understand shared pool
保留一个文档Understanding Shared Pool Memory Structures - pap 。文档简要的解释了library cache object的以heap为基础的内存结构；详细的讲解了session_cached_cursor和cursor_space_for_time的作用。
还有juliandyke的Library Cache Internal,描绘出parent cursor和child cursor的关系，还有为什么child cursor不能够共享的原因也举了很多例子。
Eygle的shared pool interal 文章 也十分详细。
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very nice article~!
keep up hard work
好东西，收藏了