Auto Start five instances in one server
Guru´s
I have a server with five instances. When I restart the server randomly I have problems with some instances. (they do not rise).
In services (windows) I see all the services fine. But in EM I see that instance is down...
Is there a problem in windows when I have 5 instances ?? (in order to after a restart of the server some instances does not start)??
> Is there a problem in windows when I have 5 instances ??
Yes. Absolutely. It does not make any technical sense.
You now have to spend memory on 5 SGAs, and resources on 5 process monitors, 5 system monitors, database writers, log writers and so on.
Not to mention that you need 5 temp tablespaces, 5 sets of redo logs, undo spaces, etc.
Why? What does make 5 small SGA's better than a single large SGA? Or temp space? Or process monitor?
Do you think you scale that way? Oracle scales the exact opposite way. Instead of more physical databases (each needing an instance), Oracle's top end product called RAC scales by using a single physical database and adding more instances to that database - one instance per server.
Granted, there are exceptions where one may want to run multiple instances. Oracle 9i and 10g during a porting project. Forced to do so by using shrink wrap software that uses an "embedded" Oracle database.
But these are by far the exception of the rule. And unless you have a mother of server with virtualisation, what you are doing using Oracle, does not make any technical sense.
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