Re: Question on RAC user-managed recovery
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: <Amir.Hameed@xxxxxxxxx>, "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 19 Jan 2006 12:58:32 -0600
Question on RAC user-managed recoveryHi,
The recovery start SCN is common in the first lines because recovery has to
read redo from the smallest checkpoint SCN found in controlfile checkpoint
progress records (or datafile headers if recovering using backup controlfile
option).
And this information is database specific, global to all RAC instances
servicing your database, thus all redo threads have to be scanned from the same
SCN.
Tanel.
----- Original Message -----
From: Hameed, Amir
To: ORACLE-L ; racdba@xxxxxxxxxxxxx
Sent: Thursday, January 12, 2006 4:37 PM
Subject: Question on RAC user-managed recovery
Folks,
I am running some time-based database instance recovery tests in the lab on a
three-node RAC environment. The following command was issued from one RAC
instance while the others were down. I am trying to understand the way the
change number (change 7286467501233) is being displayed on the first line of
each of the first three threads below. Why is this number common here? After
that, this number is distinct in each subsequent archived log file. I would
appreciate if someone can explain/clarify it for me.
Thank you
Amir
SQL> recover database until time '2006-01-12:15:20:00' using backup
controlfile
ORA-00279: change 7286467501233 generated at 01/11/2006 14:38:59 needed for
thread 1
ORA-00289: suggestion : /u107/oradata/archives/e52rac/log_1_778.dbf
ORA-00280: change 7286467501233 for thread 1 is in sequence #778
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 7286467501233 generated at 01/11/2006 14:38:35 needed for
thread 2
ORA-00289: suggestion : /u107/oradata/archives/e52rac/log_2_463.dbf
ORA-00280: change 7286467501233 for thread 2 is in sequence #463
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 7286467501233 generated at 01/11/2006 14:38:37 needed for
thread 3
ORA-00289: suggestion : /u107/oradata/archives/e52rac/log_3_408.dbf
ORA-00280: change 7286467501233 for thread 3 is in sequence #408
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 7286467508134 generated at 01/11/2006 14:43:27 needed for
thread 2
ORA-00289: suggestion : /u107/oradata/archives/e52rac/log_2_464.dbf
ORA-00280: change 7286467508134 for thread 2 is in sequence #464
ORA-00278: log file '/u107/oradata/archives/e52rac/log_2_463.dbf' no longer
needed for this recovery
..
..
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