Performance issue , OCI related ? - urgent , please

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

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Author: Andrey Bronfin
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