A database administrator can bring any tablespace other than the SYSTEM tablespace
online (accessible) or offline (not accessible) whenever the database is open. The
SYSTEM tablespace is always online when the database is open because the data
dictionary must always be available to Oracle.
A tablespace is usually online so that the data contained within it is available to
database users. However, the database administrator can take a tablespace offline for
maintenance or backup and recovery purposes.
联机脱机表空间
1. SYSTEM表空间总是online的 ， 因为Oracle需要使用数据字典
2. 脱机表空间可以用来进行备份或者恢复的操作
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10599713/viewspace-975631/ ，如需转载，请注明出处，否则将追究法律责任。
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