<p>MySQL raises error 1560 when a stored function or trigger attempts to change the global or session binary logging mode.</p>
<p>MySQL Error 1560 ER_STORED_FUNCTION_PREVENTS_SWITCH_BINLOG_FORMAT occurs when SET binlog_format is executed inside a stored function or trigger. Move the SET statement outside the routine or disable binary logging for the session before calling the routine to resolve the issue.</p>
Cannot change the binary logging format inside a stored
MySQL throws error 1560 with the message "Cannot change the binary logging format inside a stored function or trigger" when the server encounters a SET binlog_format statement while already executing a stored function, stored procedure, or trigger.
The server blocks this operation because switching the binary log format mid-statement can break replication consistency. Understanding why the restriction exists helps you apply the correct workaround.
The immediate cause is a call to SET binlog_format = 'ROW'|'STATEMENT'|'MIXED' inside the body of a routine that itself may be logged. MySQL disallows format changes during routine execution to protect the binary log.
Another scenario is an AFTER trigger containing dynamic SQL that changes binlog_format. Even if the trigger is indirect, the server still prevents the change.
Remove the SET binlog_format line from the routine and execute it in the client session before calling the function or procedure. This keeps the logging context stable while meeting your replication needs.
When you need different formats for different statements, split the workflow: commit the routine call under one format, then switch formats in a separate transaction.
Developers sometimes embed SET binlog_format = 'ROW' in maintenance procedures. Refactor these procedures to accept a desired format parameter and set the format outside the procedure.
ETL scripts that wrap DML in stored procedures also hit this error. Update the script so it issues SET binlog_format before the CALL command instead of inside.
Define binary logging policies at the session or global level during connection initialization, not within individual routines.
Use MySQL 5.7+ where MIXED logging is usually sufficient for both deterministic and non-deterministic statements, reducing the need for explicit switches.
Error 1418 ER_NONEXISTING_PROC_GRANT appears when privileges on routines are missing. Grant EXECUTE to fix it.
Error 1227 ER_SPECIFIC_ACCESS_DENIED_ERROR arises when a user lacks SUPER to change global settings. Use a privileged account or elevate privileges responsibly.
The function body contains SET binlog_format.
A trigger executes CONCAT('SET binlog_format=', fmt) via PREPARE.
The procedure temporarily changes logging format for specific statements.
Automated scripts switch formats while routines are active.
Raised when an unsupported value is passed to SET binlog_format.
Occurs when the current user lacks SUPER privilege to modify global settings.
Appears when PURGE BINARY LOGS is blocked by active replication threads.
No. MySQL forbids changing binlog_format within stored functions, procedures, and triggers to keep replication consistent.
Yes. Setting sql_log_bin=0 for the session before calling the routine avoids the error, but use it only when you understand replication implications.
MariaDB follows the same restriction, so you will see a similar error message.
Galaxy highlights session variables and warns when SET statements are used inside routines, helping you refactor code before it reaches production.
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