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AMM is Automatic Memory Management: incompatible with huge pages, enabled with memory_target.
ASMM is Automatic Shared Memory Management, enabled with sga_target.
Doea that help?
AMM is not supported.
Shell Script to Calculate Values Recommended Linux HugePages / HugeTLB Configuration [ID 401749.1]
Automatic Memory Management (AMM) cannot be used becuase The Automatic Memory Management (AMM) and HugePages are not compatible.. Let oracle doc help you see http://docs.oracle.com/cd/B28359_01/server.111/b32009/appi_vlm.htm#CACDCGAH
So does thas mean that if I disable AMM by setting the memory_target=0 then I will have to give a value for the sga_target?
Yes you should set sga_target to non zero if you set memory_target to 0 atleast to make sure ASMM is working which is good for the sake of SGA's cache efficiency as well as MMAN background processes transferring granuels to the components where required.
Thank you for your replies.