3344
MariaDBERRORNotableLocking / TransactionHIGH confidence
Invalid hash type for locking clause
Production Risk
Low — query fails; no locks are acquired.
How to reproduce
trigger — this will error
trigger — this will error
SELECT * FROM t FOR UPDATE OF t HASH UNKNOWN_TYPE;
expected output
ERROR 3344 (HY000): Invalid hash type specified in locking clause.
Fix
Use valid locking syntax
Use valid locking syntax
SELECT * FROM t FOR UPDATE;
Why this works
Standard FOR UPDATE syntax without an invalid HASH modifier is accepted.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3344 ER_INVALID_HASH_TYPE
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