Single-user database applications are very rare, so it is important to look at the performance behavior of a concurrent workload.
单用户数据库应用程序非常少见，因此考察并发工作负载的性能行为十分重要。
Assume that you have a single enterprise application (EAR) file that requires a database to store user data, and you have already created the schema file to populate the database.
假设您有一个企业应用程序(EAR)文件，该文件需要一个数据库来存储用户数据，您已经创建了一个架构文件来填充数据库。
For example, all application requests in Figure 1 are being routed to the database server through a connection established by a single application user, APP_USER.
例如，图1中的所有应用程序请求都通过一个应用程序用户APP_USER建立的连接传播到数据库服务器。
As a Database Administrator, you can use a new single-user mode that is an intermediary mode between quiescent mode and online mode.
数据库管理员可以使用新增的单用户模式，这是介于静止模式和联机模式之间的一种模式。
The new administration mode enhances and replaces single-user mode as a way to temporarily restrict access to the database server to perform administrative tasks.
新的管理模式增强并取代了单用户模式，它可以临时限制对数据库服务器的访问，以执行管理任务。
Specifically, if everything is happening in a single thread, performing long operations such as network access or database queries on the UI thread will block the whole user interface.
特别是，如果把所有的事件都放在主线程中来处理，需要长时间来处理的事件比如网络访问或者数据库查询，会阻塞整个UI。
This may be a corporate LDAP server or it may be a database that is only used by a single application, but the repository of user and group information is external to the J2EE environment.
这可以是企业LDAP服务器，也可以是仅由单个应用程序使用的数据库，但用户和组信息的存储库位于J2EE环境之外。
The file name is the name of a user database as described for the single organization provider as shown in section 4.2.1.
filename是4.2.1节讨论过的单一组织提供者的用户数据库文件名。
Administering the database server in single-user mode.
在单用户模式下管理数据库服务器。
This UserBean represents either a single row returned from the Derby database or no rows, depending on whether the user name entered in the form matches a user name in the database.
该UserBean表示从Derby数据库返回单行或者不返回任何行，这取决于在表单中输入的用户名是否与数据库中的用户名相匹配。
At the end of this part of the series, you will have built the database, a PHP module for the core bank logic, and a single-page based browser user interface, which are all part of our bank scenario.
到本文结束时，我们会建立数据库、一个提供核心银行逻辑的PHP模块以及一个单页面浏览器用户界面，这些都是银行场景的组成部分。
Of course, having a single authentication user ID in the database is not enough.
当然，在数据库中只有一个用户ID是不够的。
Oracle allows the middle tier to set up a number of lightweight user sessions within a single database connection, each of which uniquely identifies a connected user.
Oracle允许中间层在单个数据库连接中设置许多轻量级用户会话，每个会话都惟一地对应于一个连接用户。
User errors are estimated to be the greatest single cause of database downtime.
用户错误估计是数据库宕机的最大的单一原因。
For example, you could have a single named user access ten different DB2 database servers in your environment if those servers were licensed with the named or registered user model.
例如，您可以让一个指定用户访问在您环境中的10个不同的DB 2数据库服务器，前提是这些服务器是按照指定用户或注册用户模型颁发许可的。
Instead, you are using the XML tree as a small, in memory, single user hierarchical database.
相反，您将xml树用作内存中的小型单用户层次结构数据库。
In a single-threaded application, a user may spend idle time waiting for the calculations or database updates to finish.
在单一执行绪应用程式中，使用者可能需要花费閒置时间等待计算或资料库更新完成。
Since everything happens on a single thread performing long operations, like network access or database queries, on this thread will block the whole user interface.
一旦所有的事件都在一个线程中进行耗时的操作，比如说在这个线程上进行网络连接，数据库访问，会阻塞程序的界面响应。
Since everything happens on a single thread performing long operations, like network access or database queries, on this thread will block the whole user interface.
一旦所有的事件都在一个线程中进行耗时的操作，比如说在这个线程上进行网络连接，数据库访问，会阻塞程序的界面响应。
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