Oracle-L: RE: WAITS

From: MacGregor, Ian A. <ian_at_SLAC.Stanford.EDU>
Date: Thu, 09 May 2002 15:23:24 -0800
Message-ID: <F001.0045DD00.20020509152324@fatcity.com>

In general There are two problems in using the "top five waits" out of statspack: it reports idle waits; no matter how well-tuned your database there will always be a top five. The numbers presented show total time-waited in csecs for the time period. As Jared said we don't know the time period. We don't know the average wait time.

I have learned some rudimentary gnuplot skills. Each morning I produce graphs of what went on the in the databases the previous day on and hour by hour basis. If something is really askew I break the hour down into ten minute blocks. This helps me to better recognize patterns of database usage.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu

-----Original Message-----

Sent: Thursday, May 09, 2002 11:49 AM
To: Multiple recipients of list ORACLE-L

There is a vital piece of information missing, namely how long was the accumulated wait time for each wait, and over what period of time?

Jared

"Seema Singh" <oracledbam_at_hotmail.com>
Sent by: root_at_fatcity.com
05/09/2002 11:18 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        WAITS

Hi
I checked wait in my database and found the following are top 5 waits.

Event                                               Waits
single-task message                             1,411,047
log file sync                                     326,222
SQL*Net more data to client                     7,363,877
control file parallel write                        27,674
latch free                                        107,486

Any suggestions from group.what to do?
Thx
-Seema

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Author: Seema Singh
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Author: MacGregor, Ian A.
INET: ian_at_SLAC.Stanford.EDU

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