The forward recovery data set (RDS) stores the SYSOUT data that is archived during and after a backup cycle (standard or interim). It also stores the master control records (MCR), tape control records (TCR), and group control records (GCR) of the database.
If an RDS becomes full, the CA View archival task automatically creates a new RDS with the next sequential number. The starting and ending RDS numbers are tracked in the database.
When a CA View backup begins, a new RDS with the next sequential number is automatically created. When the backup has successfully completed, the RDSs that contain data from before the current backup are deleted.
When SARDBASE RESTORE runs, it determines if there are any active RDSs. If active RDSs are found, RESTORE copies the SYSOUT data from the RDSs to the database it has restored automatically.
Forward recovery enables successful recovery from an unlimited number of nested failures, including failures which can occur during the recovery process.
Each RDS begins with control information. Because a SYSOUT group can consist of multiple JES data sets, the control information includes a pointer to the end of the last successfully stored JES data set.
If you want to restart the interrupted CA View started task, the forward recovery data set storage process resumes with the JES presented next data set. If the interruption occurred while CA View was processing a JES data set in the middle of a SYSOUT group, JES presents the same "middle" data set to the CA View archival started task. The forward recovery data set storage process correctly appends that data set to the data sets that preceded it.
|
Copyright © 2015 CA Technologies.
All rights reserved.
|
|