使用异步副本是一个备选方案，这可以避免同步副本带来的某些性能开销，但是这不能保证与主分区始终同步。

Using asynchronous replicas is an alternative that avoids some of the performance overhead of synchronous replicas, but they are not guaranteed to be identical to the primary at all times.

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而以其原生的表示使用XML数据，我们可以保证没有数据丢失而且性能最优。

By working with XML data in its native representation, we can be sure no data is lost and the performance is optimal.

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性能工程可以保证应用系统按照性能要求来架构、设计、构建以及测试，它是软件开发中的一条重要规范。

Performance Engineering is an important software development discipline that ensures that applications are architect-ed, designed, built and tested for performance.

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