Error
Error Code:
1070
MySQL Error 1070: Excessive Index Columns
Description
Error 1070 indicates that you are attempting to create an index in MySQL with too many columns, exceeding the maximum allowed 'key parts' for a single index. This typically occurs during `CREATE TABLE` or `ALTER TABLE` statements when defining primary keys, unique keys, or regular indexes.
Error Message
Too many key parts specified; max %d parts allowed
Known Causes
3 known causesDefault Index Column Limit Exceeded
MySQL has a hard limit on the number of columns that can be included in a single index (typically 16 for InnoDB and MyISAM tables). Defining an index with more columns will trigger this error.
Overly Wide Composite Index Design
Attempting to create a single composite index that combines a large number of columns, often without full awareness of the underlying database design limitations.
ORM/Framework Auto-Indexing
Some ORMs or database migration tools might automatically generate indexes based on schema definitions, inadvertently creating indexes that exceed MySQL's key part limit.
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