(1) A VSAM data set that contains name and status information for DB2 for z/OS and relative-byte address-range specifications for all active and archive log data sets. It also contains passwords for the DB2 for z/OS directory and catalog and lists of conditional restart and checkpoint records.
(2) A VSAM data set that contains an inventory of all active and archived log data sets known to WebSphere MQ for z/OS, and a wrap-around inventory of all recent WebSphere MQ for z/OS activity. The BSDS is required to restart the WebSphere MQ for z/OS subsystem.