Re: Slow performance/response

Here is the plan:

SELECT STATEMENT Cost = 3414
SORT ORDER BY
SORT GROUP BY
VIEW
WINDOW BUFFER
SORT GROUP BY
FILTER
TABLE ACCESS BY INDEX ROWID STUDENT_ANALYTICAL_BASE NESTED LOOPS
VIEW
SORT GROUP BY
FILTER
TABLE ACCESS BY INDEX ROWID STUDENT_ANALYTICAL_BASE NESTED LOOPS
TABLE ACCESS BY INDEX ROWID STUDENT_ANALYTICAL_BASE INDEX RANGE SCAN PK_STUDENT_ANALYTICAL
INDEX RANGE SCAN PK_STUDENT_ANALYTICAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
FILTER
TABLE ACCESS FULL DUAL
INDEX RANGE SCAN PK_STUDENT_ANALYTICAL
FILTER
TABLE ACCESS FULL DUAL

Nelson, Allan wrote:

> Sounds like you should be able to read the whole table in the original
> 30 minutes. How about a query plan=3F
>
> Allan
>
> -----Original Message-----
> =46rom: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Leroy Kemnitz
> Sent: Tuesday, June 29, 2004 1:51 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=20
> 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.=20
> The tablespace is at 75% used, not seeing waits. There is alot of disk=20
> reads. No disk sorts. I am seeing a high 'Physical Blks per Read %'=20
> 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=20
> places to look. I will continue to search for ideas at metalink and in=20
> the books.
>
>
> Lee
>
>
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-- 
LeRoy Kemnitz
UW System Administration
Database Administrator
780 Regent Street, #246
Madison, WI 53714
Phone: (608) 265 -5775
Fax: (608) 265 - 2090

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