CA Dynam for VSE User Guide

Controlling Generation Data Sets
// DLBL SDDINP,'DISK.FILE (D,I)'
// EXTENT SYS005,POOL01,1,0,1,1
// DLBL SDDOUT,'TEMP.FILE (I)',1,SD
// EXTENT SYS006,POOL01,1,0,1,16
// EXEC PROGRAM
CADD002I ALLOCATED FILE=SDDOUT SYS006=201 SYSWK1 X=0/20/16
CADD028I ACCESSED FILE=SDDINP SYS005=201 SYSWK1 X=0/3/1
CADD022I RELEASED 15 TRACKS FILE=SDDOUT VOL=SYSWK1
CADD003I AUTO-DELETE VOL=SYSWK1 FILE=SDDINP FILE-ID=DISK.FILE
// JOB OPTION CODE EXAMPLE 4
* TRUNCATE ISAM OPTION CODE
// DLBL ISMOUT,'ISAM.FILE (T,I)',12,ISC
// EXTENT SYS006,POOL01,4,1,1,3
// EXTENT SYS006,POOL01,2,2,1,4
// EXTENT SYS006,POOL01,1,3,1,38
// EXEC PROGRAM
CADD002I ALLOCATED FILE=ISMOUT SYS006=202 SYSWK2 X=1/1/3
CADD002I ALLOCATED FILE=ISMOUT SYS006=202 SYSWK2 X=2/164/4
CADD002I ALLOCATED FILE=ISMOUT SYS001=201 SYSWK1 X=3/38/38
CADD022I RELEASED 19 TRACKS FILE=ISMOUT VOL=SYSWK1
Controlling Generation Data Sets
By controlling generation data sets, CA Dynam/D lets you maintain multiple
versions of the same file. For example, you may wish to create a disk file
containing order data each day, and at the same time, process the order data
created the previous day. Under normal VSE operation, this would require
renaming or copying the previous day's file before the creation of the new file.
Another example would be to keep a disk file created the first business day of
each month or to keep a disk file created the first day of each fiscal quarter.
These types of multiple data set versions are called generation data sets.
Defining Generation Data Sets
With CA Dynam/D, you need only define the file in the CA Dynam/D Catalog as
a generation data set and specify the number of generations to be available.
When CA Dynam/D is called to open a generation-type data set as output, the
current generation number is incremented by 1, creating a new generation
number for that output. Keep in mind that this is the file's generation number.
4–20 User Guide