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:[EMAIL PROTECTED] > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > -- > Author: Andrey Bronfin > INET: [EMAIL PROTECTED] > > 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: [EMAIL PROTECTED] (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: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
