What is GDG?
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
Is This Answer Correct ? | 3 Yes | 0 No |
How can the disposition of sysout datasets be set for an entire jobstream?
Why include statement is used in a jcl?
When we give TYPERUN = SCAN , what are the syntax errors we get?
what happens if job falls in loop ? how to resolve it ?
Name a few IBM utility programs, and explain its function.
is there any possibilities for sumbitting more than one job in single jcl? if yes...based on which thing they will execute..(priority,class,time,written order..?)
What will happen when we try to pass data from JCL to COBOL using PARM parameter without declaring the length field in Linkage Section?
What is a GDG
SORT card to eliminate duplicity.
How can a stopped job be started again?
what if any ,is the syntax error in the following piece of code 01 B PIC A(7) 02 C PIC 9(4) ........ IF(B NUMERIC) ADD 10 TO C a.the condition in the if statement is wrong b.noting is wrong c.because C is initialised.ADD 10 TO C is wrong d.both B and C shoud have same size.
What are the difference between jcl and jes?