From AnandPrakash@firsthealth.com Tue, 23 Oct 2001 14:57:54 -0700 From: "Anand Prakash" Date: Tue, 23 Oct 2001 14:57:54 -0700 Subject: Re: How long are statistics good for Message-ID: MIME-Version: 1.0 Content-Type: text/plain Which version of Oracle are you using. In 8i you can set 'monitoring on' for the tables and use dbms_stats to analyze stale. (Though, I am getting error while using dbms_stats for the partitioned tables. So I have made a home made version to analyze stale). As per my calculations, package dbms_stats considers statistics stale if all DMLs affect more than 10% of number of rows.   Anand Prakash >>> dbrowett@city.coquitlam.bc.ca 10/23/01 11:00AM >>>We have a data-warehouse that is a combination of Snapshots and table-buildsbased on the snapshots.The table builds run at 4:30 am, scripts are setup to start the snapshots at7:00am and end at 9:00pm.  At 6:30 am a script performs an analyze on ALL (except sys andsystem) tables inthe database.If the snapshots have been running all day, should I run an analyze before Ido the table builds?as opposed to after ?At what point do the statistics on a table become no good ? when a new rowis added ?ThanksDarren--------------------------------------------------------------------------------------------------------------------------Darren Browett P.Eng                         This messagewas transmittedSystems Analyst - Information Systems                 using 100%recycled electrons City of Coquitlam P:(604)927 - 3614 E:dbrowett@city.coquitlam.bc.ca --------------------------------------------------------------------------------------------------------------------------- -- Please see the official ORACLE-L FAQ: http://www.orafaq.com-- Author: Browett, Darren  INET: dbrowett@city.coquitlam.bc.caFat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051San Diego, California        -- Public Internet access / Mailing Lists--------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail messageto: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and inthe message BODY, include a line containing: UNSUB ORACLE-L(or the name of mailing list you want to be removed from).  You mayalso send the HELP command for other information (like subscribing).