By looking at wait event "data file init write". If you did a trace or looked at active session history data, that will give you an idea. For the ash data you need a diagnostic pack license. Sent from my Verizon Wireless BlackBerry -----Original Message----- From: Joe Smith <joe_dba@xxxxxxxxxxx> Date: Sat, 13 Mar 2010 13:38:05 To: <oracle-l@xxxxxxxxxxxxx> Subject: cost of autoextend How do you measure the cost of a datafile autoextending? thanks. _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. http://clk.atdmt.com/GBL/go/210850553/direct/01/