RE: Resetlogs and new incarnation
- From: "Mark W. Farnham" <mwf@xxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 3 Jan 2006 13:40:44 -0500
The "instance" number has to do with RAC and a particular set of memory and
processes running on a given database (loosely put, the files).
Without RAC, you'll have exactly one instance (unless you're a dinosaur
running OPS, in which case, eew.)
Are you thinking about the "thread" number in your archive log format
setting (which corresponds to instance)?
On resetlogs, the sequence number of the logs is indeed reset, and the
previously made archived redo logs have nothing to do with your
recovery process of the current files of the database any more, except
perhaps research via logminer on how you got to where you are.
Now you've also used the word "incarnation." In this sense are you talking
about RMAN incarnations? If not, what?
Regards,
mwf
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of
Jill.Drocea@xxxxxxxxxxxxxxxxxxx
Sent: Tuesday, January 03, 2006 9:04 AM
To: oracle-l@xxxxxxxxxxxxx
Cc: Jill.Drocea@xxxxxxxxxxxxxxxxxxx
Subject: Resetlogs and new incarnation
I'm using 10g and exercising backups through resetlogs.
Command:
select INSTANCE_NUMBER, INSTANCE_NAME from v$instance;
INSTANCE_NUMBER INSTANCE_NAME
--------------- ----------------
1 XYZ_SID
I issued point-in-time recovery followed by
alter database open resetlogs;
select INSTANCE_NUMBER, INSTANCE_NAME from v$instance;
INSTANCE_NUMBER INSTANCE_NAME
--------------- ----------------
1 XYZ_SID
SQL
select SEQUENCE#, resetlogs_change#, resetlogs_time from v$log_history
Shows the sequence# reset to 1 and the sequence number in my archive file
name has been reset to 1. My log_archive_format is set to
xyz_sid_%S_%t_%r.arc. Below you can see that my sequence number was reset.
Xyz_sid_0000000022_1_575652460.arc
Xyz_sid_0000000001_1_578653176.arc
I expected a new instance_number without resetting the sequence number. Is
my assumption correct?
Jill Drocea
Oracle DBA
Verizon Wireless
845-365-7465
Jill.Drocea@xxxxxxxxxxxxxxxxxxx
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