The second level consists of the performance counter, which is an attribute of the performance object.

第二级包括性能计数器，它是性能对象的属性。

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To improve performance of this query, an index for the piid attribute has been added as shown in Listing 14.

要改进这个查询的性能，请为piid属性添加索引，参见清单14。

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Adding like-attribute blocks is a straightforward extension of the current technique and is unlikely to appreciably affect compression or performance.

添加类属性的块是对当前技术的简单扩展，不太可能对压缩或性能有较大的影响。

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