Oracle实例的启动过程
Oracle实例启动过程和对文件的操作，当System Checkpoint SCN=Datafile Checkpoint SCN=Start SCN的时候，Oracle数据库是可以正常
Oracle实例启动过程和对文件的操作
初始化实例
然后将数据库mount
然后载打开数据库
初始化实例 startup nomount
首先oracle回去找pfile，spfile来初始化实例，分配sga，后台进程，跟踪日志
然后alter database mount
首先启动实例，并打开控制文件，利用控制文件中的参数将实例和数据库联系起来，再检测数据库日志文件是否存在等操作
然后alter database open
打开各种数据文件
由SMON系统监视器(System Monitor)进程按照控制文件中记录的SCN信息进行核对各种文件的信息
当System Checkpoint SCN=Datafile Checkpoint SCN=Start SCN的时候，Oracle数据库是可以正常启动的，而不需要做任何的media recovery。而如果三者当中有一个不同的话，则需要做media recovery
***********************************************
注意：关于SCN查看关于SCN
相关阅读：
Oracle实例和服务知识点
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