RE: Running multiple instances on a [large] server

We are running 11 instances on WinNT with no problems! At one point, we had 26 instances. they are all development instances, so volumn and load are low. but they all share one Oracle Home.

Tom Mercadante
Oracle Certified Professional

-----Original Message-----
Sent: Tuesday, March 11, 2003 9:19 AM
To: Multiple recipients of list ORACLE-L

I can't remember the last time that I saw a server (other than WinNT) running a single instance. My experience is that it's quite normal to run multiple instances on a single server.

One Oracle home per version of Oracle. I'm not sure what the point of a separate Oracle home per instance would be.

On the licensing issue --- that's Oracle's call. We have a site license so it's not an issue for me.  

                      Hemant K Chitale

                      <hkchital                To:      Multiple recipients
of list ORACLE-L <ORACLE-L_at_fatcity.com>                    
                      @singnet.com.sg>         cc:

                      Sent by: root            Subject: Running multiple
instances on a [large] server                                 
 

 

                      03/11/2003 03:48

                      AM

                      Please respond

                      to ORACLE-L

 

 

One of the teams here is planning to run anything from 8 to 16 database instances [no indication on sizing yet, but gut-feel SGAs are 200MB to 1GB and DB sizes 500MB to 40GB] on a "large" server, something like a Sun E6800 or an equivalent HP or Fujitsu server.

1. How many of you do run, and are comfortable running, multiple databases on the same server, whether it is "partitioned" or not ?
2. Do you create a seperate ORACLE_HOME for each instance ?
3. Do you just buy the Oracle DB CPU license on the total number of CPUs on the server ?

My positioning is
a. We might not be able to create 8 partitions but partition such that we have a max of 2 or 3 instances in one partition. Hopefully, I can dynamically change CPU partitioning to reallocate CPU to another group of instances.

b. Each instance should have it's own ORACLE_HOME. [Disk space is not a constraint].

c. Just add up the number of CPUs on the server, across all partitions, and buy a CPU license. Also, a CPU license is much preferable to Named-User as some of these databases would host Portals for 1,000+ end-users.

Hemant K Chitale
http://hkchital.tripod.com

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