RE: Log Switches in RAC
- From: Martin Brown <martinfbrown@xxxxxxxxxxx>
- To: <rajesh.rao@xxxxxxxxxxxx>, <surachart@xxxxxxxxx>
- Date: Tue, 10 Nov 2009 20:20:28 -0500
It is my understanding that the RDBMS does this so as to not allow an instance
to lag too far behind. You should also check lag_archive_target to see if it's
set. It's for the same purpose.
From: Rajesh.Rao@xxxxxxxxxxxx
To: surachart@xxxxxxxxx
CC: oracle-l@xxxxxxxxxxxxx
Date: Tue, 10 Nov 2009 13:33:36 -0500
Subject: RE: Log Switches in RAC
Sorry, I mean, other than the alter system commands, Why and when would a log
switch on one instance of a RAC trigger cause log switches to happen across one
or more of the other instances?
From: Surachart Opun [mailto:surachart@xxxxxxxxx]
Sent: Tuesday, November 10, 2009 1:24 PM
To: Rajesh Rao
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Log Switches in RAC
If you are meaning switch log by manual...
"alter system switch logfile"
This command switches log on that instance.
"alter system archive log current"
This command switches log all instance in RAC
Example:
SQL> alter system switch logfile;
System altered.
SQL> alter system archive log current;
System altered.
Good Luck
Surachart Opun
http://surachartopun.com
On Wed, Nov 11, 2009 at 1:11 AM, Rajesh Rao <Rajesh.Rao@xxxxxxxxxxxx> wrote:
Why and when would a log switch on one instance of a RAC trigger cause log
switches to happen across one or more of the other instances?
Thanks
Raj
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