命令(kill 加上 id值)
kill id
At this time, it was found that the update was normal