这是因为 Oracle 使用大量的虚拟内存，特别是对于其系统全局区域（SGA），这个区域用于缓存表数据和其他东西。

This is because Oracle uses a lot of virtual memory, particularly with respect to its System Global Area (SGA), which is used to cache table data, among other things.

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虽然不支持先在全局区域(global zone)上安装db2，然后再继承到其他区域，但在一个或多个本地区域上直接安装DB 2却没有限制。

While installing DB2 on the global zone and then inheriting that installation to other zones is not supported, there are no restrictions on installing DB2 on one or more local zones directly.

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一般来说，要想定义为THREADSAFE，例程不应该使用任何全局或静态数据区域。

In general, to be THREADSAFE, a routine should not use any global or static data areas.

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