Error
Error Code:
1073
MySQL Error 1073: Invalid BLOB Key Specification
Description
This error occurs when you attempt to define a key (like PRIMARY KEY, UNIQUE KEY, or a regular INDEX) on a BLOB or TEXT column without specifying a prefix length. MySQL storage engines generally do not support direct indexing of entire BLOB/TEXT columns due to their potentially large and variable size.
Error Message
BLOB column '%s' can't be used in key specification with the used table type
Known Causes
3 known causesDirect BLOB/TEXT Key Definition
Attempting to define a PRIMARY KEY or UNIQUE KEY directly on a BLOB or TEXT column, which is not allowed without a prefix length.
Missing Prefix for BLOB/TEXT Index
Creating a regular INDEX on a BLOB or TEXT column without specifying a necessary prefix length to index only a portion of the data.
Storage Engine Constraints
The chosen MySQL storage engine has specific rules or limitations regarding how BLOB and TEXT types can be used in key specifications.
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