direct path read waits

From: <babu.nagarajan_at_Cummins.com>
Date: Thu, 20 Feb 2003 11:41:09 -0800
Message-ID: <F001.0055353D.20030220114109@fatcity.com>

All

We are doing some performance testing while moving from one server to another. I was trying to time some index rebuilds and noticed something that I cant explain.

I am rebuilding an index on a 1 million row table. Lets say its on tablespace A and when I rebuild it to tablespace B it does in 33 seconds. I put it back on A and then rebuild it on tablespace C it takes 1 min 40 seconds. The only change here is the target tablespace.

When I set 10046 level 12 and counted time waited (ela column)

>From A - B (33 seconds)

     sum of elapsed in "DIRECT PATH READ" = 394 ( i think this is cs)

>From A - C (1 min 40 sec)

     sum of elapsed in "DIRECT PATH READ" = 6251

The P1 of all of these waits point to the same file (#4 part of TEMP tablespace)

Why should the change in the target tablespace affect the time taken to read from the TEMP tablespace?

TIA Babu

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Received on Thu Feb 20 2003 - 13:41:09 CST