<p>The server complains that @@SESSION.GTID_NEXT still holds a specific GTID after a transaction finished, so it must be reset before the next statement.</p>
<p>MySQL Error 1837 ER_GTID_NEXT_TYPE_UNDEFINED_GROUP arises when @@SESSION.GTID_NEXT remains fixed on a specific GTID after COMMIT or ROLLBACK. Reset the variable to 'AUTOMATIC' or assign a new valid GTID before running further statements to resolve the problem.</p>
When @@SESSION.GTID_NEXT is set to a GTID, you must
Error 1837 triggers when the session variable @@SESSION.GTID_NEXT is still set to a fixed GTID after a transaction ends. MySQL expects the variable to switch back to AUTOMATIC or a new GTID before the next statement begins.
The server protects GTID consistency by refusing further statements until you explicitly update @@SESSION.GTID_NEXT. Ignoring this requirement blocks subsequent DML and DDL, halting application workflows.
Using SET GTID_NEXT='uuid:seq' to run a one-off transaction but forgetting to restore GTID_NEXT='AUTOMATIC' causes the error on the very next statement.
Executing a stored procedure that sets GTID_NEXT internally can leave the variable unchanged if the procedure exits unexpectedly, leading to the same failure.
Immediately after COMMIT or ROLLBACK, run SET GTID_NEXT='AUTOMATIC' to return the session to normal GTID assignment. This clears the undefined group state.
If you need another manual GTID, assign a new, unused GTID before issuing the next statement. Always follow with a reset to AUTOMATIC when finished.
Batch scripts that wrap several DDL statements under specific GTIDs must include a final SET GTID_NEXT='AUTOMATIC' line. Without it, the script stops at the first post-transaction query.
Replication maintenance sessions often toggle GTID_NEXT. Automate the reset step in housekeeping scripts to avoid human error and downtime.
Use SET gtid_next='AUTOMATIC' as the default at the start of every session. Only override it for the briefest scope necessary.
Encapsulate manual GTID logic in stored procedures that always include an ENSURE_AUTO_GN routine in the EXIT handler, guaranteeing cleanup even on failure.
Error 1839 ER_GTID_NEXT_TYPE_INCONSISTENT handles mismatched GTID assignment rules. Fix by aligning GTID_NEXT value with the server's gtid_mode.
Error 1840 ER_GTID_NEXT_TYPE_INCONSISTENT_GROUP emerges when GTID_GROUP is wrong. Correct by setting a valid GTID before proceeding.
The most frequent cause is forgetting to run SET GTID_NEXT='AUTOMATIC' after COMMIT or ROLLBACK.
Scripts terminated mid-transaction leave GTID_NEXT fixed, so the next interactive command fails with error 1837.
Procedures that SET GTID_NEXT but exit on error without cleanup propagate the stale GTID to the caller session.
Developers new to GTID replication often leave the variable unchanged after manual operations.
Raised when GTID_NEXT is set to an undefined transaction type. Fix by specifying AUTOMATIC or a valid GTID.
Occurs when GTID_NEXT conflicts with gtid_mode. Align both settings to resolve.
Triggers when the GTID group does not match the server configuration. Provide a correct GTID or revert to AUTOMATIC.
No. GTID_NEXT must remain available for replication maintenance, but you can restrict its use through user privileges.
Changing GTID_NEXT requires the SESSION_ADMIN or SUPER privilege in MySQL 8.0 and later.
Galaxy highlights session variables in the editor and warns when GTID_NEXT is still set after COMMIT, reducing accidental 1837 errors.
Error 1837 exists in MySQL 5.6 and later when GTID replication is enabled.
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