RE: RAC 11gR1 changing control files

  • From: "Chitale, Hemant Krishnarao" <Hemant.Chitale@xxxxxx>
  • To: <JC1706@xxxxxxx>
  • Date: Wed, 7 Sep 2011 09:56:41 +0800

Interesting idea.  Drop a controlfile in a rolling manner.

Unfortunately, it won't work.  The controlfile is, in a sense, "outside" of the 
database  --- it actually allows the Instance to identify the physical 
components of the Database.  Thus, there is no "DROP CONTROLFILE" or "ALTER 
CONTROLFILE OFFLINE" command.

You will have to shutdown all the instances of the database, edit the parameter 
file and restart the instances.  
Ouch !

  
Hemant K Chitale 

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of CRISLER, JON A
Sent: Wednesday, September 07, 2011 4:24 AM
To: 'oracle-l@xxxxxxxxxxxxx'
Subject: RAC 11gR1 changing control files

I ran into a situation where we have 5 control files, and one of these control 
files is going into a ASM diskgroup used for online redo logs.  We are also 
using a storage snapshot product (NetApp Snapshot Manager for Oracle).  
Normally the product would not get a snapshot on a volume that only has redo, 
but since it has a control file on it, we are then forced to track snapshots 
for redo, which is very expensive in resources.  The fix is to drop the control 
file from that ASM diskgroup.

Which brings me to my question: can I change the control_file parameter to omit 
that specific control file (I will still have 4 other copies) and bounce the 
instances in a rolling fashion? Or do all instances have to be shutdown so that 
the control file parameter is always consistent ? 
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