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help on ''AMP=('AMORG','BUFND=8','BUFNI=4'),''.

 
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srebba
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Joined: 26 Apr 2007
Posts: 37
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PostPosted: Fri Jun 01, 2007 11:14 pm    Post subject: Re: How to identify wether the dataset is a PS or VSAM in RU
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For VSAM files we can specify like the below for input file.
//SORTIN DD DSN=VSAM.VC,
// AMP=('AMORG','BUFND=8','BUFNI=4'),DISP=SHR
Without ''AMP=('AMORG','BUFND=8','BUFNI=4'),'' also we can code for VSAM file .
So for Non VSAM file we will not have like above
Please dont ask me what are ''AMP=('AMORG','BUFND=8','BUFNI=4'),''

can Any body can help on ''AMP=('AMORG','BUFND=8','BUFNI=4'),''.

Thank you,
Sree
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expat

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PostPosted: Sat Jun 02, 2007 1:34 am    Post subject:
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Quote:
can Any body can help on ''AMP=('AMORG','BUFND=8','BUFNI=4'),''.

Yes, you are allocating buffers to the file, but I am amused/bemused by the combination.

If the file is Random access then I would allcoate more index buffers (BUFNI)

and if the access is sequential, then more data buffers for read ahead capability.

The 8:4 ratio is just an extrapolation of the standard 2:1 allocation which is the default.

Also remember that if the access is skip-sequential NEVER EVER allocate a large number of buffers.
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