DBRC and protecting data

DBRC provides database-level (level 1) data sharing and database-level protection after a failure occurs. DBRC prevents conflicts in database allocation that could compromise database integrity. DBRC uses the RECON data set to record information about each database authorization it grants to IMS subsystems, and to indicate whether a subsystem is updating a database.

DBRC removes this indication when any of the following occur:

• The subsystem terminates normally.
• Dynamic backout completes after a failure.

If an IMS subsystem fails during an update, the RECON data set still indicates this incomplete update. DBRC does not grant additional database authorizations unless the IRLM retains locks that protect the incomplete changes.