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We are about to add a Reporting Data Warehouse to our system. Currently we are using Oracle 10g for our transaction database. Should we put the Reporting Warehouse on physically different hardware? or can we “go cheap” and share the Transaction Server?
If you have a disaster recovery machine for your OLTP, you might be able to use that for your warehouse.
Another option is to go for two virtual machines on the same hardware.
You can use the VM
management to allocate min/max
memory, CPUs etc.
If one database needs an urgent
patch, you don’t have to worry about
it affecting the other database.
It also becomes simpler to move one
off to its own hardware later, if it
proves necessary.
If you use a different server, what is your storage ? If they are coming off the same shared disks, they can still impact each other, even with separate CPU/memory.