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MySQL 1249: Cannot update partition index.

When encountering the error 1249: Cannot update partition index in MySQL, immediately take the following action:

  1. Identify the query causing the error by checking the MySQL error log. You can do this by running:


SHOW VARIABLES LIKE 'log_error';
Then, check the log file mentioned in the output for details about the error.

  1. Verify the structure of the table involved, especially focusing on the partitioning scheme. Use:


SHOW CREATE TABLE yourtablename;

  1. Check if the partition key column is being updated by your query. If so, modifying a partition key value is likely causing the issue. Consider if the update can avoid changing the partition key or if restructuring the table's partitioning is necessary.



  1. If the table's structure and partitioning scheme seem correct, look for any triggers that might be indirectly causing the partition index update issue. Use:


SHOW TRIGGERS IN yourdatabasename LIKE 'yourtablename';

  1. Ensure there's enough disk space on the server, as a lack of space might sometimes lead to unexpected errors. Check disk space with:


- For Linux: `df -h`
- For Windows: `chkdsk`

  1. As a temporary measure, if the update is critical and doesn't necessarily require partition key modification, try modifying your update statement to avoid touching the partition key.



If after these steps the issue persists, further investigation into specific MySQL version bugs or contacting a MySQL consultant may be required.

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