MySQL 1213: Deadlock found when trying to get lock.

What is MySQL 1213: Deadlock found when trying to get lock.

Identify the Queries Involved in the Deadlock:

- Run `SHOW ENGINE INNODB STATUS;` to get the latest information about InnoDB engine status, which includes the last deadlock. - Look for the section LATEST DETECTED DEADLOCK. This section shows information about the transactions involved in the last deadlock, including the SQL statements.

Review the Transaction Isolation Level:

- Execute `SELECT @@GLOBAL.txisolation, @@txisolation;` to check the current transaction isolation levels. Sometimes adjusting the isolation level can reduce the likelihood of deadlocks.

Analyze Lock Waits:

- Use `SHOW OPEN TABLES WHERE In_use > 0;` to find tables that are currently locked. - Run `SHOW PROCESSLIST;` to see which threads are running and possibly involved in lock contention.

Kill Blocking Queries if Necessary:

- If you identify a query that is causing a deadlock and it is safe to terminate, use `KILL [thread id];` where `[thread id]` is the ID of the process you want to stop.

Retry the Operation:

- After investigating, retry your operation. Deadlocks are transient errors, and retrying the operation is a common approach.