Re: Why wait?

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Wed, 24 Apr 2002 05:33:25 -0800
Message-ID: <F001.0044DA04.20020424053325@fatcity.com>

Thats fine for expensive sql...but waits can be a whole lot more than that...

(Trivial example)

session 1: delete from blah where x = 1;
session 2: delete from blah where x = 1;
session 3: delete from blah where x = 1;

etc

The wait stats will quickly show up the problem here...

hth
connor

• Greg Moore <sqlgreg_at_pacbell.net> wrote: > There's something I don't understand. Why use the
  > wait interface to investigate "db file scattered
  > read" or "db file sequential read"?
  >
  > The end result is finding an SQL statement that does
  > a lot of reads. There's no guarantee it's a poorly
  > tuned SQL statement, just that it does a lot of
  > reads.
  >
  > If that's what you want, why not just query v$sql
  > and order by physical reads? Doing this is a whole
  > lot easier. Also, unlike the hit and miss results
  > from v$session_wait, v$sql provides a comprehensive
  > picture.
  >
  > Thanks for your input. Cheers!
  >
  >
  

  ---

Connor McDonald
http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk)

"Some days you're the pigeon, some days you're the statue"

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Received on Wed Apr 24 2002 - 08:33:25 CDT