Start an instance without mounting a database. Typically, you do this only during
database creation or while performing maintenance on the database. Use the STARTUP
command with the NOMOUNT clause. In this example, because the server parameter file
is stored in the default location, you are not required to specify the PFILE clause:
STARTUP NOMOUNT
At this point, the SGA is created and background processes are started in preparation
for the creation of a new database. The database itself does not yet exist.
第六步 : 不装载数据库 , 启动实例
在这个步骤中 , SGA和后台进程被启动
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