包括描述实例数据库的内存区。

This includes memory areas that describe the databases on the instance.

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私有排序内存区的大小是不受限制的。

The size of the private sort memory area is unrestricted. The SHEAPTHRES parameter is applied differently for private and shared sorts

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调用mem_init，它计算各种区域、高内存区等内的页面数量。

Calling mem_init, which calculates the number of pages in various zones, high memory, and so on.

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