Ethan,
The points you make are valid. There will be some resource wastage
due to the overhead of each instance and database, but the potential
downside may make it worthwhile. Suppose customerA's application has a bug
generates a ton of redo, overflowing the archive_dump_dest. This means that
customerB's (and all others) data is unavailable and applications will begin
to malfunction. Imagine telling irate CustomerB that they are down because
of CustomerA! This also simplifies backup and recovery requirements that
differ between customers.
There will be some performance penalties, but a sufficiently
powerful machine should be able to mask them.
-----Original Message-----
Sent: Thursday, August 01, 2002 4:44 PM
To: Multiple recipients of list ORACLE-L
I am going to reply to this myself before I get flamed. I found a recent
discussion on usenet regarding this topic.
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=3d1091af
%240%2428006%24afc38c87%40news.optusnet.com.au&rnum=15&prev=/groups%3Fq%3Dto
o%2Bmany%2Binstances%2Bgroup:comp.databases.oracle.server%26hl%3Den%26lr%3D%
26ie%3DUTF-8%26oe%3DUTF-8%26start%3D10%26sa%3DN
Basically everyone is against this idea. However no actual technical
details are provided to explain why this could not be done in a production
environment with the right sized machine. The scenario presented in which
one would want 20 instances on a machine is in a class room setting.
However, my scenario would be acting as an ASP. Each instance would support
a different customer. My fear with splitting customers up into different
schemas on the same instance is that I don't want to interupt other
customers if recovery is required. This would have to be a tablespace point
in time reco since we would only want to reco one customers data. Perhaps
this isn't as big an issue if we go with RMAN?
Ethan Post
(972) 577-6552
[EMAIL PROTECTED]
perotdba (AIM), epost1 (Yahoo)
--------------------------------------------------------------------
-----Original Message-----
Sent: Thursday, August 01, 2002 4:58 PM
To: Multiple recipients of list ORACLE-L
I got a request to spec out a machine that could handle 20 separate Oracle
instances on a single UNIX server. SGA should total about 500 MB per
instance. We have some hosts here with 6-8 instances but never tried 20
before. Wondering what types of things I should be worried about, obviously
having enough memory but are there any other limitations I can expect?
Anyone had to do this?
Thanks,
Ethan
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