已知当前应用程序的数据库层结构非常良好和高效。

The database tier of current applications is known to be very well structured and efficient.

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首先，确保发生任何非功能性的变化之前，已经存在已知的、良好的、签署过的功能基线。

First, it ensures that you have a baseline of known-good, signed-off functionality before making any non-functional changes.

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事实上，具有已知的、得到良好理解的性能特征的稳定应用程序是执行WebSphere Virtual Enterprise部署的最佳候选。

In fact, stable applications with known and well understood performance characteristics are the best candidates for a WebSphere Virtual Enterprise deployment.

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