<p>The server blocks SET @@SESSION.GTID_NEXT = 'UUID:NUMBER' because @@GLOBAL.GTID_MODE is OFF.</p>
<p>MySQL Error 1781: ER_CANT_SET_GTID_NEXT_TO_GTID_WHEN_GTID_MODE_IS_OFF happens when you assign @@SESSION.GTID_NEXT to a specific UUID:NUMBER while GTID replication is disabled. Re-enable GTID_MODE or set GTID_NEXT to AUTOMATIC to clear the error.</p>
@@SESSION.GTID_NEXT cannot be set to UUID:NUMBER when
MySQL throws Error 1781 when you execute SET @@SESSION.GTID_NEXT = "UUID:NUMBER" while the server variable @@GLOBAL.GTID_MODE is OFF. Because Global Transaction Identifiers are disabled, the server refuses any manual GTID assignment.
The error shows up in standalone servers and replication clusters during migrations, point-in-time recovery, or scripted replication tasks that assume GTID support is active.
The error blocks the current transaction and can halt automation pipelines that rely on deterministic GTID values. In replication setups, failure to inject an expected GTID produces gaps that threaten failover and recovery strategies.
Production environments depending on GTID-based replication must guarantee GTID_MODE is ON before any GTID_NEXT directive executes.
Run SHOW GLOBAL VARIABLES LIKE 'gtid_mode'; and SHOW SESSION VARIABLES LIKE 'gtid_next'; to confirm server state. Review configuration files, SET PERSIST statements, or CHANGE MASTER TO commands that might have switched GTID mode.
If GTID_MODE is OFF, any attempt to preset GTID_NEXT reproduces the error. If GTID_MODE is ON, investigate other issues such as syntax or privileges.
Galaxy's context-aware editor flags variable mismatches in real time. When you write SET @@SESSION.GTID_NEXT = 'UUID:NUMBER'; while connected to a server with GTID_MODE = OFF, Galaxy highlights the line and suggests enabling GTIDs or switching to AUTOMATIC before execution, preventing runtime failures.
The gtid_mode variable is explicitly OFF, disabling all GTID features.
Version upgrades reset gtid_mode to OFF when my.cnf is regenerated or omitted.
Backup or migration scripts copied from another environment inject GTIDs without checking gtid_mode.
A DBA disables GTID replication for troubleshooting and forgets to re-enable it before running GTID_NEXT statements.
Raised when you turn GTID_MODE to ON while enforce_gtid_consistency is OFF.
Occurs when the GTID in GTID_NEXT is outside the server's gtid_executed set.
Triggered when a non-transactional table is modified during GTID-consistent mode.
Yes. OFF_PERMISSIVE accepts GTID_NEXT assignments but disables automatic GTID generation, making it useful for transitional periods.
MySQL 8.0 lets you switch from OFF to ON with SET PERSIST, but a restart is still required to leave OFF state. Plan maintenance windows.
Change GTID_MODE to OFF_PERMISSIVE, wait for replicas to catch up, then set it to OFF. Remove GTID statements from scripts.
No. Galaxy provides inline warnings and suggested commands, but variables change only when you run the statements, preserving administrator control.
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