伪列是具有预先定义的名称的标识符，其中包含关于分级查询的信息；它的用途类似于表中的任何列。
A pseudo column is an identifier with a predefined name that holds information about the hierarchical query and that can be used like any column in a table.
该查询实例返回了标识符为988的进程的线程数值。
This example query returns the value of thread count for the process with an identifier of 988.
Results—包含查询、搜索范围标识符和结果列表。
Results a "contains the query, the searched scope identifier, and the results list."
因此，应为所有这些可能的输入很好地定义XML查询语言中的每个运算符。
Therefore, each operator in an XML query language must be well defined for all these possible inputs.
这些标识符的使用和定义方式特定于您自己的安装，但是对这些标识符在这个已命名查询中的使用方式的理解应该告知您的命名策略。
How these identifiers are used and defined is specific to your own installation, but an understanding of how these are used in this named query should inform your naming strategy.
保证查询具有正确的标识符，而且这个设置的事实使用属性是有效的。
Ensure that the query has appropriate identifier and fact usage attributes set for this setting to be effective.
针对LDAP数据的一项特殊修改是考虑将'('和')'作为查询词边界指示符。
One particular modification for the LDAP data is to consider '(' and') 'as word boundary indicators.
图4展示了一个在联邦服务器使用嵌套循环连接操作符来计算这个查询的计划。
Figure 4 shows a plan using the nested loop join operations at the federated server to evaluate this query.
其余的两个区域提供了关于访问计划的每个操作符以及查询所使用的表和/或索引的细节。
The remaining two sections provide details on each operator of the access plan, and the tables and/or indexes used by the query.
了解创建子类型实体和使用它们的三种服务(添加、更新和按标识符查询)的步骤，同时考虑性能因素。
Step through the creation of subtyped entities and three service types that may consume them (add, update, and inquiry by identifier) with performance considerations in mind.
此后这个作业的标识符可以用于查询该作业软件分发的状态。
The job identifier can be used later for polling the software distribution status of the job.
回忆我使用CMP 的时候，查询位于XML部署描述符中的这一事实致使此因素无任何意义。
Thinking back to my CMP days, the fact that the query was in the XML deployment descriptor made this factor insignificant.
要使用表子查询，需要使用SQL操作符将嵌入式查询与布尔表达式组合在一起。
To use a table subquery, you need to use an SQL operator to combine the embedded query with a Boolean expression.
要获取所有级别上的所有下属，必须将PRIOR运算符添加到分级查询子句的CONNECTBY部分。
To get all subordinates over all levels, the PRIOR operator must be added to the CONNECT BY part of the hierarchical query clause.
这些操作符会被嵌套在括号中并与其他的查询语言操作符混合在一起吗？
Can these operators be nested in parenthesis and mixed with the other query language operators?
另外，DB 2可以利用新的查询和联结操作符以及新的索引处理技术，为涉及XML文档的查询提供更好的运行时性能。
In addition, DB2 can leverage new query and join operators, as well as new index processing techniques, to provide strong runtime performance for queries involving XML documents.
就我们此处的目的而言，只要理解异步是通过优化器明智地放置TQ(表队列)操作符而引入到联邦查询计划之中的就足够了。
For our purposes, it suffices to understand that asynchrony is introduced into a federated query plan by the optimizer's judicious placement of the TQ (Table Queue) operator.
将操作符类与访问方法结合使用，可以指定创建索引和优化查询时使用的操作符。
An operator class is used in conjunction with the access method to specify the operators used for building the index and during query optimization.
注意：当索引表达式被用于关系表达式，或作为某个操作符类函数的参数时，查询优化器将考虑使用函数索引。
Note: the query optimizer considers using a functional index when the index expression is used in a relational expression or as an argument to one of the operator class functions.
清单1显示了如果利用布尔操作符进行查询的过程。
Listing 1 shows the process of doing searches with Boolean operators.
在某些环境下，优化器不能将一个ATQ 放在一个SHIP操作符之上，因为这样会改变查询的语义。
Under certain circumstances,it is not possible for the optimizer to place an ATQ above a SHIP operator because doing so changes the semantics of the query.
比较图4和图5中的访问计划，会发现对于EISCAN操作符，查询使用了一个扩展索引。
Comparing the access plans in Figure 4 and Figure 5 shows again with the EISCAN operator that an extended index is used by the query.
对于SELECT查询，远程sql语句中的文本可以在查询执行计划中与SHIP操作符相关的细节中找到。
For SELECT queries, the text of the remote SQL statement can be found in the details associated with the SHIP operator in the query execution plan.
在这些情况下，SHIP操作符将保持同步，以维持查询的语义。
In these cases, the SHIP operator will remain synchronous in order to maintain the semantics of the query.
RETURN操作符将完成查询执行，并将查型结果返回到API。
The return operator completes the query execution and returns the query result to the API.
请参阅SPARQL的规范，详细学习SPARQL的内置函数、操作符、查询格式和语法，或者参阅更多SPARQL查询示例。
Look at the SPARQL spec to learn in detail about SPARQL's built-in functions, operators, query forms, and syntax, or to see many more example SPARQL queries.
总而言之，短小的查询和OLTP事务就像含参数占位符的预置语句一样，具有更快的速度。
In a nutshell, short queries and OLTP transactions are faster as prepared statements with parameter markers.
包含远程语句的SHIP操作符表明要远程处理查询中的一部分。
Recall that a SHIP operator containing a remote statement indicates a portion of the query that is to be processed remotely.
插件本身需要用查询返回的惟一标识符来处理XML文档。
The unique identifiers returned by the query are needed by the plug-in itself for processing the different XML documents.
插件本身需要用查询返回的惟一标识符来处理XML文档。
The unique identifiers returned by the query are needed by the plug-in itself for processing the different XML documents.
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