执行操作查询时使用“无光标”选项，因此不需要游标。
No cursor option is used when an action query is performed, and thus no cursor is necessary.
系统提供了互操作查询语言IOQL来实现多数据源上的查询。
It provides IOQL (Interoperable Object Query Language) which enables users to manipulate data in multiple databases.
它可以实现分布式子系统之间表单数据的交互，并且实现了位置透明，提供了异构数据兼容和历史操作查询等功能。
The middle software can complete such functions as table data communication, location transparency, heterogeneous data compatibility and history operate query.
不能下推的函数和操作会大大影响查询的性能。
Functions and operations that cannot be pushed down can greatly impact query performance.
然而，HTTPGET必须在一个查找或查询操作进行多重复用。
HTTP GET, however, must be multiplexed to a find or query operation.
它提供了CRUD操作和一种查询语言。
只有在连接器能够将组合查询作为单一操作执行时，才应该应用组合查询。
Combined queries should only apply if your connector can execute the combined query as a single operation.
图2显示了元数据浏览器用于查询操作的界面。
Figure 2 shows the metadata browser for the query operation.
如果有很多数据修改操作，而查询较少，那么应该将注意力放在好的写性能上。
If you have very frequent data modification operations and less queries, you should focus on good write performance.
存储过程是在数据服务器上创建和运行的，用于封装一组经常要运行的操作或查询。
They are created and run on the data server and used to encapsulate a set of frequently run operations or queries.
本文介绍了其中的两个操作：通过查询从服务器读取数据以及向服务器中添加新记录。
This paper covers two operations: reading data from the server through queries and adding new records to the server.
如前所述，对于复杂的查询操作，我们使用了直接JDBC调用，从而避免EJB 2查询中的性能开销。
As stated earlier, we used direct JDBC calls for our complex query operations to avoid the performance overhead in EJB2 query.
你可以自由的进行精确的CRUD操作、执行查询和规范等。
You get sophisticated CRUD operations, execution of queries as well as specifications for free.
允许操作下推的主要挑战是确保无论在何处执行操作，取得的查询结果总是相同的。
The major challenge of allowing an operation to be pushed down is to ensure that the same query result can be achieved regardless of where the operation is performed.
查询操作的参数是JPQL字符串或预定义名称查询的别名。
The arguments for a query operation are the JPQL string or moniker of a predefined named query.
元数据浏览器只显示用户可以对其执行查询操作的Salesforce对象。
The metadata browser shows only the Salesforce objects on which users can perform query operations.
本文涵盖了使用Clojure执行基本CouchDB操作，通过视图查询以及数据库复制。
This article covers the use of Clojure for performing basic CouchDB operations, querying CouchDB using views, and database replication.
删除无用的连接操作之后的查询。
联邦查询要从异步中获益，下推到远程数据源并在远程数据源上异步执行的操作(查询)必须有以下特征。
For a federated query to benefit from asynchrony the operations (queries) pushed down and executed asynchronously on the remote data source (s) must have the following properties.
清单11显示了如何用create操作完成该动态查询。
包含连接、分组、聚集和排序操作的决策支持查询。
Decision-support queries that involve joins, groups, aggregates and sort operations.
演示可以对远程数据执行的操作和查询。
Demonstrates operations and queries that can be performed on remote data.
DB 2允许存储、查询、操作和发布。
这些操作使用如下5个查询实现。
These operations were implemented in the five queries as follows.
为得到比较可靠的结果，我们多次执行导入操作和查询，对测量到的时间取平均值。
To achieve some reliable results, we executed the import operation and queries several times and averaged the measured times. The spatial operations are the following.
哪些数据库操作(查询，更新，复杂的连接)在性能和资源的消耗(cups，网络，内存，存储空间)方面是最大的开销。
Which database operations (queries, changes, complex joins) are most costs in terms of performance and required resources (cpus, network, memory, storage)?
这些操作能分享共有的事务，但是在查询和DML操作的执行顺序上有一些严格的规则。
These operations could share a common transaction, but there are strict rules about the order in which queries and DML operations are performed.
查找或查询操作还可以通过修饰后应用一个查询计划来自定义从数据库查询得到的实体集。
A find or query operation can be decorated to apply a fetch plan to customize the set of entities to fetch from the database.
所有操作—从查询数据库到创建或更改数据库中的数据—都通过一个基于REST的API执行。
All actions, from querying the database to creating or changing data in it, are performed via a REST-based API.
数据联合模式的有些实现可以将部分或全部子操作(子查询)以并行方式发送到集成源系统。
Some implementations of the data federation pattern are capable of sending some or all of the sub-operations (sub-queries) in parallel to the integrated source systems.
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