3141
MySQLWARNINGNotableProtocolHIGH confidence
Row size exceeded allowed packet; skipped
Production Risk
Medium — silently skipped rows can cause incomplete application data.
What this means
During a result set transmission, a row was larger than the max_allowed_packet setting on the client or server. The row is skipped and a warning is issued rather than raising a hard error.
Why it happens
- 1A BLOB, TEXT, or JSON column contains data larger than max_allowed_packet.
- 2The client max_allowed_packet is set lower than the server setting.
How to reproduce
trigger — this will error
trigger — this will error
SELECT large_blob_col FROM t1; -- when row exceeds max_allowed_packet
expected output
Warning (Code 3141): Row 1 was cut by GROUP_CONCAT(); set group_concat_max_len higher.
Fix 1
Increase max_allowed_packet
Increase max_allowed_packet
SET GLOBAL max_allowed_packet = 67108864; -- 64 MB
Why this works
Allows larger rows to be transmitted without truncation.
Fix 2
Chunk large BLOB columns
Chunk large BLOB columns
SELECT SUBSTRING(large_blob_col, 1, 1048576) FROM t1;
Why this works
Fetches large values in smaller pieces within the packet limit.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3141 ER_WARN_ALLOWED_PACKET_OVERFLOWED
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