How many cores i need for my new instance? 6 instances+ASM instances+new instance

we have a server database with 6 instances rdbms+ asm instances. We want to add a new instance.
Is there any formula or rule that is a reference to determine the number of cores to assign to my new instance?
My new instance are going to have 900 gigas of data, and 29 gigas of memory targer, and CORES?? i don´t know it, i need help

Hi,
>>we have a server database with 6 instances rdbms+ asm instances. We want to add a new instance.
>> Is there any formula or rule that is a reference to determine the number of cores to assign to my new instance?
>> My new instance are going to have 900 gigas of data, and 29 gigas of memory targer, and CORES?? i don´t know it, i need help
How have been assigning the cpu_cores to existing databases and ASM ?
Please read this now, Instance Caging, which explains how can you divide CPU Cores among different database running on a server:
http://www.oracle.com/technetwork/database/performance/instance-caging-wp-166854.pdf
When you add a new instance you also need to consider about available free memory on the server and additional IOs going to the disks. If you IO is already saturated then probably need to request new storage etc.
HTH,
Pradeep

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