Arup Here is small cut out from one of the Oracle Openworld presentation title" ORACLE DATABASE 10 g TIME NAVIGATION: HUMAN ERROR CORRECTION" by Tammy Bednar from Oracle "New in Oracle Database10g is the ability to query data in the past for more than 5 days if the UNDO_RETENTION is set for greater then 5 days. Oracle will maintain the undo for that period of time as long as the Undo Tablespace datafiles are allocated enough disk space" Now I am surprised with the result mentioned by one of the expert in earlier email in the list that he tested it with more than 5 days. The only exception I can count is -->either if the database is down for few days and then in that case SMON_SCN_TIME can have timestamp for more than 5 days OR --> If the SCN flashback method is used and not the Timestamp. Also the Timestamp Mapping to SMON_SCN_TIME are been referred at lot of places like here is one of the presentation link http://www.aoug.at/Files/doag2003_x.pdf Also this is been mentioned by Kirti in one of his presentaion slide named " Back to th past with Oracle 9i Flashback query" Thanks Indy Johal Manager, Database Administration PR Newswire indy_johal@xxxxxxxxxxxxxx http://www.prnewswire.com (201) 946-5687 [W] (201) 400-3960 [M] "We tell your story to the world." "Arup Nanda" <orarup@xxxxxxxxxxx> Sent by: oracle-l-bounce@xxxxxxxxxxxxx 02/12/2004 10:16 PM Please respond to oracle-l To: <oracle-l@xxxxxxxxxxxxx> cc: Subject: Re: Undo Retention of 5 days; anyone? Indy, Thanks for the update on the SCN time limitation. I wasn't thinking about that. If you do find some information on that limitation, I'll appreciate if you could please share that with me. The theretical limit of undo_retention is some 136 years! Thanks. Arup ----- Original Message ----- From: "Indy Johal" <Indy.Johal@xxxxxxxxxxxxxx> To: <oracle-l@xxxxxxxxxxxxx> Sent: Thursday, February 12, 2004 4:27 PM Subject: Re: Undo Retention of 5 days; anyone? > Arup > If I am correct, can we go beyond 5 days of Flashback recovery using > Timestamp method in Oracle 9i. I know somebody referred earlier in the > mail that he recover the data which is older than 15 days. I know that > some documentation says that it is not possible as timestamp mapping to > SCN is maintained in SMON_SCN_TIME for only 5 days. I am not having any > configuration to test it so thought I can check with you. > > Thanks > > Indy Johal > http://www.prnewswire.com > > (201) 946-5687 [W] > (201) 400-3960 [M] > > "We tell your story to the world." > > > > > "Arup Nanda" <orarup@xxxxxxxxxxx> > Sent by: oracle-l-bounce@xxxxxxxxxxxxx > 02/12/2004 12:42 AM > Please respond to oracle-l > > > To: <oracle-l@xxxxxxxxxxxxx> > cc: > Subject: Undo Retention of 5 days; anyone? > > > List, > I have a very unusual request from users to have UNDO_RETENTION set to 5 > days. Normally I set to about 5 hours, not days. Don't ask why. They have > inherited a bad design that requires flashing back to 5 days ago and, no, > they can't redesign it. > > I'm curious if anyone has actually done it, i.e setting it to a very high > value. Any input will be highly appreciated. > > Thanks a lot in advance. > > Arup > ---------------------------------------------------------------- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > ---------------------------------------------------------------- > To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx > put 'unsubscribe' in the subject line. > -- > Archives are at //www.freelists.org/archives/oracle-l/ > FAQ is at //www.freelists.org/help/fom-serve/cache/1.html > ----------------------------------------------------------------- > > > > > ---------------------------------------------------------------- > Please see the official ORACLE-L FAQ: http://www.orafaq.com > ---------------------------------------------------------------- > To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx > put 'unsubscribe' in the subject line. > -- > Archives are at //www.freelists.org/archives/oracle-l/ > FAQ is at //www.freelists.org/help/fom-serve/cache/1.html > ----------------------------------------------------------------- > ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------