RE: Gathering of Statistics
Date: Sun, 27 Jan 2008 00:46:20 -0000
Message-ID: <787DD2F284E39D4FA3C2ABD2DAF1AB2D014D6B@mail.vishalgupta.co.uk>
All stats gathered using following procedures are preserved for upto 30
days by Oracle automatically.
DBMS_STATS.GATHER_SCHEMA_STATS
DBMS_STATS.GATHER_DATABASE_STATS
You can restore stats using DBMS_STATS.RESTORE_XXX_STATS procedure.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/stats.htm #sthref1476
Regards,
Vishal Gupta
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Ronnie Doggart
Sent: 26 January 2008 07:42
To: andrew.kerber_at_gmail.com
Cc: jack_at_vanzanen.com; oracle-l_at_freelists.org
Subject: RE: Gathering of Statistics
Andrew,
Do you keep a copy of the stats before running the procedure to gather the new stats?. What would you do if the performance dropped after gathering the stats.
Ronnie
From: oracle-l-bounce_at_freelists.org [oracle-l-bounce_at_freelists.org] On Behalf Of Andrew Kerber [andrew.kerber_at_gmail.com] Sent: 25 January 2008 15:28
To: Ronnie Doggart
Cc: jack_at_vanzanen.com; oracle-l_at_freelists.org Subject: Re: Gathering of Statistics
I would seriously demand an explanation from the supplier. I received instructions to run an almost identical command daily from one of my suppliers, and it works perfectly. Keeps the performance right where it should be. ymmv.
On Jan 25, 2008 8:52 AM, Ronnie Doggart
<ronnie_doggart_at_lagan.com<mailto:ronnie_doggart_at_lagan.com>> wrote:
If the supplier gave the following statement:
Dbms_stats.gather_schema_stats(ownname=>user,cascade=>true,method_opt=>' FOR ALL INDEXED COLUMNS SIZE 254') And said to run it once a week, would you do it.
The reason I ask is the supplier did supply the statement to run and told us to run it once a week. But after running it a week ago the performance of the application dropped to become almost unusable. The drop in performance occurred after gathering the stats. When asked for assistance they told us to rerun the statement and it should fix the problem. But the statement is the problem.
Ronnie
From:
oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> [mailto:oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.o rg>] On Behalf Of Andrew Kerber
Sent: 25 January 2008 13:30
To: jack_at_vanzanen.com<mailto:jack_at_vanzanen.com> Cc: Ronnie Doggart;
oracle-l_at_freelists.org<mailto:oracle-l_at_freelists.org> Subject: Re: Gathering of Statistics
I agree. The vendor should be able to provide information about where and when, but you have to provide the script.
Siebel is notorious for needing special consideration when gathering
statistics.
On Jan 25, 2008 6:10 AM, Jack van Zanen
<jack_at_vanzanen.com<mailto:jack_at_vanzanen.com>> wrote:
I do not expect them to supply the scripts, however I do expect them to
be able to supply the information needed for proper statistics.
It often is a futile expectation though.
Jack
On 25/01/2008, Ronnie Doggart
<ronnie_doggart_at_lagan.com<mailto:ronnie_doggart_at_lagan.com>> wrote:
Hi All,
If you purchase an application from a supplier would you expect them to supply a script for gathering statistics on their schema and to make recommendations on how frequently the statistics should be gathered ?
Ronnie
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Andrew W. Kerber
'If at first you dont succeed, dont take up skydiving.'
The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it, is prohibited and may be unlawful. Please immediately contact the sender if you have received this message in error.
The views and opinions expressed in this email may not reflect the views and opinions of any member of Lagan Technologies Limited, or any of its subsidiaries.
Lagan Technologies Limited is a company registered in Northern Ireland with registration number NI 28773. The registered office of Lagan Technologies Limited is 209 Airport Road West, Belfast, Co. Antrim, BT3 9EZ.
--
Andrew W. Kerber
'If at first you dont succeed, dont take up skydiving.'
The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it, is prohibited and may be unlawful. Please immediately contact the sender if you have received this message in error.
The views and opinions expressed in this email may not reflect the views and opinions of any member of Lagan Technologies Limited, or any of its subsidiaries.
Lagan Technologies Limited is a company registered in Northern Ireland with registration number NI 28773. The registered office of Lagan Technologies Limited is 209 Airport Road West, Belfast, Co. Antrim, BT3 9EZ.
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Received on Sat Jan 26 2008 - 18:46:20 CST