<p>MySQL raises error 1768 when you attempt to change @@SESSION.GTID_NEXT after a transaction has started.</p>
<p>MySQL Error 1768 ER_CANT_CHANGE_GTID_NEXT_IN_TRANSACTION appears when @@SESSION.GTID_NEXT is set inside an open transaction. End or commit the current transaction, then change the variable before starting a new one to resolve the issue.</p>
The system variable @@SESSION.GTID_NEXT cannot change
Error 1768 occurs when a session tries to modify the @@SESSION.GTID_NEXT system variable after a transaction has begun. MySQL forbids altering the target GTID value mid-transaction to preserve global transaction ID consistency across replication.
The server throws ER_CANT_CHANGE_GTID_NEXT_IN_TRANSACTION with SQL state HY000 as soon as SET @@SESSION.GTID_NEXT=... is executed between BEGIN and COMMIT or inside an implicit transactional statement such as CREATE TABLE.
The variable @@SESSION.GTID_NEXT determines the GTID that the next transaction will record. Once the first statement of a transaction executes, MySQL locks this value. Attempting to change it inside that transaction triggers error 1768.
Operations that implicitly start a transaction, for example DDL when autocommit=0, also create the same problem if a later SET @@SESSION.GTID_NEXT is issued.
Always set @@SESSION.GTID_NEXT before the transaction starts. End the current transaction with COMMIT or ROLLBACK, then perform the SET statement, and finally start a new transaction.
If you only need to reset to automatic GTID assignment, run SET @@SESSION.GTID_NEXT='AUTOMATIC' outside any transaction.
Replication administrators often switch GTID_NEXT when manually injecting a transaction. Doing so inside an active session pool that already began work triggers 1768; commit first, then switch.
DDL scripts that wrap multiple CREATE statements in one transaction must move all GTID_NEXT manipulations to the top of the script before BEGIN.
Enable autocommit when running maintenance commands that change GTID_NEXT to guarantee no open transaction exists.
Use a dedicated connection for GTID maintenance to avoid accidental conflicts.
Error 1837 ER_GTID_UNSAFE_AUTOCOMMIT arises when statements unsafe for GTID run with autocommit=1. Wrap them in a transaction or disable GTID mode.
Error 1830 ER_CANT_SET_GTID_PURGED occurs when you attempt to set GTID_PURGED while gtid_mode is OFF. Turn on GTID mode before altering GTID_PURGED.
Issuing SET @@SESSION.GTID_NEXT='UUID:NUMBER' after BEGIN or after any statement that starts a transaction.
DDL or DML with autocommit disabled starts an implicit transaction, so a later GTID_NEXT change fails.
Applications reusing a connection may inherit an open transaction and unknowingly change GTID_NEXT.
Maintenance scripts that mix COMMIT or ROLLBACK and GTID changes in the wrong order.
Raised when an unsafe statement executes with autocommit enabled in GTID mode.
Occurs when attempting to set GTID_PURGED while gtid_mode is OFF.
Indicates that GTID mode is OFF when an operation requires it to be ON.
No. The restriction is hard coded to maintain replication integrity. Always change GTID_NEXT outside a transaction.
Yes. When autocommit=0 the first statement starts a transaction automatically, so subsequent GTID_NEXT changes will fail.
Run SHOW ENGINE INNODB STATUS or monitor information_schema.innodb_trx to see active transactions.
Galaxy highlights session variables and transaction boundaries in its editor, making it easy to spot a misplaced SET @@SESSION.GTID_NEXT before you run the query.
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