Thanks man, I mean the minimum optimal size base on the maximum transaction size, So the HWM is the answer ?
Sinardy -----Original Message----- Sent: 03 June 2002 16:53 To: Multiple recipients of list ORACLE-L > >Hi all,=0D >=0D >How to find out the smallest (minimal) transaction >size from Dictionary vie= >w or base tables =0D >I try to set my OPTIMAL rollback segment base on >smallest transaction size = >to prevent ora-1555. since shrinking rollback >segments may cause ora-1555.= >=0D >=0D >=0D >Thanks =0D >=0D >Sinardy=0D >--=0D Smallest ? Are you sure that you do not mean greatest ? Opinions diverge about OPTIMAL. As far as I am concerned I like it on databases where you may have occasionally very big changes. Look at V$ROLLSTAT. You have there the average amount of rollback segment used, as well as the high-water mark. You can use those values to derive something looking common-sensical. Alternatively, I think that there is in the 'X-rated' section of the Oriole site (http://www.oriole.com) something to set OPTIMAL automatically (don't worry, even with this name it contains nothing illegal in Singapore :-)). Even if you do not run the script as is, looking at what it does - and possibly questioning it - may give you the answer you are looking for. Regards, Stephane Faroult Oriole -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Stephane Faroul 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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Sinardy Xing 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).
