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

in a jcl, a large volume dataset is loaded to a table using bmcload in step1 and an image copy of the loaded table is taken using bmccopy in step2. Step2 abends because the image copy dataset cannot hold the volume of the table. How can this be rectified?

0 Answers   IBM,

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A maximum of 100 chars can be passed to Cobol through Parm in JCL, If we want to pass more than 100 Chars how we can do it ?

3 Answers   IBM,

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can we copy a file from fixed block to variable block and vice versa ....asap

1 Answers  

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I have an job having three job steps.Suppose i want to call a pgm in step2 and aproc in step3.How to write the code?

2 Answers   IBM,

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wht happens if blksize = 0 and lrec = 0 ?

1 Answers   TCS,

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Is automatic restart possible in jcl? If yes, how?

0 Answers  

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if we give two job cards in a single what happens

3 Answers   IBM,

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How to delete generations of gdg without deleting gdg base?

3 Answers  

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WHAT WILL HAPPEN TO A FILE IF DISP=(MOD,DELETE,DELETE)

8 Answers   ADP,

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What is the difference between catalogue procedure and In-Stream procedure?

2 Answers  

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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.

5 Answers   BirlaSoft, Infosys,

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I had 100 steps in jcl i want to execute first 10 steps only?

6 Answers   IBM,

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