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Q:

What are the steps you go through while creating a COBOL program executable?

Answer

DB2 precompiler (if embedded sql used), CICS translator (if CICS program), COBOL compiler, Link editor. If DB2 program, create plan by binding the DBRMs.

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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:

What are different file OPEN modes available in COBOL?

Answer

Open for INPUT, OUTPUT, I-O, EXTEND.


1.INPUT : for read only purpose


2.OUTPUT : for write only purpose


3.EXTEND : for appending records


4.I-O : for read and write(using EXTEND) purpose

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Subject: Mainframe Interview

Q:

How do you define a sort file in JCL that runs the COBOL program?

Answer

Use the SORTWK01, SORTWK02,..... dd names in the step. Number of sort datasets depends on the volume of data being sorted, but a minimum of 3 is required.

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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

Q:

What CICS command do you need to obtain the user logon-id?

Answer

You must code EXEC CICS ASSIGN with the OPENID option.


 

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Subject: Mainframe Interview

Q:

Name some of the common tables in CICS and their usage?

Answer

PCT (Program Control Table) - Defines each transaction containing a list of valid transaction identifiers (transid) where each transaction is paired with its matching program.


PPT (Program Processing Table) - Contains a list of valid program names and maps and whether a current version is in the CICS region or needs to be brought in as a new copy.


FCT (File Control Table) - Contains a list of files known to CICS, the dataset name and status (closed/open, enable/disabled)


TCT (Terminal Control Table)- A list of the terminals known to CICS.

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Subject: Mainframe Interview