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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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Subject: Mainframe Interview

Q:

If you are current on the owner of a set, what is the difference between an obtain next and obtain first in IDMS?

Answer

No difference. There is a difference between obtain first and obtain next for an area sweep, but not when current on the owner in a set.

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Q:

Is there a application program coding difference between local and central version mode in IDMS?

Answer

No. The mode is specified via the SYSCTL DD card in the JCL.

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Subject: Mainframe Interview

Q:

What are the differences between COBOL and COBOL II?

Answer

There are some differences:


COBOL II supports structured programming by using in line Performs and explicit scope terminators. It introduces new features (EVALUATE, SET. TO TRUE, CALL BY CONTEXT, etc). It permits programs to be loaded and addressed above the 16-megabyte line .  It does not support many old features (READY TRACE, REPORT-WRITER, ISAM, etc.). It offers enhanced CICS support.

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Q:

What divisions, sections and paragraphs are mandatory for a COBOL program?

Answer

IDENTIFICATION DIVISION and PROGRAM-ID paragraph are mandatory for a compilation error free COBOL program.

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Subject: Mainframe Interview

Q:

How do you sort in a COBOL program? Give sort file definition, sort statement syntax and meaning.

Answer

Syntax:


SORT   file-1 ON ASCENDING/DESCENDING KEY key....


USING  file-2


GIVING file-3.


 


USING can be substituted by INPUT PROCEDURE IS para-1 THRU para-2


GIVING can be substituted by OUTPUT PROCEDURE IS para-1 THRU para-2.


 


file-1 is the sort workfile and must be described using SD entry in FILE SECTION.


file-2 is the input file for the SORT and must be described using an FD entry in FILE SECTION and SELECT clause in FILE CONTROL.


file-3 is the outfile from the SORT and must be described using an FD entry in FILE SECTION and SELECT clause in FILE CONTROL.


file-1, file-2 & file-3 should not be opened explicitly.


 


INPUT PROCEDURE is executed before the sort and records must be RELEASEd to the sort work file from the input procedure.


OUTPUT PROCEDURE is executed after all records have been sorted. Records from the sort work file must be RETURNed one at a time to the output procedure.

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Subject: Mainframe Interview

Q:

Specify the CICS command used to read a VSAM record starting with prefix F. Code all the relevant options?

Answer

EXEC CICS READ


DATASET('FILENAME')


INTO(data-area)


RIDFLD(data-area)


KEYLENGTH(1)


GENERIC


LENGTH(WK-LEN)


END-EXEC.

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Subject: Mainframe Interview

Q:

The EIB field which gives the last CICS command executed is?

Answer

EIBRCODE

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Subject: Mainframe Interview