Error
Error Code:
1569
MariaDB Error 1569: ALTER TABLE Auto-Increment Duplicates
Description
This error occurs when an `ALTER TABLE` operation attempts to modify a table in a way that forces MariaDB to resequence `AUTO_INCREMENT` values. If the resequencing process encounters existing values in the `AUTO_INCREMENT` column that conflict with newly generated values (e.g., due to an existing unique key or primary key constraint), it will raise this error, preventing the operation from completing. This typically happens when modifying the `AUTO_INCREMENT` column itself or other columns that indirectly affect its sequence.
Error Message
ALTER TABLE causes auto_increment resequencing, resulting in duplicate entry '%s' for key '%s'
Known Causes
4 known causesModifying AUTO_INCREMENT Column
An `ALTER TABLE` statement attempts to change the properties of an `AUTO_INCREMENT` column, such as its data type or start value, on a table that already contains data, triggering a resequencing conflict.
Conflicting Key Constraints
Adding or changing a unique index or primary key on a table, which then conflicts with `AUTO_INCREMENT` values during a resequencing operation, leading to duplicate key errors.
Table Rebuild Operation
Operations like `ALTER TABLE ... ENGINE=InnoDB` or `OPTIMIZE TABLE` might implicitly rebuild the table, triggering `AUTO_INCREMENT` resequencing on a table with existing data that results in conflicts.
Inconsistent Table Data
The internal `AUTO_INCREMENT` counter is out of sync with the actual maximum value in the column, and an `ALTER TABLE` operation exposes this inconsistency by attempting to assign a conflicting value.
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