Standard image copy

An image copy in standard image copy format can be either an IMS image copy or a compressed image copy.

IMS image copy

An IMS image copy is a copy of a database or area that reflects the state of the data at a point when no updates were being made.

Image copies can be created in IMS image copy format by the Database Image Copy utility (DFSUDMP0), IMS HP Fast Path Utilities, and IMS HP Image Copy. IMS image copies can be used for recovery purpose with IMS HP Image Copy, IMS Database Recovery Facility, and Database Recovery utility (DFSURDB0).

With IMS HP Image Copy, you can create image copy data sets in IMS image copy format by using the following image copy functions:

  • The standard image copy process
  • The FASTIC DUMP process of Advanced Image Copy Services
  • The FASTIC FDUMP process of Advanced Image Copy Services
  • Offload copy of the FASTIC COPY process of Advanced Image Copy Services. (Image copies in IMS image copy format are created as secondary image copy data sets.)
  • IMS compatible JCL

Compressed image copy

A compressed image copy has the format of database records that are compressed by one of the IMS HP Image Copy compression routines. The advantage of this format is that it reduces allocation space for output image copies.

The functions of IMS HP Image Copy support the data sets that are in compressed format. Compressed image copies reduce the number of tapes that are needed to record the image copies.

The Image Copy function can generate image copies in compressed format. When image copies are compressed, you can decompress them by specifying the image copy as input for the Recovery function for a database recovery job or by specifying the image copy as input for the Create Image Copy function to create new image copy data sets.