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What is the difference between specifying DISP=OLD and
DISP=SHR for a dataset?
 Question Submitted By :: JCL
I also faced this Question!!     Answer Posted By  
# 1
OLD specifies exclusive use of a dataset, SHR allows
multiple jobs to concurrently access the dataset Note: When
updating a dataset, you would normally use OLD.
Is This Answer Correct ?    26 Yes 2 No
# 2
disp=old means at the time of execution another job can't
use that file.after completion of job another job can use.

disp=shr at the timeof exection many user can use in read
Is This Answer Correct ?    14 Yes 0 No
Shailendra 2008
# 3
Read from beginning of dataset. But if u write, then it
will overwrite on existing data. i.e old data is lost.
Is This Answer Correct ?    7 Yes 2 No
# 4
Generally DISP = OLD is used when a Dataset is generated in
a step of job and then subsequently used in the next up
coming steps of the same job ,
DISP=SHR signifies that the dataset is can be shared by the
multiple jobs.
Is This Answer Correct ?    8 Yes 6 No
# 5
disp= old will give exclusive use of dataset.
disp= shr....multiple job can use the dataset concurrently..
but in both case, while writing , it will overwrite to old
dataset..i.e, old data will be lost.
Is This Answer Correct ?    2 Yes 0 No

Other JCL Interview Questions
  Question Asked @ Answers
How different is the JCL executing a COBOL program? 1) if the program is using VB file as input. 2) if the program is using FB file as input. HSBC 1
What is Automatic Restart ? EXEC PGM = PROG1, RD = R (Is it the Restart of a JOBSTEP or Restarting the execution of the program?) Do we Restart it or it automatically Restarts executing again and again ? Then when it will finish executing ? or After Abending, when we submit it again, then it is Restarted from the Last successful Checkpoint ? If some JOBSTEP is abending, what is the benifit to Restart it, WILL IT NOT ABEND AGAIN if you don't change the LOGIC ? IBM 1
I have multiple jobs ( JCLs with several JOB cards ) in a member. What happens if I submit it?   16
what is the default region size if I dont specify region parametre in my job card ( I know that if I specify region=0k or 0M, then the job will occupy all he available resources at the time of job execution), but I want to know the defult value for "region" paramatre. BirlaSoft 5
What is maximum length of block size? Kanbay 4
how to allocate a dynamic dataset in jcl ? Patni 3
how to convert a file form fixed Length to variable length? Syntel 2
If a jcl has just 1 step and the input file to this does not exist, then what will happen if we submit this job?   3
How to identify in JCL that an input file is empty without reading it? L&T 3
i have 3 steps in my jcl, where i want to run only one step at a time depending on the variable. How should i give the condition statement... I have tried this with two steps which is working but not able to add condn for the 3rd step. can anyone help me... I want to know the cond stmt which i can code in step 3 and step4, so that only either step2 or step3 or step4 executes   3
What happens if both JOBLIB and STEPLIB is specified ?   8
What does SYSIN * indicate?   2
For more JCL Interview Questions Click Here 

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