Error
Error Code:
1284
MySQL Error 1284: Unknown Key Cache Reference
Description
This error indicates that MySQL encountered a reference to a key cache that it does not recognize or that has not been properly configured. It typically occurs when an SQL statement (like `CACHE INDEX`) or a server configuration parameter refers to a key cache by a name that is either misspelled or not defined.
Error Message
Unknown key cache '%s'
Known Causes
3 known causesIncorrect Key Cache Name in SQL
The name of the key cache specified in an SQL statement (e.g., `CACHE INDEX`, `LOAD INDEX INTO CACHE`) does not match any existing or defined key cache.
Undefined Key Cache Configuration
The key cache referenced has not been properly defined in the MySQL server's configuration file (`my.cnf` or `my.ini`), or the server has not been restarted for changes to take effect.
Dynamic Configuration Mismatch
An attempt was made to use a key cache name that was intended to be dynamically configured but was not successfully applied or recognized by the server during runtime.
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