IBM MVS Interview Preparation Guide
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IBM MVS frequently Asked Questions by expert members with experience in IBM MVS. So get preparation for the IBM MVS job interview

15 IBM MVS Questions and Answers:

1 :: What is PDES?

PDS can extend 15 time after it is allocated. PDSE can
extend 122 times.
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2 :: WHAT IS DIFFEENCE BETWEEN PDS AND PDES?
STEPS BEFORE MERGING?
DUMMY DATASET USES?
DIFFERENCES BETWEEN IDCAMS AND ICETOOLS?
DIFFERENCE BETWEEN ALL JCL UTILITY TOOLS?

dummy dataset means it dont have any control fields. so,we
place a dummy

ex:SYSIN DD DUMMY(NO FUNCTION).

JCL UTILITY TOOLS:

IEBGENER UTILITY:

IT IS USED TO CREATE,COPY OR PRINT SEQUENTIAL DATASETS.

IEBCOPY UTILITY:

I IS USED TO COPY NUMBERS OF PARTITIONED DATASETS.

IEFBR14 UTILITY:

THIS UTILITY IS CALLED DUMMY UTILITY ALSO BY USING THIS
UTILITY WE CAN CREATE A DATASET.
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3 :: How many register we are using in mvs?

16 - GPR
16 - Access Registers
16 - Control Registers
1 - Special Register called PSW
4 - floating-point Registers
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4 :: What is full form of SPOOL?

To spool means "to operate (an input/output device) by
using buffers in main and secondary storage. "

Not sure if there is any full form.

If you meant SDSF, it stands for sytem display and search
facility.
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5 :: What is basic difference between "DIRECTORY" and "PDS" in IBM MAINFRAME?

A PDS or Partitioned Data Set is a dataset containing
multiple members, each of which holds a separate sub-data
set, similar to a directory in other types of file systems.
This type of dataset is often used to hold executable
programs (load modules), source program libraries
(especially Assembler macro definitions). A PDS is most
somewhat analogous to a Zip file on microcomputers, except
the files stored in a PDS are not compressed.

The Partitioned Data Set can only allocate on a single
volume with the maximum size of 65536 tracks.

Besides members, a PDS consists also of their directory.
Each member can be accessed directly using the directory
structure. Once a member is located, the data stored in
that member is handled in the same manner as a PS
(sequential) data set.
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6 :: How to define a DIRECTORY and what is the
structure and definition for the same?

As in DIRECTORY we can store files as well as another
DIRECTORY which includes other files but PDS includes only
mebers not another PDS inside it.
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7 :: What are the sub parameters for UNDO command? How does it work?

TYPE RECOVERYON on command promt then UNDO command enable.

UNDo command is used to it rollbacks previous data.
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8 :: What is the output of the following command given in TSO/ISPF terminal?

SRCHFOR abc SRCHFORC xyz, (+5)

SRCHFOR 'abc' search for abc in the current PDS or LIBRARY.

SRCHFOR C 'xyz', (+5) search for 'xyz' and (+5) in
continuation (i.e. in the same line only).
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9 :: How to send a SMS to a mobile through Mainframe MVS?

SMS in mainframe is Storage Management System. I hope it has
nothing to do with telephone SMS.

Regarding the Storage Management System, I can say something
soon.
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10 :: How to create a new pds with the structure of an existing pds?

You can create a new pds with file aid 3.2.
Here the question is, same structure of an existing pds.
it is easy to note down the structure and type it again
while allocating a daataset, but what is the shortest form
of doing this is the question...
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