taking tablespace offline or online 使表空间离线或连线
alter tablespace tnname online 恢复完成后
You can perform online tablespace backups, and use these backups to restore a tablespace following media failure.
可以执行在线表空间备份，并且用这些备份来恢复由介质损坏的表空间。
When Alter Tablespace ts_name End backup is issued, again a checkpoint SCN is recorded at the headers of online backup data files.
当发出“Alter Tablespace ts_name End Backup”时，在联机备份数据文件的的文件头中再次记录了检查点scn。
Supports full, incremental, delta and tablespace level online / offline backup and recovery.
支持完全、增量、delta 和表空间级在线/离线备份和恢复。
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