`

Instance and Databases

 
阅读更多

 

实例和数据库的关系,其实真正的世界也有相似的关系。一个实例可以被认为是一座通往数据库的桥,而数据

 

库可以被认为是一个岛。数据的进出都是通过这座桥。如果桥是不通,那么数据就不可能同数据库流出或写入

 

。在Oracle中,如果实例是开启的,数据可以写入数据库,也可以从数据库中读取数据。物理数据库的状态是

 

不会变化。如果实例关闭,用户不能访问数据库,即使它仍然存在身体。数据库是静态的。当实例重新开启,数

 

据将在那里等待它。

 


 
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