Oracle在专用与共享的模式下SGA和PGA的区别
在专用模式下，PGA下放置的是stack space，user session data，cursor state。 在共享模式下，PGA下只放stack space。而user ser
在专用模式下，PGA下放置的是stack space，user session data，cursor state。
在共享模式下，PGA下只放stack space。而user serssion data和cursor state则移到SGA下，所以在这种模式下，SGA需要更大的空间。为解决这个问题，所以引入large_pool_size ，，用于存放user session data，cursor state。
注：large_pool_size常用的两个功能
1. 就是在共享模式下，存储user session data，cursor state。
2. 在使用RMAN的时候。
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