Re: Question on RAC user-managed recovery
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>, <racdba@xxxxxxxxxxxxx>
- Date: Thu, 12 Jan 2006 22:54:48 -0000
It's just part of the way that RAC works.
You have three nodes that are independent; they
re-synchronize their SCNs very frequently - but
in principle could delay re-synchronization for about
3 seconds. So if you happened to have three transactions
take place one the three separate nodes just after a
re-synch, then all three nodes would have to commit
at the same SCN.
Regards
Jonathan Lewis
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----- Original Message -----
From: "Hameed, Amir" <Amir.Hameed@xxxxxxxxx>
To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>; <racdba@xxxxxxxxxxxxx>
Sent: Thursday, January 12, 2006 10:37 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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