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sriramvempaty
New User
Joined: 02 Aug 2007
Posts: 17
Location: india
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Hi,
Could anybody tell me significance of DATACLAS parameter in JCL.
Thanks,
Sriram. |
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References
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HappySrinu
Active User
Joined: 22 Jan 2008
Posts: 191
Location: India
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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 D.
Global Moderator
Joined: 22 Apr 2006
Posts: 2156
Location: Phoenix, AZ
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expat
Global Moderator
Joined: 14 Mar 2007
Posts: 3505
Location: Brussels once more ...
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| Questions about DATACLAS are site specific, you need to speak to your storage people. |
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Przemyslaw Krekora
New User
Joined: 20 Feb 2008
Posts: 9
Location: Poland
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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
Global Moderator
Joined: 23 Nov 2006
Posts: 8633
Location: 221 B Baker St
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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
New User
Joined: 20 Feb 2008
Posts: 9
Location: Poland
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I totally agree  |
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