How to determine the # of instances one needs?

Hi,
Our current Oracle environment (1 physical instance) houses a data warehouse, 1 data mart, oracle BI and Oracle Spend Analytics. What is a good approach to investigate if my current instance is powerful enough to sustain the various applications? I am afraid that as more users use the various apps - performance will degrade.
Please point me to readings that may educate me further, thanks much.

user4422426 wrote:
Hi,
Our current Oracle environment (1 physical instance) houses a data warehouse, 1 data mart, oracle BI and Oracle Spend Analytics. What is a good approach to investigate if my current instance is powerful enough to sustain the various applications? I am afraid that as more users use the various apps - performance will degrade.
Please point me to readings that may educate me further, thanks much.There is always one instance only per database irrsepective of the applications using that database. The only time/option , when you can have more than one instance per database is when you implement Real Application Clusters for the database where you would end up with more than one instance per database running on different machines . Now, if all what you have got is one machine, and is powerful enough( instance is not powerful, its the machine over which it runs, is supposed to be), you are better to live off with one instance. But if you are seeing that you want to scale futher and can't go for a more bigger, powerful one machine, you can join multiple , somwhat smaller capacity machines together and can implement a RAC database. This is called scaled up using RAC. Performance is not just based on instance numbers or user count but also on many different aspects like design, coding, IO . Before you do decide to change anything, make sure that you have done a thorough testing .
Aman....

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