对于32位内存结构，不管系统有多少物理ram，在任何平台上任何进程的可寻址内存都是4gb。
With the 32-bit memory structure, regardless of how much physical RAM you may have on the system, the addressable memory by any process on any platform is 4gb.
对于32位内存结构，不管物理ram有多大，实例、数据库配置都受到4gb可寻址空间的限制。
With 32-bit memory structure, no matter how big the physical RAM is, the instance, database configurations are limited by the 4gb addressable space.
除了寻址信息之外，嵌入式消息描述符(MsgDesc)也作为消息数据的一部分存储在MQXQH结构内。
Besides the addressing information, an embedded message descriptor (MsgDesc) is stored within the MQXQH structure as part of the message data.
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