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General Questions


amm vs asmm?


I am configuring some systems for huge memory pages on linux and I see in all of the docs that I have read that it says that AMM (automatic memory mgmt) is not compatible with hugepages memory but that ASMM (automatic shared memory mgmt) is compatible with hugepages memory? I am confused as to the differences between AMM and ASMM? Can someone enlighten me on this subject? Thanks.

AMM manages the entire memory of the instance with the parameters memory_max_target and memory_target.  ASMM manages only the SGA with sga_max_size and sga_target, PGA you have to manage separately with pga_aggregate_target

also AMM is available only from 11g and ASMM was available from 10g.

923395 wrote: I am configuring some systems for huge memory pages on linux and I see in all of the docs that I have read that it says that AMM (automatic memory mgmt) is not compatible with hugepages memory but that ASMM (automatic shared memory mgmt) is compatible with hugepages memory? I am confused as to the differences between AMM and ASMM? Can someone enlighten me on this subject? Thanks.  Besides the answer of John, have a read of these two posts which explains that why AMM doesn't use Huge Pages. http://kevinclosson.wordpress.com/2007/08/23/oracle11g-automatic-memory-management-and-linux-hugepages-support/ http://blog.tanelpoder.com/2007/08/21/oracle-11g-internals-part-1-automatic-memory-management/  HTH Aman....

Thanks for the replies, wiish I could give credit to all.


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