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abou AMM

原创 Oracle 作者:warmbreeze 时间:2017-03-24 10:51:11 0 删除 编辑
在12cR2的文档中建议使用AMM
About Memory Management (page 6-2)
The memory structures that must be managed are the system global area
(SGA) and the instance program global area (instance PGA). Oracle
Database supports various memory management methods, which are
chosen by initialization parameter settings. Oracle recommends that you
enable the method known as automatic memory management.

但是实际情况是不建议使用AMM, 使用DBCA建库时如果物理内存大于4G, 不允许使用AMM

[DBT-11211] The Automatic Memory Management option is not allowed when the total physical memory is greater than 4GB.

参考
12.2:[INS-35178]The Automatic Memory Management Option Is Not Allowed During RunInstaller or Using DBCA If Physical Memory Is Greater Than 4G. (文档 ID 2244817.1)

实践证明AMM只是个鸡肋

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