... SUA Single Unit Address 单一设备地址 SUA System Use Area 系统使用区 SUB SUBstitution 替代，置换 ...
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这是因为Oracle使用了大量的虚拟内存，特别是对于其系统全局区(SGA)。
This is because Oracle USES a lot of virtual memory, particularly with respect to its System Global Area (SGA).
TOC保存区、编译器区和链接器区都会为系统使用而预留出来，程序员不能对它们进行修改，但是必须要为它们预留空间。
The TOC save area, compiler area, and linker area are all reserved for system use, and are not modified by programmers, but the programmer must reserve space for them.
从2004年开始，用户应该开始避免使用这样的操作系统，即它们至少没有对缓冲区溢出提供某种自动保护机制。
Beginning in 2004, users should start avoiding any operating system that fails to provide at least some automatic protection against buffer overflows.
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