Re: Performance issue , OCI related ? - urgent , please

Do you keep the each batch of 5000 rows ? If yes, are you running out of memory ?

Anjo.

Andrey Bronfin wrote:

> Dear gurus !
> We are facing a severe performance problems here that i have no idea of how
> to address.
> There is a C++ program , which uses OCI , that does the following.
> It initiates a long running SQL select statement, and then fetches the
> result set from the DB in buffers of 5000 records.
> Now , the problem is that it takes significantly (exponentially) more time
> to fetch each subsequent result set.
> I.e. , it takes a second to bring the first 5000 records, it takes 2
> seconds to bring the next 5000 rows , it takes 3 seconds to bring the third
> set of 5000 rows and ....it takes a hour to bring the 100th set of 5000
> rows.
> My main question is : what actually happens within the DB engine when you
> execute a huge select and then fetch the results buffer-by-buffer ?
>
> Thanks a lot !!!
>
> DBAndrey
>
> * 03-9254520
> * 058-548133
> * mailto:andreyb_at_elrontelesoft.com
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Andrey Bronfin
> INET: andreyb_at_elrontelesoft.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Anjo Kolk
  INET: anjo_at_oraperf.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).