Re: Slow performance/response
- From: Stephane Faroult <sfaroult@xxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 29 Jun 2004 21:05:49 +0200
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
>
>
>
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