Re: Slow performance/response

From: Juan Carlos Reyes Pacheco <jreyes_at_dazasoftware.com>
Date: Tue, 29 Jun 2004 14:57:32 -0400
Message-Id: <40E1BB9C.000003.01184@CACHITOSS>

Very few informatoin but, my suggestions are

- Try again in a few hours, maybe other things is happening
- try increasing OPTIMIZER_MAX_PERMUTATIONS  to 80000 and see
- In test database (not production), recalculate statistics and try again

If it uses hints (like ordered, etc.) maybe now that hints are not the best, because load could had change.

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

From: oracle-l_at_freelists.org
Date: 06/29/04 14:49:51
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 - 13:58:21 CDT