Oracle11g已知的将要推出的新特性之一是-自动内存管理
Oracle在Oracle9i中引入了自动PGA调整；在Oracle10g中引入了自动SGA调整；而在11g中，通过设置一个参数，Oracle可以自动调整所有的内存使用，这被称为自动内存管理(Automatic Memory Management).
如果这项功能被缩写为AMM，那么Oracle已经有了:
ASSM
ASM
AMM
AUM
ADDM
AWR
......
这一新引入的参数据说是:MEMORY_TARGET
那么Oracle在内存管理方面已经有了一下主要几个TARGET:
SGA_TARGET
PGA_AGGREGATE_TARGET
MEMORY_TARGET
而MEMORY_TARGET 这个参数将最终将DBA从内存管理中解放出来。
英文原文如下:
MEMORY_TARGET specifies the Oracle system-wide usable memory. The database tunes memory to the the MEMORY_TARGET value, reducing or enlarging the SGA and PGA as needed.In a text initialization parameter file, if you omit the line for MEMORY_MAX_TARGET and include a value for MEMORY_TARGET , the database automatically sets MEMORY_MAX_TARGET to the value of MEMORY_TARGET . If you omit the line for MEMORY_TARGET and include a value for MEMORY_MAX_TARGET , the MEMORY_TARGET parameter defaults to zero. After startup, you can then dynamically change MEMORY_TARGET to a non-zero value, provided that it does not exceed the value of MEMORY_MAX_TARGET .
