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MySQL 1020: Record has changed.

When encountering the error 1020: Record has changed from MySQL, follow these steps immediately:

  1. Identify the Query Causing the Error:



- Capture the exact query or transaction that led to the error. Use application logs or MySQL's general log if it's enabled. To enable the general log temporarily, you can use:

SET global general_log = 1;
SET global log_output = 'table';


After capturing the necessary information, remember to disable it to avoid performance issues:

SET global general_log = 0;

  1. Check for Concurrent Transactions:



- Determine if there are concurrent transactions modifying the same record. You can check for currently running transactions using:

SHOW ENGINE INNODB STATUS;

Look under the `TRANSACTIONS` section for transactions that are currently active or in a lock wait state.

  1. Review Lock Waits and Deadlocks:



- If the error is due to lock contention, review the output from `SHOW ENGINE INNODB STATUS;` for any deadlocks or lock waits and identify the conflicting transactions.

  1. Analyze Transaction Isolation Levels:



- Check if the transaction isolation level is appropriate for your use case. You can view the current level with:

SELECT @@GLOBAL.txisolation, @@txisolation;

If necessary, adjust the isolation level to manage how transactions see modifications made by others.

  1. Inspect Application Logic:



- Ensure your application logic handles optimistic locking correctly, if applicable. This involves re-reading the record before attempting an update and ensuring the version number or timestamp matches.

  1. Retry the Operation:



- Implement logic to retry the transaction in case of such errors, especially if the error is transient and can be resolved by a subsequent attempt.

  1. Monitor Database Performance Metrics:



- Monitor metrics such as lock waits, row lock contention, and transaction throughput to understand if the issue is part of a larger performance problem. Use performance_schema tables or tools like MySQL Workbench for monitoring.

Executing these actions should help in diagnosing and addressing the error 1020: Record has changed in MySQL.

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