CICS® VR CA reduces the time it takes to perform a forward recovery.
CICS VR CA consolidates forward recovery log records into a CA data set. CICS VR uses the CA data set in conjunction with the forward recovery log to reduce the number of log records that CICS VR needs to apply to return the sphere to the exact state before the data was lost.
CICS VR change accumulation consolidates all log records written for VSAM spheres since their latest backups were taken. The consolidated log records are then written to a change accumulation data set. For example, if 100 updates were made to the same record in a VSAM sphere, this would produce 100 after-image log records. CICS VR change accumulation processing can then sort and filter these log records, copying only the most recent after-image into the CA data set. CICS VR then can use this CA data set (instead of reading the 100 after-images) during forward recovery processing.
CA is a two step process. The next two sections cover both of these steps.