Frequent MySQL operations cause table locking problems

One 、 Error reporting

org.springframework.dao.CannotAcquireLockException:

### Error updating database. Cause: com.mysql.cj.jdbc.exceptions.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction

This error is due to the frequent operation of threads or other operations mysql The database caused the table to be locked .

Two 、 Solution

1、 Execute the following statement in the database .

SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX;

There will be

2、 And then find   trx_mysql_thread_id Column   

Use kill id; Delete the corresponding thread id Can solve .