EC
1771
MySQLERRORNotableStored ProceduresHIGH confidence

Variable cannot be set inside a stored procedure

Production Risk

Low — routine creation or execution fails.

What this means

A SET statement inside a stored procedure attempted to assign a value to a system variable that cannot be changed within a stored routine context.

Why it happens
  1. 1Attempting to set session-restricted or global-only variables inside a stored procedure.
  2. 2Setting GTID_NEXT or similar replication variables inside a routine.
How to reproduce
trigger — this will error
trigger — this will error
DELIMITER //
CREATE PROCEDURE test_proc()
BEGIN
  SET GTID_NEXT = 'AUTOMATIC'; -- not allowed in stored procedures
END//

expected output

ERROR 1771 (HY000): Variable 'gtid_next' cannot be set this way.

Fix

Move the variable assignment outside the stored procedure

Move the variable assignment outside the stored procedure
SET GTID_NEXT = 'AUTOMATIC'; -- execute at session level, not inside a procedure

Why this works

Certain system variables can only be set at session or global scope, not within routines.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1771 ER_VARIABLE_NOT_SETTABLE_IN_SP

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