We run upto 22 instances on large SUN boxes... Each environment has their own oracle home, own file system, and in some cases-their own UNIX account for the environment..
One loses a little space for the multiple oracle homes, and it does add some overhead for the operations.. But when we need to migrate a database to a new server;we can shutdown the DB-umount,mount on the new system, and crank it up.
We have been in a situation where the machine resources choked, and we were able to move a couple of databases with less than a 3 minute hit for an outage. Would have been less if the operations guys(SA's) had things tee'd up, and ready to hit it with the Driver too.
greg
-----Original Message-----
From: Hemant K Chitale [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, March 11, 2003 3:49 AM
To: Multiple recipients of list ORACLE-L
Subject: Running multiple instances on a [large] server
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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Author: Hemant K Chitale
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