Multiple Instances on single oracle home

Hi,
If i have multiple instances in a single oracle home
How can i know which instance is running (up)
to which table i fire query to find instances status
how to start single instance out of multiple instances
Thanks,
Mustang

mustang4455 wrote:
Hi,
If i have multiple instances in a single oracle home
How can i know which instance is running (up)
to which table i fire query to find instances status
how to start single instance out of multiple instances
These questions show a certain lack of knowledge about Oracle - which immediately says that you also do not know what you are doing ito performance and scalability of a Oracle and that server platform by running multiple instances on it.
In most case, running multiple instances is the wrong thing to do. It degrades performance. It does not and cannot scale. It is an exception to the basic fundamentals of client-server. And not just for Oracle.
You need sound technical justification for running multiple instances on a server. What is yours?

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Running multiple instances from same oracle home

Hi Gurus,
I am preparing for OCA 11g examination. I had a question about running multiple instances from same oracle home. While reading the book I came across a statement about database control which says "If there are several database instances running off the same Oracle home, then each will have its own Database Control instance".
Now I assume that this statement implies multiple instances accessing the same physical database (which as per my knowledge can happen only in case of a RAC).
I am not able to understand how exactly can you have multiple database instances in a single oracle home. I have installed Oracle 11g on my computer whose oracle home is +"D:\oracle\product\10.2.0\db_1"+; now this directory houses all the binaries (executables and folders like admin,bin, etc) for the oracle instance that I have installed (the instance name is ocp1). Now if I am to install or create another Oracle Instance (say ocp2) in the same home, wont there be a conflict of binaries of the two instances in the same home ?
Basically,it makes sense if db_1 folder is further split into multiple folders, one for each instance (for example, one for ocp1 & one for ocp2); each of these folders will then contain the binary files, libraries,etc for its own instance; but, this is not the case, here db_1 houses all the binaries directly under it ...
The other question which stems from the statement I mentioned above is that if having multiple instances running from same oracle home accessing the same physical database, can this arrangement be called RAC at all; or does RAC dictate that you cannot have multiple instances that are accessing the same database have to be installed on physically separate machines and so you cannot have two RAC instances (accessing same physical database) installed on the same computer ??
I hope my questions are not too much confusing ... !!
Cheers,
Sudripta

Hello,
"If there are several database instances running off the same Oracle home, then each will have its own Database Control instance".This is true, and also means each instance will have its separate database (i.e. dbf files etc.) & separate DB Control. Usually in this case you create several instances on the same node.
Now I assume that this statement implies multiple instances accessing the same physical database (which as per my knowledge can happen only in case of a RAC).You are correct about RAC where several instances (usually running on separate nodes) access the RAC.
More info:
1 Oracle Home - 1 Database - 1 SID is possible.
1 Oracle Home - Many Databases - Many SID is possible.
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I posted this last week, but it looks like the forums had a little "issue" recently . . .
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Multiple Oracle 9ias instances on single host

hi all
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hi all,
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Find oracle home

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DB : 8i and 10g and 11g
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VN
Edited by: user3266490 on Apr 24, 2012 4:41 PM

some times we started db with pfile from non default location?How to find where that pfile located?you cannot find the nondefault location of pfile ..
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--neeraj

Multiple Instances on single oracle home

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