Oracle-L: RE: analyze table takes forever

From: <Govind.Arumugam_at_alltel.com>
Date: Tue, 29 Oct 2002 10:59:40 -0800
Message-ID: <F001.004F6ACB.20021029105940@fatcity.com>

You mentioned that count(*) took 10 minutes but did not say how many rows are present in that partition; if number of rows is less than 1 million, I would do the following.

alter table <owner>.<table_name> move partition <partition_name> tablespace <tablespace_name> nologging;

and then re-analyze the table partition.

We have seen a significant improvement in runtimes when we set the sort_area_size to 50Mb while doing these kinds of operations.

Also, I read in metalink sometime back that there is a known bug if you estimate less than 20%.

Hope this helps.

Govind

-----Original Message-----
Sent: Tuesday, October 29, 2002 1:25 PM
To: Multiple recipients of list ORACLE-L

what's the structure of the table?

And try taking an export of this partition and import it into it's own table in a development box... see if you can analyze it there.

Nick

-----Original Message-----
Sent: Tuesday, October 29, 2002 7:49 AM To: Multiple recipients of list ORACLE-L

Dear gurus !

We are trying to analyze a table partition (estimate 2 %) and it takes forever.
analyze table ... partition (P20021022) estimate statistics sample 2 percent;
For instance, select count(*) from the same partition takes 10 minutes , but
the analyze takes literally infinite amount of time , once i left it to run
for half a day and killed it since it did not finish. Even when i do analyze ... estimate statistics sample 100 rows; , it takes
almost 2 minutes to ananlyze 100 rows.
Any ideas ?
It's Oracle 8.1.6 on an expensive 6 CPUs HP machine with EMC storage. Thanks a lot in advance.

DBAndrey

03-9254520
058-548133
mailto:andreyb_at_elrontelesoft.com

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Author: Andrey Bronfin
INET: andreyb_at_elrontelesoft.com

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INET: Govind.Arumugam_at_alltel.com

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