INTERVIEW QUESTIONS MAINFRAME IDMS DETAILS

Question: What is the difference between local and central version operating modes?

Answer: In local there is no IDMS System running above the DBMS. It's the more efficient mode but lacks the recovery and integrity facilities of the central version (CV) control program. In CV many application programs access the database through a single copy of the DBMS.

In local there is no IDMS System running above the DBMS. It's the more efficient mode but lacks the recovery and integrity facilities of the central version (CV) control program. In CV many application programs access the database through a single copy of the DBMS. Source: CoolInterview.com

See the difference between Local mode and Central Version:

Local Mode.

1.A batch program that operates in local mode has its own copy of IDMS DBMS loaded into its partition, region or address space
2.Usually, for the sake of speed, Good for Batch Retrieval programs
3.Local mode operates faster
4.In case of update you need to take areas offline. In this case other users cannot access that database even in retrieval mode
5.Automatic Recovery is not provided. Programmers need to restore the database
6.JCL can run in any region

Central Version (CV).

1.With central version, a single copy of IDMS DBMS controls the operation of a particular set of IDMS application program run unit
2. DCCOBOL/Online programs must use CV only
3.somewhat slow
4. Need not take area offline. Hence other users can access same area at same time
5. Central Version implements facilities for recovering from system failures and for automatically restarting aborted run units
6.JCL must run in particular region


Source: CoolInterview.com

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