Error
Error Code:
1089
MariaDB Error 1089: Incorrect Prefix Key Definition
Description
This error occurs when MariaDB encounters an issue with the definition or usage of a prefix index. It typically indicates that the column type is unsuitable, the specified prefix length is invalid, or the storage engine does not support the requested index configuration.
Error Message
Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique prefix keys
Known Causes
4 known causesNon-String Column Type
The column targeted for the prefix index is not a string data type (e.g., INT, DATETIME), which is incompatible with prefix indexing.
Prefix Length Mismatch
The specified prefix length for the index exceeds the defined length of the string column or is invalid for the column type.
Storage Engine Incompatibility
The table's storage engine (e.g., MyISAM, InnoDB) does not support unique prefix keys or has specific limitations on their use.
Incorrect Index Syntax
The SQL statement used to create or modify the index contains errors in how the prefix key is defined.
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