When the database administrator uses MODIFY to delete records from the RECOVERY_UNITS and DA_LOGS catalog tables, the associated SESAM backup copies of the user spaces and the DA-LOG files are not deleted. The same applies in principle to SESAM backup copies of the catalog space and to CAT-LOG files that are no longer required for which the database administrator has deleted the relevant entries from the CAT-REC file with the utility statement MODIFY or using the utility monitor.
It is recommended that SESAM backup copies and log files that are no longer required be deleted from the BS2000 system. Files created on disk can be deleted with the command DELETE-FILE ...,OPTION=*DESTROY-ALL. SESAM backup copies on magnetic tape cartridge constitute part of the associated HSMS archive or ARCHIVE directory and must therefore be deleted with the aid of the software products HSMS or ARCHIVE (see the “HSMS (BS2000)” or “ARCHIVE (BS2000)” manuals respectively).