Overview of DI+
DI+ works with the IMS control blocks that define the structure and characteristics of IMS systems:
- Database definitions (DBDs)
- Data management blocks (DMBs)
- Program specification blocks (PSBs)
- Program control blocks (PCBs)
- Application control blocks (ACBs)
- Message format service (MFS) message descriptions (MIDs/MODs)
- MFS device formats (DIFs/DOFs)
- IMS online control blocks (MODBLKS)
- IMS dynamic allocation library (DFSMDA) members
- Data Base Recovery Control (DBRC) RECON data sets
The general purpose of DI+ is twofold: to prevent programs from accessing a database with an incorrect control block and to enhance the productivity of programmers and database administrators (DBAs) who manage the IMS control blocks and the libraries that contain them.
DI+ has three major components:
- Integrity Controller
- Library Interrogator
- DI+ user interface
The following sections describe these components.
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