指定范围可以提高诸如搜索之类的性能。

Specifying the scope can improve the performance of such searches.

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本文的范围是数据库设计性能。

The scope of this article is database design performance.

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企业通常都会作这样设置，主要基于以下两点原因：控制用户的更新源，通过限制搜索范围提高性能。

An enterprise typically disables this preference for two reasons: to control the source of updates for their users or to improve performance by limiting the search scope.

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