在数据库处于循环日志记录模式时，单个表空间的备份不受支持。
Backing up individual table Spaces is not supported while the database is in circular logging mode.
表常常根据它们的功能关系和访问模式分组在表空间中。
Usually tables are grouped in a table space based on their function relation and access pattern.
通过执行命令“Alter Tablespace ts_name Begin Backup”，将任何或所有联机表空间置于联机备份模式来启动联机备份。
Online backup occurs either when any or all online table spaces are put into online backup mode by issuing a command Alter Tablespace ts_name Begin Backup.
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