Error
Error Code:
1069
MySQL Error 1069: Too Many Keys Defined
Description
This error indicates that you are attempting to create or modify a table with more indexes (keys) than the maximum allowed by the MySQL server or its specific storage engine. It typically occurs during `CREATE TABLE` or `ALTER TABLE` operations.
Error Message
Too many keys specified; max %d keys allowed
Known Causes
3 known causesStorage Engine Key Limits
Each MySQL storage engine (e.g., InnoDB, MyISAM) has a specific maximum limit on the number of indexes or keys allowed per table. Exceeding this limit triggers the error.
Excessive Index Creation
Defining an overly large number of single-column or composite indexes on a table can quickly exhaust the available key slots, leading to this error.
Unnecessary or Redundant Indexes
Creating indexes that are not truly needed for query optimization, or defining multiple indexes that serve similar purposes, can contribute to the key count.
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