查询的用户常常要等上数分钟甚至数小时，这取决于为了产生用户所请求的结果集，需要对多少数据进行搜索。
Query users can often wait for minutes or even hours, depending upon how much data must be searched in order to produce the result set requested by the user.
数据目录实现了用户搜索数据集所必须的功能。
Data catalogs fulfill a much-needed capability for the user to search for datasets.
静态搜索集是一种抽象数据类型，包含的操作包括initialize、insert和retrieve。
Static search set is an abstract data type with the operations initialize, insert, and retrieve.
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