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Primary and Secondary Space allocation for a flat SYSDA file

 
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Soumya Roy

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Joined: 19 Feb 2009
Posts: 10
Location: Bangalore

PostPosted: Thu Jun 18, 2009 12:57 pm    Post subject: Primary and Secondary Space allocation for a flat SYSDA file
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Hi all,

Can anyone suggest what is the exact calculation behind the primary and secondary allocation for a flat disk file.
Suppose we decalre a space parameter like :
SPACE=(CYL,(250,99),RLSE)
How the allocation will happen in this case both for Primary and secondary.

And how the RLSE work... I mean will it release only the unused primary cyllinders or the unused secondary cyllinders or both.

Thanks.
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expat

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Joined: 14 Mar 2007
Posts: 8630
Location: Back in jolly old England

PostPosted: Thu Jun 18, 2009 1:12 pm    Post subject:
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1) Have you read the JCL Reference manual - easily reached by using the "IBM Manuals" button at the top of each page.

2) Have you searched the forum for similar topics.
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8212
Location: Dubuque, Iowa, USA

PostPosted: Thu Jun 18, 2009 5:04 pm    Post subject:
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Primary: figure out how much space you need to hold the records that are going to be put into the file. That is a good minimum primary value.

Secondary: Figure out how much growth in the record count over time there will be, or what the peak processing requires, or find some other measure to determine how much additional space is needed. Use that for the secondary.
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