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Documentation > MAC-PAC Reference and Help > Technical Support > Key Concepts and Procedures > Recovery Management > Roll Forward Procedures

Roll Forward Procedures

 

 

This section describes how to Roll Forward Transactions in Archived Journal Receivers.

If a disk failure or damaged file makes it necessary to restore from backup, the roll forward procedure is used.  After the affected files have been restored from the most recent backup, all subsequent journal receivers that were backed up are also restored.  (In the case of a disk failure, all journal receivers that have not been backed up will be lost.)  The roll forward procedure then re-applies the journal entries to the files, and reports any unsuccessful attempts to roll a transaction forward.  To execute the roll forward, the following procedures are performed.  The procedures are illustrated here.

Rollforward Processing

 

 

Display Recovery Management Menu

1.   Display the Recovery Management Menu by selecting Recovery Management from the System Processing Menu.

Restore Master File

2.   Select the Restore Data Library option.  The Data Library Restore Screen is displayed.  For a description of this and the following screens, see the Screens section.

 

3.   Enter the Version Number of the most recent master file backup, and press the ENTER key.  The Recovery Management Menu is redisplayed.

Restore Journal Receiver(s)

4.   Select the Restore Receiver option.  The Journal Receiver Restore Screen is displayed.

 

5.   Enter the name of each journal receiver that has been backed up since the last backup of the data library.  Press the ENTER key after each name is entered.  The Recovery Management Menu is redisplayed; the Restore Receiver option must be selected again to enter each subsequent journal receiver name.

Determine First Journal for Roll Forward

6.   Select the Roll Forward option.  Enter the name of the first journal whose entries are to be re-applied to the file(s).  (This will be the first journal that was backed up after the data library backup or, in some cases, the currently attached receiver.)  Press the ENTER key.  The Recovery Management Menu is redisplayed.

Await Roll Forward

7.   The roll forward procedure scans the journal entries for any file operations that would prevent the roll forward.  If no such entries are found, all record updates are re-applied to the master file(s).  For a more detailed account of this processing, see the section in this manual on Recovery Management Job Streams.

Check Reports

8.   If the roll forward was successful, the Roll Forward Report (RM300) is produced.  This report contains a sequential list of all transactions that were re-applied to the file(s).  Examine this list for accuracy.  Any transactions that were not successfully re-applied are printed on the Roll Forward Exception Report (RM301).  The user must determine how these transactions will be handled.  For a description of the above reports, see the Reports section.

Return

9.   Enter option 98 to return to the System Processing Menu.