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khanirfan
New User
Joined: 02 Jul 2022
Posts: 1
Location: india
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Hi! I'm new to Mainframes. Please escuse me if any mistakes.
I got asked in a interview that what should we code a file parameters(space) if we don't know the number of records that will be written to it? |
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Willy Jensen
Active Member
Joined: 01 Sep 2015
Posts: 678
Location: Denmark
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one suggestion: small primary, large secondary and release:
i.e. SPACE=(CYL,(1,50),RLSE) |
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Rohit Umarjikar
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Joined: 21 Sep 2010
Posts: 3013
Location: NYC,USA
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| RLSE is key to note here when you answer. |
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Joerg.Findeisen
Senior Member
Joined: 15 Aug 2015
Posts: 1134
Location: Bamberg, Germany
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It depends also on availability of DFSMS and assignment of a MCLS with immediate release. JCL RLSE parm looks nice, but doesn't have to be coded for all use cases.
For unknown sizes, allocation should be kept dynamically. Best way is to assign a DCLS that allows multivolume (either static or dynamic). Quite a few options to chose from. |
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Willy Jensen
Active Member
Joined: 01 Sep 2015
Posts: 678
Location: Denmark
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Also cylinder allocation is a perhaps bit of overkill, so
SPACE=(TRK,(15,750),RLSE)
will provide the same space as above, but will free on track level.
And all the caveats pointed out above still apply. |
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