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vch
New User
Joined: 01 Feb 2008
Posts: 22
Location: chennai
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Hi,
Can anyone tell me what is the difference between KEEP and UNCATLG in DISP keyword in JCL |
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Anuj Dhawan
Superior Member
Joined: 22 Apr 2006
Posts: 6250
Location: Mumbai, India
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Hi,
Well, two consideration are there, whether steps executes sucessfully or not..
1.Normal Termination Disposition Subparameter:
KEEP:
The data set will be kept on the volume when the step ends normally. KEEP is the only valid termination disposition for a VSAM data set. VSAM files shouldn't be cataloged, uncataloged, passed, or deleted.
UNCATLG:
If the step ends normally, MVS will delete the catalog entry for the data set but will not delete the data set itself.
2. Abend (Conditional) Disposition Subparameter:
KEEP:
The data set will be kept on the volume if the step abends. KEEP is the only valid termination disposition for a VSAM data set. VSAM files shouldn't be cataloged, uncataloged, passed, or deleted.
UNCATLG:
If the step abends, MVS will delete the catalog entry for the data set but will not delete the data set itself. |
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the_gautam
Active User
Joined: 05 Jun 2005
Posts: 165
Location: Bangalore
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KEEP : the dataset will be kept on the volume for the future use but the calatog entry will not be made.
UNCATLG : the dataset will be uncataloged after the termination of the JOB. |
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vch
New User
Joined: 01 Feb 2008
Posts: 22
Location: chennai
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| how will you access UNCATLG data set? |
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Gnanas N
Active Member
Joined: 06 Sep 2007
Posts: 792
Location: Chennai, India
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| Use VOLSER while referring the dataset. |
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Gnanas N
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Joined: 06 Sep 2007
Posts: 792
Location: Chennai, India
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| and Unit Type on which the dataset resides... |
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vch
New User
Joined: 01 Feb 2008
Posts: 22
Location: chennai
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| for KEEP also we are doing like that only, No catalog entry then what is the difference between KEEP and UNCATLG |
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mmwife
Super Moderator
Joined: 30 May 2003
Posts: 1592
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Hi VCH,
I think you misunderstood. KEEP does nothing to change the status of the file; uncat deletes the catalog entry and you must thereafter reference it using the volser and unit. |
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star_dhruv2000
New User
Joined: 03 Nov 2006
Posts: 87
Location: Plymouth, MN USA
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Hi all,
Following is my understanding of this issue:
UNCATLG: No entry is made in user catalog but an entry is made in system catalog and DS kept on mentioned VOLSER.
KEEP: No entry is made in either of catalog.
Please correct me.
Cheers! 
Thank you. |
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enrico-sorichetti
Superior Member
Joined: 14 Mar 2007
Posts: 10873
Location: italy
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| Quote: |
| UNCATLG: No entry is made in user catalog but an entry is made in system catalog and DS kept on mentioned VOLSER. |
wromg 
a little bit of testing never hurt anyone ...
if a dataset is SMS manage must be cataloged, You will get all sort of nasty message otherwise
disp = (NEW.KEEP) if not SMS managed will allocate and later on the dataset must ve accessed using the vol=ser parameter...
disp=(NEW,CATLG) dataset will be allocated and cataloged wherever the catalogl alias structure will dictate
disp=(NEW,UNCATLG), useless/confusing specification, if not SMS managed will allocate and later on the dataset must be accessed using the vol=ser parameter...
but in the job log You will get a ...
IEF287I ENRICO.MF.NEW NOT UNCTLGD 2
disp=(OLD,CATLG) will catalog ( if not cataloged before ) a dataset accessed using the vol=ser
disp=(OLD,KEEP) leaves things as before
disp=(OLD,UNCATLG) will uncatalog the dataset, later on the dataset must be accessed using the vol=ser parameter...
disp=(OLD,DELETE) will delete the dataset and, things become triky now
... if the dataset was cataloged and accessed thru the catalog ( no vol=ser )
the dataset will be uncataloged
... if the dataset was accessed thru the vol=ser specification, no catalog search is involved
and no catalog action will be taken
if the dataset was cataloged it will be left there with a dangling catalog entry
clear enough |
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vch
New User
Joined: 01 Feb 2008
Posts: 22
Location: chennai
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| Thank you enrico |
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