<p>The warning signals that DROP TEMPORARY TABLE actions inside the current transaction cannot be reversed by ROLLBACK.</p>
<p>MySQL Error 1752: ER_WARNING_NOT_COMPLETE_ROLLBACK_WITH_DROPPED_TEMP_TABLE means the server could not roll back DROP TEMPORARY TABLE operations issued inside the transaction. Move the DROP outside the transaction or COMMIT before dropping to remove the warning.</p>
Some temporary tables were dropped, but these operations
MySQL error 1752 ER_WARNING_NOT_COMPLETE_ROLLBACK_WITH_DROPPED_TEMP_TABLE fires when a transaction issues ROLLBACK but MySQL cannot fully undo changes because one or more temporary tables were dropped inside the same transaction.
Instead of aborting the whole rollback MySQL emits a warning, letting the transaction finish while informing you that the drop operations on those temporary tables are permanent.
Understanding this warning is important, because assuming a successful rollback could leave your session in an unexpected state and cause data drift in downstream logic or automation.
The warning appears whenever you create temporary tables inside a transaction and then drop them before issuing ROLLBACK. MySQL treats the DROP TEMPORARY TABLE statement as implicit commit like for that object, which cannot be undone later.
It can also surface if the server crashes during rollback or if you manually drop the temporary tables from another session, leaving InnoDB without the metadata needed to revert the operation.
Fix the warning by removing DROP TEMPORARY TABLE statements from transactional blocks, or by committing before dropping the temporary objects.
If you must clean up temporary tables inside a transaction, wrap the logic in a stored procedure that commits and starts a new transaction before the drop.
Alternatively convert temporary tables to derived tables or Common Table Expressions so no explicit drop is required.
Analytics queries that stage data in a temporary table and roll back on failure often hit this warning. Move the drop to an ensure block outside the transaction.
ETL jobs that reuse session wide temporary tables can avoid the problem by adding IF EXISTS guards and committing after each batch.
Keep temporary table lifecycle outside long running transactions. Commit early, drop later.
Switch to WITH clauses or memory tables when possible.
In Galaxy, you can run ad hoc temp table logic in separate editor tabs, preventing accidental mixing of DROP statements and transactional rollbacks.
Executing DROP TEMPORARY TABLE before ROLLBACK makes the drop permanent, triggering the warning.
A crash while the storage engine is undoing changes can leave orphaned temp table metadata that cannot be reverted.
Another session dropping your temporary tables during your transaction stops InnoDB from completing a full rollback.
Occurs when a MyISAM table becomes corrupted; unlike error 1752 it blocks any access until repaired.
Signals a timeout while waiting for locks inside a transaction, often co appearing with temp table usage.
Indicates a cyclical lock dependency that forces InnoDB to roll back a statement, not just warn.
The primary data changes inside the transaction are rolled back, but the DROP TEMPORARY TABLE operation remains committed.
Ignoring it risks leaving application logic believing the temp table still exists. Always review and refactor the offending code.
The warning is present in MySQL 5.7, 8.0 and MariaDB forks that follow InnoDB transaction semantics.
Galaxy highlights warnings directly in the result pane and lets you refactor queries with its AI copilot to move DROP statements outside transactions.
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