<p>MySQL raises error 1778 when an implicitly committing statement runs inside an open transaction while GTID_NEXT is locked to a specific UUID:NUMBER.</p>
<p>MySQL Error 1778 ER_CANT_DO_IMPLICIT_COMMIT_IN_TRX_WHEN_GTID_NEXT_IS_SET means the server blocked a statement that would implicitly commit while GTID_NEXT is fixed. Restore GTID_NEXT to AUTOMATIC, complete or roll back the transaction, or move the implicit-commit statement outside the transaction to resolve the issue.</p>
Cannot execute statements with implicit commit inside a
Error 1778 appears when MySQL detects an implicit commit inside an active transaction while the session variable GTID_NEXT is set to a literal UUID:NUMBER. Because GTID assignment is manual, the server forbids any statement that would silently commit and break the deterministic GTID sequence.
The error surfaces after START TRANSACTION or BEGIN when a DDL or other implicitly committing statement such as CREATE, ALTER, DROP, or TRUNCATE runs while GTID_NEXT is not AUTOMATIC. MySQL stops the statement to preserve transactional integrity and GTID ordering.
Leaving a transaction in this blocked state prevents further work, holds locks, and can impact replication because GTID events will not advance. Resolving the error promptly restores normal transaction flow and avoids locking or replication lag.
Running CREATE, ALTER, or DROP immediately after BEGIN triggers an implicit commit that MySQL blocks when GTID_NEXT is fixed.
Administrators sometimes set GTID_NEXT='UUID:NUMBER' to apply a specific event, then forget to revert it before starting new work.
A procedure called inside a transaction may execute statements that commit implicitly without the caller realizing it.
Changing autocommit during advanced GTID operations can accidentally start a transaction that conflicts with later DDL.
Occurs when GTID_NEXT is NONE but a transaction is attempted.
Raised when a GTID value string exceeds the allowed length.
Shows that GTID_MODE cannot be enabled because binary logging is disabled.
Though not GTID-specific, dropped connections during GTID changes can leave transactions hanging.
Yes. If the transaction remains open, GTID execution halts and replication can lag or stop.
No. Statements like DDL always commit implicitly. Place them outside explicit transactions instead.
Yes. It is the default and recommended setting for normal workloads and keeps GTID assignment consistent.
Galaxy highlights session variables and flags DDL inside transactions in real time, letting you correct GTID settings before execution.
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