Re[2]: Running multiple instances on a [large] server

Thomas,

    Now that's an interesting comment. I can't remember ever seeing more than one instance on an NT machine either except when we were playing around & boy did that crash in a big hurry (NT 4.0 Oracle 8.0). On the other hand I've set up Linux with 4 instances (same piece of hardware) and had no problems. Got to love the Penguin.

Dick Goulet

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Author: "Thomas Day" <tday6_at_csc.com>
Date:       3/11/2003 6:19 AM

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                                          
                                                      
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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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