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Q:

What is IMS (DB/DC)?

Answer

IMS (Information Management System) is IBMs hierarchical database management system. It has mainly two components: IMS DB and IMS DC (Also know as IMS TM)


IMS DB - IMS/Database Manager as the name implies manages the IMS databases. It is used for physical storage creation and management and data retrieval.


IMS DC / IMS TM - IMS/Data Communications or IMS/Transaction Manager handles online transaction processing system.

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Subject: Mainframe Interview

Q:

How can we distinguish between an online and batch program in IMS environment?

Answer

If in application program IO-PCB is there then it is a online program. In ENTRY statement IO-PCB must be listed first and then DB-PCB.

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Q:

What are the different types of VSAM files available?

Answer

ESDS: Entry Sequence Data Set


KSDS: Key Sequence Data Set


RRDS: Relative Data Set

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Q:

What are the three levels of definition for the VSAM DEFINE?

Answer

They are DEFINE CLUSTER, DATA and INDEX.

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Q:

How do you fix the problem associated with VSAM out of space condition?

Answer

Define new VSAM dataset allocated with more space.


Use IDCAMS to REPRO the old VSAM file to new VSAM dataset.


Use IDCAMS to ALTER / RENAME the old VSAM dataset to DELETE the old VSAM datset.


Use IDCAMS to ALTER / RENAME the new VSAM dataset to the name of the original VSAM dataset.

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Q:

What is a VSAM slot?

Answer

A relative record dataset (RRDS) consists of a specified number of areas called slots. Each slot is identified by a relative record number (RRN) which indicates its relative position in the file.

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Q:

Assuming that the DEFINE JCL is not available, how do you get info about a VSAM files organisation?

Answer

Use the LISTCAT command.

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Q:

During processing of a VSAM file, some system error occurs and it is subsequently unusable What do you do?

Answer

Run VERIFY.

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