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Background documentation Redo Log Entry Locate the document in its SAP Library structure

Redoing (rolling forward) a transaction means that the modifications of a successful transaction are repeated, that is to say, the database is set to the consistent state that it had after the transaction had ended. The redo action means that additional, redundant data management is required.

Therefore, for each transaction, the values of the changed objects are recorded. These logged values are called redo log entries (or after-image entries).

Redo log entries do not need to be saved permanently in the log area until the  COMMIT is executed for the transaction  (Redo Log Management).

The redo log entries are also required for the redo when the database system is restarted or recovered.

See also: Undo log entry

 

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