Answer / guest

GDG - group of dataset that are logically or chronologically
related, referred by name and a relative generation number -
an integer which identifies the generation of a dataset and
is coded in parentheses after dataset name. Absolute GDG
name - GxxxxVyy, where xxxx-absolute gen. number, yy-version
number. Can be sequential, direct, partitioned. (VSAM - no).
Must always be cataloged. Advantage - all datasets have the
same name and system keeps track of adding new and retaining
previous generations and deleting oldest successive
generation. To create a GDG we create a GDG index in the
system catalog with IDCAMS utility and then a model
(prototype, DSCB) on the same volume to supply DCB
information. Empty - when limit is reached all members are
removed from the index, otherwise-only oldest.
Scratch-removed members are uncataloged & deleted, otherwise
- removed & uncataloged, but remain in the system (not
members of GDG any more). GDG number is updated at the end
of the job. If number is not specified all generations will
be processed from the beginning

a set statement is used to define commonly used symbolic across job steps or procedures. It initializes the previous values in the symbolic names. It has to be defined before the first use of the symbolic names in the jcl. State whether true or false?

0 Answers   IBM,

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If i am going to change some variable in a copybook( size or variable type) ,what are the changes that need to be done in the corresponding JCL.

4 Answers   IBM,

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what's the significance of freespace(0 0) and freespace(100 100)

3 Answers  

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how you can direct the data to spool using SYSOUT option?

0 Answers  

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1) Is CLASS used for assigning Priority (as we say a job having class '6' will run before the job having class '5'? then what is the difference between CLASS and PRTY ? 2) In a same JCL, 2 JOB statements with different Classes and NO PRTY are submitted ? which will run first ? & with different classes and different PRTY also, which will run first now ?

3 Answers   IBM,

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How do you restart a PROC from a particular step?

5 Answers  

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Explain the function of a dd statement?

0 Answers  

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what is A-MODE and R-MODE?

2 Answers  

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I have two input files i/p1 name id-key flag date i/p 2 name id-key date if id-key matches in the both the files then it should write the output file from i/p1 with flag 'Y'. It should be done thru JCL sort card ,Please provide the info on this. ---Note : output file should have all records from i/p1 with proper Flag.

2 Answers  

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At what stage, operator can change the class and priority of a submitted job?

2 Answers  

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What is the purpose of the dd keylen parameter?

0 Answers  

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What is the difference between a symbolic and an override in executing a PROC?

2 Answers  

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