<p>This warning appears when a ROLLBACK cannot remove temporary tables created in the same transaction, leaving them in the session.</p>
<p>MySQL Error 1751: ER_WARNING_NOT_COMPLETE_ROLLBACK_WITH_CREATED_TEMP_TABLE occurs when a ROLLBACK fails to drop temporary tables created during the transaction. Drop the tables or reconnect to clear the session, then refactor code to avoid temp table creation inside multi-statement transactions.</p>
The creation of some temporary tables could not be rolled
The full message ER_WARNING_NOT_COMPLETE_ROLLBACK_WITH_CREATED_TEMP_TABLE: The creation of some temporary tables could not be rolled back appears as a warning after executing ROLLBACK.
MySQL raises it when a transaction that created one or more temporary tables cannot drop them during rollback. Data changes are undone, but the temp tables persist in the current connection.
Leaving these tables in place wastes memory and may confuse later queries, so resolving the issue promptly is essential.
The warning arises when temporary tables are created inside a transaction and MySQL cannot automatically remove them because DDL is auto-committed or locks prevent cleanup.
It also surfaces if the connection loses context, server resources are low, or transactional DDL support differs between engines.
List leftover temp tables with SHOW TABLES or INFORMATION_SCHEMA.TEMP_TABLES, then DROP each one explicitly.
If the session remains unstable, disconnect and reconnect to start fresh.
Modify application logic to create temp tables outside explicit transactions or COMMIT immediately after their population.
ETL scripts that stage data in temp tables within long transactions often hit this warning. Commit after staging to avoid it.
Stored procedures containing CREATE TEMPORARY TABLE followed by ROLLBACK will trigger the warning. Add DROP TEMPORARY TABLE IF EXISTS at procedure end.
Keep temp table lifecycles short and explicit. Do not mix heavy DML and DDL inside the same transaction.
Monitor PERFORMANCE_SCHEMA memory views to spot sessions holding large temporary table buffers.
Error 1194 - Table is marked as crashed can appear after abrupt session termination; repair or recreate the table.
Warning 1287 - Statement is deprecated signals outdated syntax that may conflict with transactional DDL handling.
Creating temp tables within START TRANSACTION makes automatic cleanup on ROLLBACK unreliable.
InnoDB auto-commits DDL, so subsequent ROLLBACK cannot revert table creation.
Network glitches during rollback leave temp tables orphaned and trigger the warning.
Indicates table corruption often following abrupt disconnection.
Appears when outdated syntax is used, potentially affecting transactional DDL.
A DDL error that may arise when altering temp tables inside transactions.
No. Data changes are reverted. Only the temporary tables remain in the session.
Ignoring it leaves temp tables consuming memory and may confuse later queries. Always drop them or reconnect.
Temporary tables are connection scoped. MySQL supports them inside transactions, but DDL auto-commit rules limit rollback.
Galaxy flags the warning instantly and lets you run DROP statements or refactor code in the same editor tab.
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