Error
Error Code:
1256
MySQL Error 1256: Uncompressed Data Too Large
Description
This error indicates that MySQL encountered a block of data that, when uncompressed, exceeded its internal maximum size limit. This often happens when dealing with compressed data (e.g., from `COMPRESS()` function or compressed columns) that is either genuinely very large or has been corrupted, leading to an incorrect reported uncompressed size.
Error Message
Uncompressed data size too large; the maximum size is %d (probably, length of uncompressed data was corrupted)
Known Causes
3 known causesCorrupted Compressed Data
The stored or transmitted compressed data might be damaged, causing MySQL to miscalculate its uncompressed size beyond the allowed limit.
Excessively Large Data Blocks
Data being processed, even when validly compressed, is genuinely too large for MySQL's internal buffers when uncompressed.
Network Data Corruption
Problems in the network or client-server communication might corrupt compressed data during transit, leading to an incorrect uncompressed size calculation.
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