Farley, Peter x23353 wrote:
Lizette, the default DISP for existing datasets is OLD,KEEP, not OLD,DELETE.
Peter, if you do not specify any DISP, the default is NEW,DELETE,
_whether or not the data set already exists_. That's the way
allocation works: it does not check first to see if the dataset
exists (it would eventually find it, if it were cataloged and
there was an attempt to create a duplicate data set name, of
course, but that check comes later).
Kind regards,
-Steve Comstock
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 08, 2005 10:22 AM
To: IBM-MAIN@BAMA.UA.EDU
Subject: Re: 'ALLOCATE' a data set in my TSO/E session
Johnny,
When allocating any dataset under TSO or BATCH I always ensure the DISP
parameter is properly set.
If you just code a DD statement of
//DD1 DD DSN=datasetname
Then the default DISP is OLD,DELETE. That means at job termination the data
set will be deleted. I will let others on the list address how DFSMS might
change that statement.
So if you are using
ALLOOCATE DSN(CENTER.UADS) DD(SYSUADS)
During the time of your TSO session, the CENTER.UADS data set is allocated
with OLD which is an EXCLUSIVE enq and not SHARED.
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