SQL statements in a procedure or trigger are part of the current transaction. You can call several procedures within one transaction or have several transactions in one procedure.
COMMIT and ROLLBACK are not allowed within any atomic statement. Note that triggers are fired due to an INSERT, UPDATE, or DELETE which are atomic statements. COMMIT and ROLLBACK are not allowed in a trigger or in any procedures called by a trigger.
Savepoints can be used within a procedure or trigger, but a ROLLBACK TO SAVEPOINT statement can never refer to a savepoint before the atomic operation started. Also, all savepoints within an atomic operation are released when the atomic operation completes.
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