EC
1278
MariaDBerrordatahigh confidence

ZLIB: Input data corrupted

Production Risk

Medium — indicates data integrity issues in stored BLOBs.

What this means

UNCOMPRESS() received data that is not valid zlib-compressed content; the data is corrupt.

Why it happens
  1. 1Data was truncated during storage
  2. 2Data was not compressed by MySQL COMPRESS()
  3. 3Bit-level corruption in a BLOB column
How to reproduce
trigger — this will error
trigger — this will error
SELECT UNCOMPRESS('not_compressed_data');

expected output

ERROR 1278 (HY000): ZLIB: Input data corrupted

Fix 1

Validate data source

Validate data source
SELECT LENGTH(col), UNCOMPRESSED_LENGTH(col) FROM t;

Why this works

A NULL from UNCOMPRESSED_LENGTH indicates invalid zlib data.

Fix 2

Re-compress from original source

Why this works

Restore the original uncompressed data and re-apply COMPRESS().

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1278 ER_ZLIB_Z_DATA_ERROR

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