包括描述实例数据库的内存区。
This includes memory areas that describe the databases on the instance.
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
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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