准备工作，创建一个app1表空间。在archivelog mode下进行一冷备和对app1_01.dbf空间进行热备
第一种情况：Complete Recovery of a Closed Database
Closed database reocvery is used for :
1. System tablespace datafiles
2. Rollback segment datafiles
3. Whole database
Steps: shut down the instance -----> Restore dtafile -----> Apply archvied log and redo log files -------> Open the databse