Shmmax for 64bit redhat w/16GB Memory

I'm getting conflicting responses for what should be the correct shmmax setting on a Linux system. I currently have 8GB of memory and about to add another 8GB totaling 16GB, I am then going to make my MAX_SGA_SIZE 10GB. Should I be setting the shmmax to 50% of physical memory making it configure multiple memory segments on sga startup, or should I configure shmmax to say 12GB in order to get my 10GB SGA into 1 memory segment. I'm seeing some people say that the 1 memory segment is the way to go, but then I also see on Linux to configure it to 50% of total memory...does linux do better with multiple memory segments or something? Any help is appreciated, thx!

Absolutely no damage. It's a number only used when the shared memory segment is created. It's checked to see if this number is smaller than the size of the shared memory segment to be created.

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