Automatic deletion of extraneous records

When the RECON data set is notified of an image copy, it may delete or reuse the oldest in-use IMAGE record, and a later IMAGE record becomes the oldest IMAGE record. RECOV and REORG records with start times earlier than the (now) oldest IMAGE record, and ALLOC records with DEALLOC times earlier than the earliest time, are now extraneous, and are deleted from the RECON data set. This is the image copy cleanup process.

When extraneous IMAGE records are deleted from the RECON data set, all active ALLOC records are updated to the time of the first log volume necessary for recovery, based on the oldest image copy for the DBDS or area. When the cleanup process deletes an extraneous ALLOC record, it changes the state of the associated LOGALL records. After all the ALLOC records associated with the LOGALL record have been deleted (this may take place over many image copies for many databases), the PRILOG record associated with the LOGALL record becomes inactive.