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Oracle11g的新特性:自动内存管理

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Release: 2016-06-07 15:09:51
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欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 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,

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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 .

我们只能说Oracle越来越自动化了,在易用性方面,Oracle一直不懈的努力的确惹人瞩目。

-The End-

Oracle11g的新特性:自动内存管理

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