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Message Posted: Wed, 16 Nov 2011 @ 09:26:50 GMT


     
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Subj:   Re: FastExport Sessions vs performance
 
From:   Dave Wellman

Hi,

The 'sessions' specified in FX are only used to transfer the result set back to the client.

Essentially what happens is:

- the select gets run on a single session (just as if you ran it using SQLA or BTEQ) and the answer set is built in a spool file

- the spool file is then split into data blocks

- the data blocks are transferred to the client using multiple sessions


It is this data transfer portion where FX gets it's speed compared to BTEQ (and most other export utilities).


Cheers,

Dave

Ward Analytics Ltd - Information in motion (www.ward-analytics.com)



     
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