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DATACLAS param in jcl

 
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sriramvempaty

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Joined: 02 Aug 2007
Posts: 18
Location: india

PostPosted: Wed May 28, 2008 12:49 pm    Post subject: DATACLAS param in jcl
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Hi,

Could anybody tell me significance of DATACLAS parameter in JCL.

Thanks,
Sriram.
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HappySrinu

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Joined: 22 Jan 2008
Posts: 195
Location: India

PostPosted: Wed May 28, 2008 12:56 pm    Post subject: Reply to: DATACLAS param in jcl
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If you got QW, I suggest you to try "QW DATACLAS".

If you don't have...this might help you..

DATACLAS can be omitted even if SMS is active if an Automatic Class
Selection (ACS) SMS exit is in use at your site.

DATACLAS can't be coded on the same DD statement as the DDNAME,
QNAME, DATA, *, DYNAM, or QNAME parameters.

A data class defines the following data set allocation attributes:

Data set organization
- Record organization (RECORG) or
- Record format (RECFM)
Record length (LRECL)
Key length (KEYLEN)
Key offset (KEYOFF)
Type, PDS or PDSE (DSNTYPE)
Space allocation (AVGREC and SPACE)
Retention period (RETPD) or expiration date (EXPDT)
Volume-count (VOLUME)
For VSAM data sets (IMBED or REPLICATE, CISIZE, FREESPACE,
SHAREOPTIONS)
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Anuj Dhawan

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Joined: 22 Apr 2006
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Location: Mumbai, India

PostPosted: Wed May 28, 2008 2:46 pm    Post subject:
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Hi,

The DATACLAS keyword specifies an SMS data class assigned to an SMS data set. The data class that you specify can be a maximum of eight characters in length. Wildcard characters are permitted.

Syntax
DATACLAS=dataclas

Please check below link for further details

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IEA2B650/12.15?DT=20040712170508
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expat

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Joined: 14 Mar 2007
Posts: 8593
Location: Back in jolly old England

PostPosted: Wed May 28, 2008 3:56 pm    Post subject:
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Questions about DATACLAS are site specific, you need to speak to your storage people.
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Przemyslaw Krekora

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Joined: 20 Feb 2008
Posts: 9
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PostPosted: Sat May 31, 2008 3:17 am    Post subject: dataclass contains
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Generally DATACLASS contains the physichal characteristic of data set.
Specify parameters like
Recorg,
Recfm,
Lrecl
Keylen,
keyoff
space allocation and go on.

What for ?
To reduce amount information written to DD statements in JCL file
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Sat May 31, 2008 4:08 am    Post subject:
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Hello,

Quote:
What for ?
To reduce amount information written to DD statements in JCL file
Yes, but i believe this is a secondary benefit and some of the parameters mentioned are not pre-set/dictated by dataclas. For example, datasets of many lrecls and recfms may be (and often are) allocacted using the same dataclas.

DATACLAS (imho) is used primarily by storage management to classify and manage the dasd resource of the organization. This includes allocating the appropriate dasd by data/business classification, defining the migration strategy for datasets by rule to ensure space availabbility, and is often an integral part of the overall backup strategy.
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Przemyslaw Krekora

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Joined: 20 Feb 2008
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PostPosted: Sat May 31, 2008 11:37 am    Post subject: Comments
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I totally agree icon_smile.gif
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