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MySQL 1229: Cannot drop partition.
When you encounter the error "1229: Cannot drop partition" in MySQL, follow these immediate actions:
- Check Partition Usage: Verify if the partition you're trying to drop is in use by querying:
SELECT TABLENAME, PARTITIONNAME, TABLE_ROWS
FROM information_schema.partitions
WHERE TABLESCHEMA = 'yourdatabasename' AND TABLENAME = 'yourtablename';
Replace `yourdatabasename` and `yourtablename` with the appropriate values.
- Review Foreign Key Constraints: Ensure the partition isn't constrained by foreign keys, which can prevent dropping. Check constraints with:
SELECT CONSTRAINTNAME, TABLENAME
FROM informationschema.REFERENTIALCONSTRAINTS
WHERE CONSTRAINTSCHEMA = 'yourdatabase_name';
- Examine Locks: Determine if there are any locks on the partition/table:
SHOW OPEN TABLES WHERE In_use > 0;
- Check Data Consistency: Ensure there's no data corruption. Consider running a table check:
CHECK TABLE yourtablename FOR UPGRADE;
- Review the MySQL Error Log: Look for any related errors that might provide more context. The log location varies but can often be found in `/var/log/mysql/error.log` or by querying:
SHOW VARIABLES LIKE 'log_error';
- Try Removing Partition with Full Syntax: If you were using a shorthand method, specify the full partition syntax:
ALTER TABLE yourtablename DROP PARTITION partition_name;
Replace `yourtablename` and `partition_name` with the correct values.
Remember, if the issue persists, further investigation into MySQL's documentation or seeking help from a MySQL community might be necessary, given the absence of a database administrator.
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