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Thomas Gabert
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Joined: 07 Dec 2005
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 Posted: Wed Dec 07, 2005 8:20 am Post subject: DFSORT and compressed datasets |
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Hello everybody,
does DFSORT have any highlights in determining the space attributes for the sortwork datasets if the sortin dataset is a compressed dataset?
Regards,
Thomas |
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Frank Yaeger
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| Posted: Wed Dec 07, 2005 11:11 am Post subject: |
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What do you mean by "highlights"?
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Frank Yaeger - DFSORT Development Team (IBM)
Specialties: JOINKEYS, FINDREP, WHEN=GROUP, ICETOOL, Symbols, Migration
DFSORT is on the Web at:
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Thomas Gabert
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| Posted: Wed Dec 07, 2005 11:23 am Post subject: |
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| Are there any specialties in determining the space attributes in this area? |
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Frank Yaeger
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| Posted: Wed Dec 07, 2005 12:58 pm Post subject: |
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I'm still not sure what you're asking. DFSORT can determine what it needs to determine for the work data sets when SORTIN is compressed.
_________________
Frank Yaeger - DFSORT Development Team (IBM)
Specialties: JOINKEYS, FINDREP, WHEN=GROUP, ICETOOL, Symbols, Migration
DFSORT is on the Web at:
www.ibm.com/storage/dfsort |
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Thomas Gabert
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| Posted: Thu Dec 08, 2005 6:27 am Post subject: |
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Sorry for the confusion I caused. I just mean the following: If a compressed sortin dataset has e.g. 200 cyls allocated. Uncompressed it has e.g. 500 cyls. Which value is the base for the sortwork datasets? The 200 or the 500 cyls? Hope this is a bit clearer. Thanks.
Regards,
Thomas |
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Thomas Gabert
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| Posted: Thu Dec 08, 2005 8:42 am Post subject: |
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Does DFSORT read at first the entire sortin datasets to determine how many records will be sorted?
Regards,
Thomas |
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Frank Yaeger
Sort Forum Moderator
Joined: 02 Dec 2002
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Location: San Jose
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| Posted: Thu Dec 08, 2005 11:21 am Post subject: |
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| Quote: | | Does this mean DFSORT reads at first the entire sortin datasets to determine how many records will be sorted? |
No.
DFSORT does NOT read the records in order to determine how much work space is needed. DFSORT determines the filesize and allocates the work space before it reads any records. The methods by which DFSORT does that are proprietary. DFSORT can determine the real filesize of a compressed data set and use that to determine the work space needed.
_________________
Frank Yaeger - DFSORT Development Team (IBM)
Specialties: JOINKEYS, FINDREP, WHEN=GROUP, ICETOOL, Symbols, Migration
DFSORT is on the Web at:
www.ibm.com/storage/dfsort |
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