Get the response time more with First_Rows Hint.

Hello
I use 10.2.0.1.0 oracle version. I have a sql query that gives performance with cutting-edge FIRST_ROWS problem.     I expect the best response time with suspicion of "FIRST_ROWS (5)", but his is the worst, with use of a different set of the index, which is local to the partition. Please, help me to understand, the reason behind this change in negative execution path?
     First query gives all the ~3488 rows within ~1 minutes but the query with HINT is taking ~15 minutes for providing initial few rows itself. 
For second one i am not able to get the exact and estimated cardinality stats , as it was taking lot of time for completion, so providing Autotrace plan only.
     
Main Query:
Published by: 930254 on October 15, 2012 04:55

930254 wrote:
Yes, Jonathan, in fact in the first case, i 'I' table is being analyzed using an overall index, but suspicion FIRST_ROW sound using the index that is local to the partition. resulting in the digitization of all partitions of 448. I think it's causing bottleneck. Is there something like: FIRST_ROW suspicion that affect this type of systematic index scan?

In the first case the optimizer has unnested subquery of REACTION and used to bring to the table, I, and that's what dictated the choice of index.

In the case of first_rows (5) decided that the range index scan will take adequate data if some time he chose a different index - running subqueries in the REACTION as a subquery for filter on each line. But it is the estimate of how long it will find adequate data (and how much time he will have to run the subquery to eliminate unnecessary data) does not.

Concerning
Jonathan Lewis

Tags: Database

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