Oracle database help

We currently have Oracle 11G with a single database running on a virtual machine in an ESXi 5 server.  We want to create another database for reporting.  There is potential that the reporting database is going to be very processor intensive and we are afraid it would affect the performance of the existing database.  With that said, would it be a good idea to create a new virtual machine with its own instance of Oracle installed instead of creating a new database on the existing instance?  Is it possible to isolate resources so that one database cannot use all of them?
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slightwv (䄆 Netminder) Commented:
You can probably do this at the database level but probably better controlled through VMWare.  I'll let the VMWare Experts comment on that.

In Oracle you can tell an instance how much CPU it can have.  This is called "Instance Caging":

Amount of memory is controlled through the spfile paramaters.

Instead of worrying about data migration between the online and reporting database also check the link above and look into consumer groups.

You can tell the 'reporting' sessions they are a lower priority and maybe use the single database for everything.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would create a new VM for this Reporting Database.

You can set resources on CPU and Memory, so the CPU and Memory are GUARANTEED, e.g. ringfenced so resources CPU and Memory are taken away from the VM.

So on the original Oracle DB VM, set Reservations for CPU and Memory.

It's called setting CPU and Memory Reservsations.

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