Next we create and specify a mirror database for our application.

接下来，为应用程序创建并指定一个镜像数据库。

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Mount the split mirror copy of the database directory.

装配数据库目录的分割镜像拷贝。

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The database configuration parameter LOGRETAIN must be set to RECOVERY prior to splitting the mirror if it is intended to be initialized as standby or mirror database.

如果打算将镜像初始化为备用数据库或镜像数据库，那么在分割镜像之前，必须将数据库配置参数LOGRETAIN设置为RECOVERY。

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