defining a dataset

rashmi.ranjan75 · New User Joined: 20 Feb 2006 Posts: 34

Hello,

How can i perform following step in a jcl for sequential dataset

Overwrite if exist and else create

Please suggest

regards
rashmi

Lkmi · New User Joined: 04 Mar 2005 Posts: 53 Location: Newyork

include thE STEP 1 in your jcl before the step to delete the dataset(if it already exists)

//step1 EXEC UNCAT
//U.SYSIN DD *
DELETE DSN=dataset name
/*

this creates the dataset...Change values for parameters as required.
//step2 EXEC PGM= IEFBR14
//data1 DD DSN=datasetname
// DISP=(NEW,CATLG,DELETE,UNIT=SYSDA,
// RECFM=FB,LRECL=64,MGMTCLAS=MCEXP3MO,
// SPACE=(64,(1,1),RLSE)

Lkmi · New User Joined: 04 Mar 2005 Posts: 53 Location: Newyork

BY THE WAY THE SOLUTION I GAVE WUD CREATE IF IT ALREADY EXISTS.
iam not sure if it can be overwritten

rajakumar10 · New User Joined: 03 Aug 2005 Posts: 12

use IDCAMS with the control card "LISTCAT ENT(datasetname)". This will lead to a RC of 4 if the dataset does not exist, and to a RC of 0 if it does exist.

If RC eq 0
overwrite
if RC eq 4
create

Hope this helps.

Rupesh.Kothari · Member of the Month Joined: 27 Apr 2005 Posts: 463

Hi,

Adding to LKMI's solution just add following line after step1

If MAXCC=8 maxcc=0
If file does not exist it will create file in step2.

Regards
Rupesh