v$tempstat question

From: Ed Bittel <bitlist_at_yahoo.com>
Date: Wed, 24 Oct 2001 10:25:41 -0700
Message-ID: <F001.003B36CC.20011024104029@fatcity.com>

I've been trying to track down the source of high 'direct path read' and 'direct path write' waits. It appears the waits are related to locally managed temporary tablespaces. However, I'm puzzled by what is reported in v$tempstat.

SQL> select FILE#, READTIM, WRITETIM, AVGIOTIM,

             LSTIOTIM, MINIOTIM, MAXIORTM, MAXIOWTM 
     from v$tempstat;

FILE# READTIM WRITETIM AVGIOTIM LSTIOTIM MINIOTIM MAXIORTM MAXIOWTM
----- ------- -------- -------- -------- ----------

---------- 1 3 0 0 1 0 6393 78 2 2 252 443 636 0 1387 188

How could the values for MAXIORTM (maximum time spent doing a single read) be substatially greater than those reported for READTIM (time spent doing all reads)?

This situtation persists even after all of the users have logged out of the database, so it doesn't appear to be a case of the read having not yet completed.

FYI: We're running Oracle 8.1.6.3 on Sun Solaris.

-Ed

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Author: Ed Bittel
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