How long are statistics good for

From: Browett, Darren <dbrowett_at_city.coquitlam.bc.ca>
Date: Tue, 23 Oct 2001 10:13:55 -0700
Message-ID: <F001.003B24F4.20011023100024@fatcity.com>

We have a data-warehouse that is a combination of Snapshots and table-builds based on the snapshots.

The table builds run at 4:30 am, scripts are setup to start the snapshots at 7:00am and end
at 9:00pm. At 6:30 am a script performs an analyze on ALL (except sys and system) tables in
the database.

If the snapshots have been running all day, should I run an analyze before I do the table builds?
as opposed to after ?

At what point do the statistics on a table become no good ? when a new row is added ?

Thanks

Darren

Darren Browett P.Eng                                            This message
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Systems Analyst - Information Systems                           using 100%

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Author: Browett, Darren
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