Registering databases and database data sets

The RECON data set must have a DB record for each database whose recovery DBRC is to control.

If you want DBRC to control database recovery, you must register the databases in the RECON data set. DBRC then records information about database updates and about the corresponding log data sets that contain updated log records. DBRC also records the creation of image copy and change accumulation data sets, and records database recoveries and reorganizations that affect registered databases.

For non-HALDBs (High Availability Large Databases), use the INIT.DB and INIT.DBDS commands to register databases in the RECON data set and to define them as recoverable or nonrecoverable. For HALDBs, you can use the INIT.DB and INIT.PART commands, or the HALDB Partition Definition utility.

For each non-HALDB database that you have registered, issue the INIT.DBDS command to register all its data sets or DEDB areas. For DEDBs, use the INIT.ADS command to identify the data sets within each area. An area can have up to seven area data sets (ADSs).

Requirement: Utility jobs that issue either an INIT.DB or INIT.PART command (to register a HALDB) or any INIT.DBDS command, require a DD name for the IMS.DBDLIB data set that contains an entry for the HALDB DBD (or non-HALDB DBDS) for which you are issuing the command. A DD name for the IMS.DBDLIB is not needed for non-HALDB command.

From a DBRC perspective, a HALDB consists of a HALDB master (TYPE=HALDB) and HALDB partitions (TYPE=PART).

To update or delete information about HALDBs in the RECON data set, you can use the HALDB Partition Definition utility or the following DBRC commands; CHANGE.DB, CHANGE.DBDS, CHANGE.PART, DELETE.PART, or DELETE.DB.

Related reading: 
  • See IMS Version 15.4 Database Administration for an overview of HALDBs and detailed information about how to create them.
  • See IMS Version 15.4 Database Utilities for information about the HALDB Partition Definition utility.
  • See IMS Version 15.4 Commands, Volume 3: IMS Component and z/OS® Commands for information about the CHANGE commands and specifics about the INIT commands.