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To resolve a MySQL deadlock error 1213, you can try the following steps:
Identify the cause of the deadlock: Use the SHOW ENGINE INNODB STATUS command to identify which transactions are involved in the deadlock and which resource(s) they are trying to access.
Roll back one of the transactions: Determine which transaction is less critical or can be easily rolled back and terminate it by using the KILL statement or the ROLLBACK command.
Retry the transaction: If rolling back a transaction is not an option, retry the transaction after a short delay using the ROLLBACK and START TRANSACTION commands. This may release any locks held on resources and allow the transaction to proceed.
Optimize the queries: You can avoid deadlocks by optimizing the queries, adjusting the isolation level, and reducing the length of the transactions.
Increase resources: If the deadlock error persists frequently, it may be due to insufficient resources such as memory or CPU. Increase the resources or upgrade your server to avoid the deadlock error.