Oracle数据库启动步骤
Shutdown=>No mount=> Mount=> Open
MOUNT：
1. 将一个数据库与一个已启动的实例关联起来
Associating a database with a previous started instance
2. 定位并打开所有在参数文件中指定的控制文件
Locating and opening all of the control files specified in the parameter file
3. 读取控制文件以获取数据文件和在线重做日志文件的名字与状态(但是，文件的存在性并没有被检查)
To perform. specific maintenance operations, start an instance and mount a database, but do not open the database.
For example, the database must be mounted but must not be opened during the following tasks:
1. Renaming data files(Data files for an offline tablespace can be renamed when the database is open).
2. Enabling and disabling online redo log file archiving operations.
3. Perform. full database recovery
OPEN:
1. Opening the data files
2. Opening the online redo log files.
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/8520577/viewspace-764764/ ，如需转载，请注明出处，否则将追究法律责任。
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