我们的核心生产数据库通常都是在归档模式下运行的，更不用说还配置DG环境的了。开启归档，并保证所有归档不丢失，就能保证我们对
这里进行了3次归档当前日志文件的操作，目的是使online日志被刷新，强制其归档，写到归档日志中去，因为我们要测试的是归档，否则恢复文件时，会自动去online日志中查找，即便是非归档模式，只要online日志还未被刷新，，依旧是可以恢复的
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