IBM - MVS Interview Questions & Answers

Question 1. What Is Pdes?

Answer :

PDS can extend 15 time after it is allocated. PDSE can extend 122 times.

Question 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?

Answer :

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.

Question 3. How Many Register We Are Using In Mvs?

Answer :

16 - GPR
16 - Access Registers
16 - Control Registers
1 - Special Register called PSW
4 - floating-point Registers

Question 4. What Is Full Form Of Spool?

Answer :

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.

Question 5. What Is Basic Difference Between "directory" And "pds" In Ibm Mainframe?

Answer :

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.

Question 6. How To Define A Directory And What Is The Structure And Definition For The Same?

Answer :

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

Question 7. What Are The Sub Parameters For Undo Command? How Does It Work?

Answer :

TYPE RECOVERYON on command prompt then UNDO command enable.

UNDO command is used to it rollbacks previous data.

Question 8. What Is The Output Of The Following Command Given In Tso/ispf Terminal? Srchfor Abc Srchforc Xyz, (+5)

Answer :

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).

Question 9. How To Send A Sms To A Mobile Through Mainframe Mvs?

Answer :

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.

Question 10. How To Create A New Pds With The Structure Of An Existing Pds?

Answer :

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...

Question 11. What Is The Panel Name Of Ispf Primary Option Menu?

Answer :

Panel name is ISPf/PDF primary option menu

Question 12. What Is The Facility That Allows Mainframes To Be Partitioned Into Lapars? A.z/os B.pr/sm C.vitual Storaged.coupling Facility

Answer :

1. Z/os
2. PR/sm
3. Vitual storage
4. Coupling facility
5. PR/sm

Question 13. What Is Swap-in And Swap-out?

Answer :

Swap-in and Swap-out is the transfer of all valid pages between auxiliary storage to real storage and vice-versa.

Question 14. What Is Address Space In Mvs?

Answer :

Address space is the range of addresses in real storage.

Question 15. What Is The Size Of The Address Space In Kbs For 16 Bit Address Space?

Answer :

The size of address space for 16 bit address space is 64kb

For s/370 the address space 21 bit- 16MB
For s370XA and EXA address space is 31 bit- 2GB

Question 16. What Is Basic Difference Between "directory" And "pds" In Ibm Mainframe?

Answer :

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.