RE: How long are statistics good for

[Anand Prakash]

John   My initial tests indicated that not all tables which had any DMLs were getting into the 'stale category'. I checked the ratio A/B where: A is the sum of inserts+deletes+updates from user_tab_modifications B is num_rows from user_tables (or user_tab_partitions).   I observed that if this ratio exceeded 10%, package dbms_stats analyzed the objects with 'GATHER STALE' option. (But I get error for the partitioned tables with this option).   Anand      >>> [EMAIL PROTECTED] 10/23/01 05:20PM >>> Anand, Just curious : Is there some test or other observation that you can share with the list about dbms_stats using 10% as a boundary for staleness? John Kanagaraj 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. -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: John Kanagaraj   INET: [EMAIL PROTECTED] Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051 San Diego, California        -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from).  You may also send the HELP command for other information (like subscribing).