因此，根据经验法则，您可以考虑将页面清洗器的数目设置为数据库服务器上CPU的数目。

Hence, as a rule of thumb, you may consider setting the number of page cleaners equal to the number of CPUs on the database server.

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XML的限制与此法则在服务器或数据库端是一致的，管理人员在策略方面是保守的。

The strictures of XML are compatible with this law on the server or database side, where managers can impose conservatism as a matter of policy.

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但是不同的搜索引擎具有不同的数据库、查询界面和查询法则。

But different search engine has different database, different search interface and different rules for searching.

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