接下来，为应用程序创建并指定一个镜像数据库。
Next we create and specify a mirror database for our application.
为了设置镜像数据库，必须在源系统上执行以下动作。
Here are the actions required on the source system to set up the mirror database.
镜像数据库是实施改进同步请求吞吐量能力的操作所必需的。
The mirror database is required for staging operations to improve the throughput capacity of synchronization requests.
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