第三部分对于查询调优是至关重要的，因为它提供了大量有用的信息，例如查询所用的数据访问方法和连接方法。
The third part is of vital importance in query tuning, because it provides us with a great deal of useful information, such as the data access method and the join method that the query used.
TAI接受了终端用户身份，并创建了ltpa令牌之后，WebSphere Portal依靠LDAP执行额外的查询，例如查询组信息。
After the TAI has accepted the end user identification and created an LTPA Token, WebSphere Portal performs additional queries against LDAP, such as group information.
例如，查询可以限定只返回一个且只有一个结果，或者只返回前20个查询结果。
For example, a query can be constrained to return one and only one result, or only the first 20 selected results.
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