Error
Error Code:
1020
MySQL Error 1020: Stale Data Update Attempt
Description
MySQL Error 1020, 'Record has changed since last read', indicates a data concurrency conflict. This error occurs when an application attempts to modify or delete a record in a table, but the record's state has been altered by another transaction since it was originally retrieved by the current session. It signals that the data you're trying to act upon is no longer the same as when you last read it, preventing an update based on stale information.
Error Message
Record has changed since last read in table '%s'
Known Causes
4 known causesConcurrent Data Modification
Another user or process updated or deleted the target record after your application initially read it, invalidating your current operation.
Optimistic Locking Mismatch
If your application uses optimistic locking (e.g., version columns), the version number or timestamp in your update statement doesn't match the current record's version, indicating a change.
Prolonged Transaction Lifespan
Transactions that hold data for an extended period increase the likelihood of other transactions modifying the same records before the first transaction attempts its final update.
Stale Data in Application Cache
The application might be attempting to operate on data that was cached or retrieved a long time ago without re-verifying its current state in the database.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service