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 ROLLBACK 

In a ROLLBACK, all the changes made by a transaction or a subtransaction in the database instance are canceled. Any locks assigned to the transaction are released. All result tables generated within the current transaction are deleted implicitly and a new transaction is opened.

Changes closed with a COMMIT can no longer be reversed with a ROLLBACK.

In normal database operation, the database system performs the required ROLLBACK actions without user interaction. However, a ROLLBACK can also be explicitly requested using appropriate SQL statements (see Reference Manual under ROLLBACK Statement).

 

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