Thanks for the reply Dan. Would you suggest setting UNDO_RETENTION to roughly the length of time of the longest running job in the database? For example, in our DW, our BI analysts tell me that their longest batch run is about 1 hr 45 minutes. My uneducated guess is to accordingly set the parameter to approx 2 hours.
-----Original Message----- Sent: Friday, September 26, 2003 4:15 PM To: Multiple recipients of list ORACLE-L That is a good place to start. You might consider adding a little if you have many concurrent transactions or want to increase the undo_retention to a high number. Once you are using AUM, keep a close eye on v$undostat, though there are some known issues with it not populating properly, keep an eye on the begin_time and end_time. However, for estimation purposes it should work. Daniel Fink Thomas Jeff wrote: > I'm beginning the process of converting over to automatic > undo management. I'm wondering as to exactly how large to > initially build the UNDO tablespace. Make it roughly > the same size as the sum of the current rollback > tablespaces? Or has your experience been different, > i.e., you've found you've generally needed more or less > space with respect to the previous allocation for rollback > segments (manual undo)? > > Thanks. > > -------------------------------------------- > Jeffery D Thomas > DBA > Thomson Information Services > Thomson, Inc. > > Email: [EMAIL PROTECTED] > > Indy DBA Master Documentation available at: > http://gkmqp.tce.com/tis_dba > -------------------------------------------- > > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Thomas Jeff > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > 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.net -- Author: Thomas Jeff INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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).
