RE: Multiple Instance in Unix
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxx>
- To: Amir Gheibi <gheibia@xxxxxxxxx>
- Date: Fri, 7 Aug 2009 07:57:02 -0400
Yes, exactly. But also, keep in mind, if, for example, you have an /etc/oratab
that looks like this:
db1:/oracle/product/10.2.0:Y
db2:/oracle/product/10.2.0:Y
Then, you can do:
. oraenv
and enter 'db1' or 'db2' to switch ORACLE_HOME and ORACLE_SID to appropriate
values for the instance you want to work on.
Then, if you do:
sqlplus / as sysdba
You'll be connected as SYS to whatever instance is running w/ that ORACLE_HOME
and ORACLE_SID.
But, keep in mind, once both instances are up and running, if you just want to
connect to one or the other as a non-SYS user, you don't need to keep running
'. oraenv'. You can just do 'sqlplus yourusername@db1' or 'sqlplus
yourusername@db2' to get to whichever instance you need. (Assuming of course a
proper listener.ora and tnsnames.ora setup.)
Hope that helps,
-Mark
________________________________________
From: Amir Gheibi [gheibia@xxxxxxxxx]
Sent: Friday, August 07, 2009 4:44
To: Bobak, Mark
Cc: ORACLE-L
Subject: Re: Multiple Instance in Unix
Hi Mark,
Thanks for the swift reply. Appreciate it.
But if re-set ORACLE_SID to the new SID and keep the ORACLE_HOME, how would I
access to the first instance? Change ORACLE_SID back to the old SID whenever is
needed?
~ Amir
On Fri, Aug 7, 2009 at 4:25 PM, Bobak, Mark
<Mark.Bobak@xxxxxxxxxxxx<mailto:Mark.Bobak@xxxxxxxxxxxx>> wrote:
Hi Amir,
This is a common practice. There is no need to create a new OS user. You can
even create a new database under the same Oracle home.
The thing to keep in mind is that the combination of ORACLE_SID and ORACLE_HOME
need to be unique. So, that will uniquely identify an instance on a host, and
then that instance's pfile/spfile will point to your database's control
file(s). In that way, your new instance will clearly identify which database
it will mount and open.
Hope that helps,
-Mark
________________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>
[oracle-l-bounce@xxxxxxxxxxxxx<mailto:oracle-l-bounce@xxxxxxxxxxxxx>] On Behalf
Of Amir Gheibi [gheibia@xxxxxxxxx<mailto:gheibia@xxxxxxxxx>]
Sent: Friday, August 07, 2009 4:18
To: ORACLE-L
Subject: Multiple Instance in Unix
Hi listers,
I have a HP Unix box that has Oracle 10g R2 installed on it. There is already
an instance running and a database attached to it.
I need to create another instance and database. There is no X Server installed
on the OS. I created the first database through command line.
My question is whether I have to create another OS user in order to create the
new instance? Or I can use the same OS user (oracle:dba) to create the new
instance? As I need to set environment variables then if I use the same OS
user, what would happen to the first instance?
Is there a guideline on how to do this?
Thanks.
~ Amir Gheibi
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