Re: Creating Histograms
- From: Niall Litchfield <niall.litchfield@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 22 Jul 2004 20:55:53 +0100
Comments as always
On Thu, 22 Jul 2004 10:37:21 -0400, Freeman, Donald
<dofreeman@xxxxxxxxxxx> wrote:
> OK, I understand your point about gathering on schedule. I'm moving into =
> taking over a turn-key contractor developed system. We are doing =
> stats/computed every day. We only add, at most, a few thousand records =
> a day. This is much, much less than 10%. We converted a few million =
> records, about five years worth of records, from four or five other =
> public health databases but our daily accrual is relatively small. I =
> probably wouldn't have to run stats once in a month.
take note of how many records you add to relatively *small* tables. 13
rows added to one of our tables caused hell until we gathered stats
again (and it took ages for anyone to admit that anything ahd
changed). That would be 13 rows in the sense of another financial year
to add to the 2 existing ones - so hardly significant at all :).
I guess I'm saying different objects might have different stats needs.
>We also don't =
> collect system stats. I'm hoping to get enough information here to 'have =
> a meeting' and get all of that changed, the method and rate of =
> collection.
Test system stats carefully (I'm probably too cautious on this), but
system stats are likely to make quite a noticeable difference to
execution times. It is, I'm increasingly convinced, the *right* thing
to do. It doesn't mean that you may not have adverse effects. Overall
system stats have been positive for our test financial environment-
enough so that they get introduced with the next software upgrade that
is running there - but there has been the odd hiccup.
--
Niall Litchfield
Oracle DBA
http://www.niall.litchfield.dial.pipex.com
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at //www.freelists.org/archives/oracle-l/
FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------
Other related posts:
