在部署完active data guard后，不但可以将只读的查询交给备库执行，还可以把日常的数据库备份工作放在备库上执行，从而减轻主库的
在部署完active data guard后，不但可以将只读的查询交给备库执行，还可以把日常的数据库备份工作放在备库上执行，从而减轻主库的压力，充分的发挥服务器资源，下面演示下利用备库备份来还原主库数据的过程！
一：主库上创建表空间，并在表空间上建表，插入测试数据，，同时检查备库的同步情况
二：在备库上使用rman对新建的表空间test01进行备份
三：关闭主库后删除表空间数据文件，模拟数据丢失场景
四：重新启动主库，只能启动到mount状态
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