1277
MySQLerrordatahigh confidence
ZLIB: Not enough room in the output buffer
Production Risk
Low — function call fails; no data is changed.
What this means
COMPRESS() or UNCOMPRESS() failed because the output buffer is too small, often indicating the data cannot be compressed further or that compression is unsupported for this data.
Why it happens
- 1Attempting to compress already-compressed or incompressible data
- 2Internal zlib buffer sizing issue
How to reproduce
trigger — this will error
trigger — this will error
SELECT COMPRESS(COMPRESS('already compressed'));expected output
ERROR 1277 (HY000): ZLIB: Not enough room in the output buffer
Fix
Avoid double-compressing
Why this works
Do not compress data that is already compressed; the output can be larger than the input.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1277 ER_ZLIB_Z_BUF_ERROR
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