Despite their origins within a PL/SQL program unit, these SQL statements use a shared area to hold their parsed representations and a private area for each session that runs the statement.

• 尽管这些SQL语句包含于程序结构内，她们依然使用自己的共享区存储解析结果，每个执行此语句的会话也将拥有一个与此语句相关的私有区。