1276
MySQLerrorserverhigh confidence
ZLIB: Not enough memory
Production Risk
Medium — indicates the server is low on memory, which may affect other queries.
What this means
A COMPRESS() or UNCOMPRESS() call failed because the zlib library could not allocate enough memory.
Why it happens
- 1Server is under memory pressure
- 2Very large compression/decompression operation on a low-memory system
How to reproduce
trigger — this will error
trigger — this will error
SELECT COMPRESS(REPEAT('x', 1000000));expected output
ERROR 1276 (HY000): ZLIB: Not enough memory
Fix 1
Increase available memory
Why this works
Reduce concurrent workload or increase server RAM.
Fix 2
Process data in smaller chunks
Why this works
Split large BLOB operations into smaller batches.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1276 ER_ZLIB_Z_MEM_ERROR
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