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some interview questions

 
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lakshmibala

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Joined: 16 Jun 2004
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PostPosted: Fri Jul 16, 2004 12:13 pm    Post subject: some interview questions
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hi all,

Can any of my friend give the answer for the following question and clear my doubt


1. IN VSAM , SUPPOSE THERE R 1 BILLION RECORDS AND U WANT TO RETRIEVE LAST 10 RECORDS. HOW DO U CODE FOR THAT ?

2.IF TWO PERSONS R MAKING CHANGES TO THE SAME PROGRAM AND IF THEY SEND THOSE PROGRAMS TO THE PROJECT LEADER, WHOSE PROGRAM WILL BE CONSIDERED FIRST ?

3.WHAT FOR REVOLVE ? WHAT FOR U USED IT IN UR PROJECT ?

4.TELL ABOUT CURSOR IN UDB.

5.HOW DO U HANDLE IF U HAVE A SITUATION LIKE , U HAVE TO COMPLETE UR CODING IN 10 DAYS OUT OF THIS 7 DAYS GOT OVER, NOW IF UR LOGIC IS CHANGED , HOW DO U IMPLEMENT IT ?

6.WHAT IS COMPILATION ERROR U GET IF WE SPECIFY PIC ON RENAME ?


7.SUPPOSE THERE IS A COMPILATION ERROR. IN WHICH DATASET DO U FIND COMPILE LIST AND WHERE? And what kind of dataset is it?


8.WHAT OTHER OPTIONS YOU HAVE TO SET THE TIME OPTION OTHER THAN TIME PARAMETER IN JOB ST?


9.SUPPOSE IF I GIVE DIFFERENT PROGRAM-ID AND SAVE THE PROGRAM IN DIFFERENT NAME AND COMPILE THE PROGRAM. WHAT WILL I GET ANY ERROR?


10.SUPPOSE UR CICS MAP HANGS AND IT IS NOT ACCEPTING ANY CONTROL FROM KEYBOARD WHAT WILL U DO ?


bye with regards,

lakshmibala icon_lol.gif
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bluebird

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Joined: 03 Feb 2004
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PostPosted: Fri Jul 16, 2004 12:59 pm    Post subject:
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1. IN VSAM , SUPPOSE THERE R 1 BILLION RECORDS AND U WANT TO RETRIEVE LAST 10 RECORDS. HOW DO U CODE FOR THAT ?

if u know the total # of recs it is easy thru idcams utility (repro infile outfile
skip(# of recs -10) )

7 ) SYSPRINT and should be sysout
9) you won't get any error (the name will be the member name of the load-module)
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anuradha

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Joined: 06 Jan 2004
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Location: Hyderabad

PostPosted: Fri Jul 16, 2004 1:22 pm    Post subject:
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hi bluebird.

for question no:9,do you think program id bearing different name to that of program name affect anything when saved in endevor.

suppose there are two programs A and B. let us assume A has program id as B and B has program id as A. Am I confusing you.ok Now if you save these two programs in endevor though you may not get any error do we face any problem with loadmodules while expediting.

Thanks,
Anu
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sandip_datta

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Joined: 02 Dec 2003
Posts: 151
Location: Tokyo, Japan

PostPosted: Fri Jul 16, 2004 2:56 pm    Post subject:
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For question# 9, we face Link error in prgram HEWL. We use Endevor.

1. IN VSAM , SUPPOSE THERE R 1 BILLION RECORDS AND U WANT TO RETRIEVE LAST 10 RECORDS. HOW DO U CODE FOR THAT ?

If no of records are not sure -
i) Copy VSAM into sequential file.
ii) Sort the seq file in acsdending order based on the VSAM key.
iii) Use repro to copy first 10 records and use those.

5. I can not see any other options than staying office overnight. This is a very common situation in industry.

10.SUPPOSE UR CICS MAP HANGS AND IT IS NOT ACCEPTING ANY CONTROL FROM KEYBOARD WHAT WILL U DO ?
Open a new screen and logon with different ID and purge the transaction throwing the map.
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mmwife

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Joined: 30 May 2003
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PostPosted: Fri Jul 16, 2004 7:32 pm    Post subject:
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Copy a billion recs VSAM file and sort them to get the last 10 recs? I don't think so. That may get you fired. I think that's why the ques was phrased that way.

If you have FileAid try that. It has a facility to point to the last rec in a file and read backwards.

If not, it may make sense to write a quickie CICS trans that issues a START BROWSE cmd with a GT or = high vals then do READ PREVs to get the last 10 recs.

Or you can brush up on your Assembler skills. It can read VSAM files backwards.

Regards, Jack.
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sandip_datta

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PostPosted: Sun Jul 18, 2004 5:57 pm    Post subject:
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Hi Jack,

File aid option is not feasible in practice , I think. In my shop I always get Out of Space error in opening and go to the last portion of records in such a big file.

I think writing a CICS program is always costly compared to some JCL steps in respect of time, effort, performance. Because programs always involve compiling and all those staffs. And so far performance is concerned, SORT is always accepted as compared to open, Close, read file as these operations involve disk read and consumes time.

Assembler is a good option but could you please put the code and then we will be in position to brush out our knowledge also.

Regards,
Sandip.
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bluebird

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Joined: 03 Feb 2004
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PostPosted: Mon Jul 19, 2004 2:12 pm    Post subject:
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anuradha,

I was answering from strictly compile-cobol angle.

I'm not using ENDEVOR with cobol, I compile run and test my own pgms.
does ENDEVOR check program-id in the pgm itself or does it use parm passed by pgmer and/or member name ?

if ENDEVOR uses program-id FROM SOURCE (i.e reads from cobol source)
then you may have problems.
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mmwife

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Joined: 30 May 2003
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PostPosted: Tue Jul 20, 2004 8:01 am    Post subject:
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Hi Sandip,

Have you tried this?
Code:

//GET10  EXEC  PGM=FILEAID
//DD01     DD  DSN=ONE.BILLION.RECS,...
//DD01O    DD  DSN=TEN.RECS
//SYSIN    DD  *
$$DD01 COPYBACK OUT=10


As far as the CICS solution is concerned, could probably writ the xaction, test it, and execute in the time you could read the billion recs. :-)

There's no contest between sort execution and CICS/VASM read prev as far as exec times are concerned.

Regards, Jack.
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sandip_datta

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Location: Tokyo, Japan

PostPosted: Tue Jul 20, 2004 8:14 am    Post subject:
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Hi Jack,
Batch Fileaid is working fine.

But as per as Sort performance is concerned...I have tested it for reading 10 records and with SORT -
For read the Clock is 0.02 and for SORT it is 0.01. I think for more records this difference will be more.

regards,
Sandip.
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mmwife

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Joined: 30 May 2003
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PostPosted: Wed Jul 21, 2004 12:13 am    Post subject:
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Hi Sandip,

I think you misunderstand my point.

If you write a CICS xaction to read the VSAM file backward you only read 10 recs. (And whatever ohead is needed to point to the last rec in the file). The START BROWSE cmd does that for you. From there you use READ PREV cmds to read the last 10 recs in the 1 billion rec file.

Using sort you must read ALL 1 billion recs in the file to get to the end of it.

It's not a per rec thing; it's the number of recs each technique must read.

Regards, Jack.
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