RE: Slow performance/response

From: Powell, Mark D <mark.powell_at_eds.com>
Date: Tue, 29 Jun 2004 15:03:43 -0400
Message-ID: <564DE4477544D411AD2C00508BDF0B6A1CE0ABBC@usahm018.exmi01.exch.eds.com>

Lee, without the SQL and explain plan output to look at there isn't that much anyone can do to help you.

Did the performance of this query change all of a sudden, or did the current performance just get brought to your attention? If the performance slowly degraded over time then the results you are seeing could just be a function of the amount of data that has to be processed.

When were the statistics for this table last updated? And how?

HTH -- Mark D Powell --

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

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Leroy Kemnitz Sent: Tuesday, June 29, 2004 2:51 PM
To: oracle-l_at_freelists.org
Subject: Slow performance/response

All -

I have not done tuning a great deal so bear with me. I currently have a table that consists of 10 million rows - warehouse. The largest table I have. A few months ago a query took around 30 minutes to run against this table. This was acceptable. Now the query takes almost 5 hours!!!

The db is 9.2.0.4 running on aix 5.2. I have stats that I ran on the db during the query run and it shows the db working but not maxed out. The tablespace is at 75% used, not seeing waits. There is alot of disk reads. No disk sorts. I am seeing a high 'Physical Blks per Read %' but I am attrbiuting that to the datafiles being on one disk. I do plan on rearranging them after the query finishes and hope this helps.

I am looking for other ideas of what could be wrong with the table or places to look. I will continue to search for ideas at metalink and in the books.

Lee

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Received on Tue Jun 29 2004 - 14:00:53 CDT