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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Slow performance/response
Lee,
It may be that a few months ago your table *wasn't* 10 million rows, that for a reason or another the plan hasn't changed (or it has). The most serious thing which can go wrong with a table is chaining, but this is more the scourge of OLTP than DSS, and anyway your stats (they are up-to-date, of course) will tell you that. That said, I have more often seen things wrong with queries than with tables.
HTH SF
Leroy Kemnitz wrote:
>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
>
>
>
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Tue Jun 29 2004 - 14:03:44 CDT
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