RE: Gathering of Statistics
- From: Ronnie Doggart <ronnie_doggart@xxxxxxxxx>
- To: "andrew.kerber@xxxxxxxxx" <andrew.kerber@xxxxxxxxx>
- Date: Sat, 26 Jan 2008 07:41:44 +0000
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@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] On Behalf
Of Andrew Kerber [andrew.kerber@xxxxxxxxx]
Sent: 25 January 2008 15:28
To: Ronnie Doggart
Cc: jack@xxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxx<mailto:ronnie_doggart@xxxxxxxxx>> 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@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>
[mailto:oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>] On
Behalf Of Andrew Kerber
Sent: 25 January 2008 13:30
To: jack@xxxxxxxxxxxx<mailto:jack@xxxxxxxxxxxx>
Cc: Ronnie Doggart; oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>
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@xxxxxxxxxxxx<mailto:jack@xxxxxxxxxxxx>> 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@xxxxxxxxx<mailto:ronnie_doggart@xxxxxxxxx>> 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
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Andrew W. Kerber
'If at first you dont succeed, dont take up skydiving.'
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Limited is 209 Airport Road West, Belfast, Co. Antrim, BT3 9EZ.
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