在第8行中，当最终执行查询以获得结果列表时，携带的类型信息展示了其优势。

In line 8, the type information that is carried throughout shows its advantage when the query is finally executed to get a list of results.

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索引可以减少DBMS在执行查询时检查的行(或元组)数量，从而获得性能增益。

Performance benefits are realized when an index reduces the number of rows (or tuples) examined by the DBMS during query execution.

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清单1包括一行复杂的代码，该行执行查询并对结果执行PortableRemoteObject . narrow 。

Listing 1 includes a complicated line performing the lookup and a PortableRemoteObject.narrow on the result.

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