References to ACB, DBD, and PSB resources when ACBs are managed by IMS
When the IMS management of ACBs is enabled, IMS procedures no longer need to reference the ACB, DBD, or PSB libraries. Instead, IMS retrieves these resources from the IMS catalog when they are needed.
To retrieve the resources from the IMS catalog, IMS procedures must either reference the DFSDFxxx PROCLIB member that contains the IMS catalog specifications or an IMS Catalog Definition exit routine (DFS3CDX0) must be supplied that provides the specifications.
When IMS manages ACBs, IMS ignores references in JCL to the ACB, DBD, and PSB libraries for
utilities, programs, or IMS components that run in the following regions or environments:
- An offline DL/I batch processing region that is established by the DBBBATCH procedure
- A DBCTL environment that is established by the DBC procedure
- A DCCTL environment that is established by the DCC procedure
- A DL/I separate address space that is established by the DLISAS procedure
- A FDBR address space that is established by the FDR procedure
- A IMS DB/DC environment that is established by the IMS procedure
- Online dependent regions that use GSAM
- ULU (unload and reload) regions