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Reading KSDS with Date field as one of the Key field

 
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rajithmuthan

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Joined: 04 Jun 2007
Posts: 2
Location: USA

PostPosted: Tue Jul 28, 2009 2:20 am    Post subject: Reading KSDS with Date field as one of the Key field
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Hi,
I have a KSDS key as below
Branch
Dealer
effective date

The records in the VSAM file can have effective date as future date. On that date I need to read the record with the new effective date and all other previous dates I need to read the old record. I know I can do it thru Generic and read next. But is there any other efficient way of doing it?


Rajith Bellimuthan
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8056
Location: East Dubuque, Illinois, USA

PostPosted: Tue Jul 28, 2009 3:15 am    Post subject:
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Build an alternate index on effective date.

Reading the key generic means, by the way, that you have to specify at least part of the branch to do the read -- generic key reads go from left to right. If your key is branch, dealer, effective date then you cannot read all keys that have a given effective date with a generic read.
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