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What exactly is a hyperdescriptor?

 
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purushottam

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Joined: 26 Feb 2007
Posts: 37
Location: pune

PostPosted: Fri Mar 13, 2009 6:59 pm    Post subject: What exactly is a hyperdescriptor?
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I know I am asking the obvious, but can anyone tell me what exactly is a hyper descriptor. Like...

1. Whether it will be defined in FDT (Field definition table) ?
2. Is it a similar concept like descriptor or super descriptor or something else ?
3. How and under which condition we need to use this? If you can explain with example.

I did try to find it in manual but did not got answer for above questions.

Thanks,
Puru
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ofer71

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Joined: 27 Dec 2005
Posts: 2360
Location: Israel

PostPosted: Fri Mar 13, 2009 8:49 pm    Post subject:
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Hyperdescriptors documentation can be found within ADABAS documentation, ADABAS Design book --> Record and Field Definitions --> Special Fields and Descriptor Fields.

Hyperdescriptors are keys that their value is calculated based on a user program. Such programs are called user-exits, and must be supplied to the ADARUN statement with the convention of HEXnn=.

Example for hyperdescriptor usage might be an implementation of Soundex algorithm, to find similar names. I've seen that implemented when searching Arabic & German names, which may be stored in more then one way.

Another implementations might be Fuzzy logic, Derived keys, Hash tables and even fingerprint matching.

And yes, Hyperdescriptors are defined in SDT as any other descriptor field, with the keyword HYPER.

O.
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