VACUUM only works on the main database. It is not possible to VACUUM an attached database file.
译文：VACUUM命令只能工作在主数据库上，不能用来“清扫”一个附加的数据库文件。
The main database configuration parameter settings that affect the query execution plan were set as follows
影响查询执行计划的主要数据库配置参数设置如下
Isomerization unit data connectivity components for the main database for retrieval and XML data generation.
数据连接组件主要进行异构数据库的读取和XML数据的生成。
To reconfigure the main database connection, click on the Reset configuration link on the Manage Servers page.
为了重新配置主数据库连接，在位于ManageServers页的Resetconfiguration链接上单击。
As most CIMS is running in network environment, distributed database is the main database technology in CIMS integration.
因为CIMS大多数是运行在网络环境之下，所以分布式数据库技术是实现CIMS集成的关键。
Due to the advantages in terms of maintenance and performance, we therefore encourage you to keep your lookups in the main database in this case.
基于维护和性能上的优点，因此在这种情况下我们鼓励您将查找保存在主数据库中。
China lacks a direct equivalent. The central bank's main database includes personal credit history data on less than a third of the country's population.
中国缺乏与之直接对应的东西。央行的主数据库里只有该国不到三分之一人口的个人信用记录。
On the other hand, if your lookup data USES a single form and if there are only hundreds of documents, then there is a negligible effect on your main database.
另一方面，如果查找数据使用单个表单，并且只有几百个文档，则对主数据库的影响几乎可以忽略不计。
According to demands of the system function, main database table (Standard database), total procedure table, contract table and other temporary tables were established.
依据系统功能实现要求，建立了主数据库表(标准库)、工序总表、台帐表和多种过渡表。
When the next sales rep goes to synchronize the update to the main database, a conflict occurs because the current state of the row is different from what the synchronization engine was expecting.
当下一个销售代表同步更新到主数据库中时，就会发生异常，因为当前行的状态和同步引擎期望的不同。
The main value of this database is to allow for checking the code base periodically for regression or the introduction of errors as development proceeds.
这个数据库的主要价值在于：在开发期间，允许定期检查代码库以查看代码是否退化或引入了错误。
In our experience, the main causes of throughput degradation are code issues, database issues, and test data or method issues.
根据我们的经验，导致吞吐量降低的主要原因是代码问题、数据库问题、以及测试数据或者方法问题。
As the name implies, an in-memory database resides entirely in main memory rather than on disk, making data access an order of magnitude faster than with conventional, disk-based databases.
顾名思义，内存中数据库完全驻留在主存中，而不是磁盘上，这使得数据访问比传统的基于磁盘的数据块要快一个数量级。
The main difference between an ODBC application and a CLI application is in the way the database driver is loaded.
ODBC应用程序与CLI应用程序之间主要的不同在于装载数据库驱动程序的方式。
When your module needs to access or store information in a database, the main part of Figure 1 that you are interested in is the application tables.
当您的模块需要在数据库中访问或存储信息时，在图1中，需要关注的主要部分是应用程序表。
The main purpose of entity EJB components is to remotely access persisted data, mostly stored in a relational database.
实体e JB组件的主要目的是远程访问持续数据，这些数据主要存储在关系数据库中。
The main layers of the application are a database, a persistence framework, a database access object, and user interface (UI) controller and view layers.
应用程序的主要层是数据库、持久性框架、数据库访问对象和用户界面(UI)控制器及视图层。
It is usually best to choose the main tool by considering the primary role of the database user and by taking advantage of its XML capabilities as far as possible.
最好是通过考虑数据库用户的主要角色，并通过考虑尽量长远地发挥其XML功能的优势，来选择主要工具。
The main advantage of the XML support in the relational database is that you can save both relational and XML data in the same table.
关系数据库中的XML支持的主要好处是，可以在同一个表中同时存储关系数据和XML数据。
As a database developer, you usually join the customer table to the contact table and treat the customer as the main table.
作为数据库开发人员，您通常将客户表与联系方式表连接，并将客户表视作主表。
For example, a blog post with its main article, comments, and votes on comments would be split into multiple tables in a relational database.
例如，在一个关系型数据库中，一篇博客(包含文章内容、评论、评论的投票)会被打散在多张数据表中。
Since a DB2 buffer pool is a part of the main memory of the system, the DB2 database manager allocates it for caching tables and index data when it reads or writes to and from media disks.
因为db2缓冲池是系统主内存的一部分，DB 2数据库管理器在它读取或写入磁盘介质时将它分配给缓存表和索引数据。
Site X's main feature is its huge database of torrents. All are organized by artist, so you can find everything someone has released in one place.
这个站点的主要特色是其强大的数据库搜索功能，所有的歌曲都以演唱者的名字来索引，网站上所收录的歌曲种类版本相当齐全。
When this happens, you should connect to the database and reduce the size of the main buffer pools.
这时，应该连接到数据库，并减少主缓冲池的大小。
The main purpose of the Database class is to encapsulate this string, as well as any username/password information that might be needed to make a connection.
Database类的主要目的就是封装这个字符串，还有建立连接操作时可能需要的任何用户名／密码信息。
As you learned in the previous section, executing a database query involves three main concepts.
如上一部分所述，执行数据库查询包括三个主要概念。
If users are allowed to search their archived mail, the fields CSLDOrigDB and main search criteria (like the Subject attribute) should also have a database index configured.
如果用户被允许搜索已归档的邮件，那么也应该为字段CSLDOrigDB和主要的搜索标准(如subject属性)配置数据库索引。
There are three main ways to update the Demo Index database with new documents.
可以通过以下三种主要方式，使用新文档更新DemoIndex数据库。
In the tree control in the left pane, select the database connection you've just created, and click the Run icon from the main tool bar.
在左侧面板中的树控件中，选择刚才创建的数据库连接，然后单击主工具栏中的Run图标。
InfoQ: What are the main differences in the areas of data modeling and application development when working on a NoSQL database compared to a Relational database?
InfoQ：NoSQL数据库与关系型数据库相比，在数据建模和应用开发上其最主要的差别是什么？
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