List -
I am having a discussion on how a GDG is handled based on the DISP. I was
always working from the position that the use of MOD changes JCL behavior
slightly with a dataset. My understanding is: If using MOD then if the dataset
does not exist, it is treated as NEW and if it exists then treated as OLD. That
seems reasonable, however, I have some users coding this for GDGs and I am not
sure why they should work.
Now the following are samples and I am sure there are other coding that I have
not included.
So based on the following, which should be considered incorrect coding
1) First time creating the new Daily dataset. There is also a concern on the
second coding
//SMFOUT DD DSN=SMFHLQ.DAILY.SMFDSN(+1),
// DISP=(MOD,CATLG,DELETE),
// STORCLAS=NONSMS,EXPDT=99000,
// RECFM=VBS,BLKSIZE=32000,LRECL=32760,BUFNO=10,
// UNIT=TAPE
*** WARN 04: DISP FOR NEW GDG DATASET IS NOT (NEW,CATLG)
Appending SMF data daily dataset
//SMFOUT DD DSN=SMFHLQ.DAILY.SMFDSN(0),
// DISP=(MOD,CATLG,DELETE
*** WARN 04: DISP FOR NEW GDG DATASET IS NOT (NEW,CATLG)
2) Using BR14 with MOD DELETE for a GEN that has NOT been created
//S1 EXEC PGM=IEFBR14
//GDGBASE DD
DISP=(MOD,DELETE,DELETE),DSN=TSOHLQ.GDGTEST(0),SPACE=(TRK,(1,1)),UNIT=SYSDA
!!!ERROR 04: GDG(0) NOT PERMITTED WITH DISP=NEW
GDG does not have any GENs yet. So get the following
//COPYIT1 EXEC PGM=IEBGENER
//SYSPRINT DD SYSOUT=*
//*
//*
//SYSIN DD DUMMY
//SYSUT2 DD DISP=(MOD,CATLG,DELETE),UNIT=SYSDA,
// SPACE=(CYL,(1,1),RLSE),
// DSN=TSOHLQ.GDGTEST(+1)
*** WARN 04: DISP FOR NEW GDG DATASET IS NOT (NEW,CATLG)
//SYSUT1 DD *
TEST RECORD
The GDG has one generation in the base I am able to see this should work
//****************************************************************
//*
//****************************************************************
//S1 EXEC PGM=IEFBR14
//GDGBASE DD DISP=(MOD,DELETE,DELETE),DSN=TSOHLQ.GDGTEST(0)
I am not saying these are great ways to code DISP=MOD, just that I have seen
this coding work but have been told that they should not work or they would
cause weird/crazy results
Any and all opinions welcome.
Thanks
Lizette Koehler
statistics: A precise and logical method for stating a half-truth inaccurately
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