Oracle and CPU Affinity



What is CPU affinity and how can it help with my Oracle system?

A reader asks:

Question: I have a 32 CPU Linux server with four large applications, and I want to dedicate 4 banks of 8 CPUs to each application. Is CPU affinity a good practice for Oracle?

So, what do the experts say?

Answer: Processor (CPU) dedication is called CPU affinity, and it has been used for decades on large mainframe computers.

Today, CPU affinity is a common technique used on large Oracle servers with dozens of applications and Oracle databases to keep any single application from hogging all of the processing power. The downside, of course, is that one application may suffer CPU enqueues, as evidenced by the "r" column of vmstat output.

Follow the jump below for further insight and links to more information on CPU affinity:

CPU Affinity Dedicated Processors

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