Mysql database query freeze timeout problem analysis

Problem Description

The mysql database is stuck, no data can be found, timeout, etc. can use this sql query problem.

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Reason view:

select * from information_schema.processlist where COMMAND !=‘Sleep’ order by time desc;

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solution:

Check the TIME timeout time, check the INFO abnormal sql, you can kill the stalled process, temporarily solve the current problem, and then analyze and optimize the stalled sql separately.