<p>MySQL raises error 1571 ER_EVENT_SET_VAR_ERROR when the event scheduler cannot execute a SET statement while starting or stopping an EVENT.</p>
<p>MySQL Error 1571 ER_EVENT_SET_VAR_ERROR occurs when the event scheduler cannot apply a SET variable during start or stop. Check the EVENT body for invalid SET syntax, replace session-only variables, grant proper privileges, then restart the scheduler to resolve the issue.</p>
Error during starting/stopping of the scheduler. Error
MySQL error 1571, named ER_EVENT_SET_VAR_ERROR, signals that the EVENT scheduler failed while executing a SET statement embedded in an EVENT definition or used during scheduler start or stop.
The server aborts the scheduler action to avoid running an EVENT with inconsistent session variables, leaving the scheduler disabled until the error is corrected.
The error arises when a SET statement inside the CREATE EVENT body or in a global scheduler start/stop command references a variable that cannot be set in that context.
Session-only variables, unsupported SQL modes, or insufficient account privileges commonly block the scheduler from applying the statement.
First, locate the failing SET clause with SHOW EVENTS or check the MySQL error log. Replace session-only variables with permissible global variables, or move the SET into the event body.
Grant SUPER or EVENT privileges if the account lacks rights to change the target variable. After updates, restart the scheduler with SET GLOBAL event_scheduler = ON.
Developers often copy session tuning statements, such as SET sql_mode = '', into CREATE EVENT definitions. Removing or refactoring these lines clears the error.
Another scenario is upgrading MySQL, where a deprecated variable inside an EVENT now triggers 1571. Updating the variable name resolves the issue.
Avoid embedding SET statements that modify session or deprecated variables in CREATE EVENT. Use deterministic SQL inside the EVENT body instead.
Always test new EVENTS in a staging database with the scheduler enabled, and monitor the MySQL error log after deployment.
Error 1577 (ER_EVENT_STORE_FAILED) appears if an EVENT cannot be stored, often co-occurring with 1571. Fix invalid syntax, then recreate the EVENT.
Error 1537 (ER_EVENT_ALREADY_EXISTS) surfaces when an EVENT of the same name exists. Drop or rename the existing EVENT before re-creating it.
Using invalid or deprecated variable names in a CREATE EVENT statement prevents the scheduler from applying the SET.
Variables such as @myvar or SET autocommit = 0 are session-scoped and cannot be applied at scheduler start.
The database user starting the scheduler lacks rights to assign the targeted system variable.
Upgrades may deprecate or change variable behavior, making older SET clauses fail.
Occurs when an EVENT cannot be saved due to syntax or privilege issues. Correct the definition and recreate.
Triggered when an EVENT name clashes with an existing one. Drop or rename the existing EVENT before creation.
Raised if an EVENT references a stored procedure that cannot be found. Create or correct the referenced procedure.
Yes. When the scheduler cannot start due to ER_EVENT_SET_VAR_ERROR, all scheduled EVENTS remain disabled until the issue is fixed and the scheduler is restarted.
You can drop and recreate the EVENT without the problematic SET or move the SET logic into the event body using standard SQL.
Error 1571 exists in MySQL 5.1 and later, including 8.x. The exact variables that trigger it vary by version.
Galaxy highlights deprecated variables and privilege issues in real time, letting engineers correct the EVENT before it is saved.
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