IMS-DC Introduction
IMS:
IMS is a hierarchical DBMS, supplied by IBM & runs on mainframe computers. It has 2 components.
Data Base (DB) processing
Data Communication (DC) processing
Major kinds of online programs that can be written:
Inquiry programs
Data Entry programs
Maintenance programs
Menu programs
Comparison between online and batch programs:
| Batch System | Online System |
|---|---|
| Pre-determined scheduling intervals | Arbitrary scheduing by users |
| Necessary creation of input files | Processing of data as it occurs |
| Lack of access to current data | Data up-to-date and current and available for inquiry |
| Delay in processing erroneous data | Immediate error creation |
| Databases cannot be shared with other updating programs | Database can be shared with other updating programs |
Software components of an IMS DC system:
IMS-DC offers:
A way to improve customer and interval service by providing current and consistent information
A way to interact with users with critical response times
A way to distribute processing function to different locations
A way to improve productivity for online applications
Features of IMS
Manages IMS-DC terminal network
Routes messages for various destination
Scheduling of messages
Manages resources allocated to IMS
Provides restart, recovery facilities
Interacts with databases for data retrieval and updation
If you have any doubts or queries related to this chapter, get them clarified from our Mainframe experts on IBMMainframer Community!
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