Entering content frame

Background documentation ROLLBACK Locate the document in the library structure

When it executes a ROLLBACK, the database system undoes all changes that were executed by a transaction in the database instance. To do this, the database system uses the transaction's undo log entries. The database system then releases all locks that have been allocated to the transaction, implicitly deletes all results tables that have been generated in the transaction, and opens a new transaction.

Any changes that are have been completed by a COMMIT can no longer be reversed by a ROLLBACK.

In normal database operation, the database system performs the required ROLLBACK actions independently. However, ROLLBACK can also be explicitly requested using appropriate SQL statements.

See also:

Reference Manual, ROLLBACK Statement

Concepts of the Database System, Undo Log Management

 

Leaving content frame