Database image copy (DFSUDMP0)

The Database Image Copy runs offline. It supports a concurrent image copy (CIC) option that enables you to create an image copy while the database remains online. The CIC option can create image copies of OSAM data sets and VSAM Entry Sequenced Data Sets (ESDSs). The Database Image Copy does not support creating image copies of VSAM Key Sequenced Data Set (KSDSs).

Use the Database Image Copy (DFSUDMP0) utility to create data set copies of:

• HISAM databases
• HIDAM databases
• HDAM databases
• PHDAM (partitioned HDAM databases)
• PHIDAM (partitioned HIDAM) databases
• PSINDEX (partitioned secondary index) databases
• DEDB areas

To request a concurrent image copy, use the CIC keyword on the GENJCL.IC command. Alternatively, you can specify the CIC parameter on the EXEC statement for image copy job. DBRC must be used by the utility and you can only take a concurrent image copy of a database that has been registered with DBRC.

When you run the Database Image Copy utility to take a consistent image copy (CIC option not specified), DBRC is not required but is recommended. DBRC ensures that there is no update activity against the database or area while the utility is executing. If you run the utility without using DBRC you must make certain that no updates occur to the database or area. You can issue a /DBDUMP command or a/STOP AREA command, for example, to prevent updating of the database or area by transactions in the system previously doing updates.