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 <[EMAIL PROTECTED]>
@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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