DBCTL and DCCTL

Database Control (DBCTL) supports non-message-driven batch message processing (BMP) programs. Data Communications Control (DCCTL) is a transaction management subsystem that does not support full-function DEDBs or MSDBs (main storage databases), but does support GSAM databases in BMP regions.

DBCTL has its own log and participates in database recovery. Locking is provided by IMS program isolation (PI) or the internal resource lock manager (IRLM).

To access databases in a DCCTL environment, DCCTL must connect to an external subsystem that provides database support.