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Running multiple instances on a [large] server

From: Hemant K Chitale <>
Date: Tue, 11 Mar 2003 00:48:42 -0800
Message-ID: <>

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

Please see the official ORACLE-L FAQ:

Author: Hemant K Chitale

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