IF database-> RAC database: estimate of the size of the SGA for each instance

Hello!

Let's say that there is a single instance with SGA 100 G size DB (assume this size is optimal for this database).

If this database is intended to be converted to a RAC database with 2 instances (suppose DB workload will be spread over multiple instances).

How to estimate the needs of SGA size for each instance in the RAC database?

It takes 50G + General cool CARS (say 15%) for each instance?

(Do not consider situation when one of the instances has failed, and all the charge redirects to an instance having survived)

I'd be grateful if someone has offered or provided useful references.

---

Kind regards

Kyrylo

As a general rule, I would size the SGA on new nodes to 120% of the SGA to single instance. Yes, this means that you will more than double the size of the SGA. You will need additional space to hold the load memory Cache Fusion. And the buffer Cache are possibly a little more space to store additional versions of blocks that seem to accompany the many implementations of CARS. Now, it's just a rule of thumb, so it has a high degree to be very wrong.

You'll want to consider two big things... (1) the service being used. Will you take advantage of the services to perform the partitioning application? If so, instances can see various workloads that can lead to requests for different resources. (2) you will support a kind of failover (TAF or manual failover) applications? If so, then the LMS must be sufficiently sized to support the additional workload.

See you soon,.
Brian

Tags: Database

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