<p>MySQL raises error 1777 when CHANGE MASTER TO MASTER_AUTO_POSITION = 1 is executed while @@GLOBAL.GTID_MODE is not ON.</p>
<p>MySQL Error 1777: ER_AUTO_POSITION_REQUIRES_GTID_MODE_ON occurs when you enable MASTER_AUTO_POSITION without turning GTID_MODE ON. Switch GTID mode to ON at the global level, restart replication with CHANGE MASTER TO MASTER_AUTO_POSITION = 1, and the error clears.</p>
CHANGE MASTER TO MASTER_AUTO_POSITION = 1 can only be
Error 1777 signals that the server rejected the statement CHANGE MASTER TO MASTER_AUTO_POSITION = 1 because global GTID mode is not ON. Auto-positioning depends on Global Transaction IDs, so replication refuses to start until GTID mode is enabled.
The error appears during replication setup or reconfiguration when you try to switch a replica to GTID auto-positioning while the source or replica still operates with @@GLOBAL.GTID_MODE set to OFF or OFF_PERMISSIVE.
Ignoring the error leaves replication stopped, creating data drift between primary and replica. Production systems risk inconsistent reads, stale analytics, and potential failover failures until synchronization is restored.
MySQL requires GTID mode to be ON before it can calculate positions automatically. Any mismatch between the requested MASTER_AUTO_POSITION setting and the current GTID configuration triggers the error.
The fix is to enable GTID mode globally, restart the server if needed, and reissue the CHANGE MASTER TO statement with MASTER_AUTO_POSITION = 1.
On servers upgraded from MySQL 5.6, GTID mode often remains OFF, so enabling auto-positioning fails. Switching GTID_MODE to ON and recycling the replica resolves the issue.
Always check SHOW VARIABLES LIKE 'gtid_mode' before changing replication options. Automate validation scripts in deployment pipelines to confirm GTID mode alignment between source and replicas.
Errors 1776 and 1778 also stem from GTID misconfiguration. Correcting GTID_MODE or GTID_PURGED typically clears all three.
The server variable gtid_mode remains OFF after installation or upgrade, so any request for auto-positioning fails.
The replica has GTID_MODE=ON but the primary is OFF, preventing replication hand-shake.
Transition modes allow GTID writes but block auto-positioning, still raising error 1777 until fully ON.
GTID_MODE changes persist only after restart in some versions; neglecting the reboot leaves the old value active.
Raised when MASTER_AUTO_POSITION is assigned a value other than 0 or 1. Correct the argument to clear the error.
Occurs when implicit commit statements run inside transactions while GTID mode is ON. Refactor statements or disable the transaction wrapper.
Appears when you attempt to set gtid_purged while GTID_MODE is OFF. Enabling GTID mode resolves it.
Yes. Auto-positioning works only when every server in the replication chain runs with GTID_MODE set to ON.
The change itself is quick, but a controlled restart is required. Plan a brief maintenance window or use rolling restarts.
You can disable GTID mode, but it requires another restart and careful coordination to avoid data loss.
Galaxy's SQL editor surfaces replication variables in context, highlights GTID inconsistencies, and lets teams review CHANGE MASTER statements collaboratively before execution.
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