Re: Performance problem .... HELP :-(

[Edward Shevtsov]

Title: Performance problem .... HELP :-(

Hi Ian,   take a careful look at fragmentation of their indexes and possible chained rows in the tables. Probably RATE_SCHEDULE_LINK_PK is a good start point Also the cardinality (estimated numbers of output rows for each step) may confuse you if their statistics is lost or obsolete for some objects   Regards, Ed ----- Original Message ----- From: Biddell, Ian To: Multiple recipients of list ORACLE-L Sent: Wednesday, December 19, 2001 1:50 PM Subject: Performance problem .... HELP :-( Hi all, Hoping someone can shed some light on a problem I have. We a particular cursor in a batch program running in production at a client site which has suddenly decided to work really badly. The program hasn't been changed but I think the customer has done some sort of reorg on the database. I traced the program on their server and also on a copy of the database on our server (our copy taken before the reorg) As can be seen from the tkprof output from a trace on the program for about an hour theirs does a lot of buffer IO for few rows returned compared to ours. The execution path in the explain is the same but the row counts down the side are different. Does anyone have any idea why this would be happening or what further investigation I can do.  All access is via PK so it should be flying like the second example.