横向扩展通常用于应用服务器层。
Horizontal scaling is typically employed for the application server tier.
这可能是托管了与应用程序或遗留系统集成的适配器的应用服务器层。
This might be an application server layer hosting adaptors integrated with application or legacy systems.
谁被选举为活动服务器，将把应用服务器层发来的内容群发到其它服务器上。
Whoever is voted active becomes the active in an election process, and then evreything that is sent to him via the appserver tier he sends to the other guys multicast.
可伸缩性和新客户的介入取决于配置应用服务器资源，以及所担保的基础架构栈和应用程序层基础架构的复制。
Scalability and new-customer on-boarding depends on provisioning application server resources as well as the guaranteed replication of infrastructure stacks and application-layer infrastructure.
这种变化导致应用服务器无法继续承担表现层的巨大负荷。
As a result, the application servers are not burdened anymore with the task of the presentation layer.
应用服务器是应用程序和基础架构层多租户的关键部件，因为多租户会影响安装、配置和应用程序代码。
The application server is a critical component in multi-tenancy at the application and infrastructure layer, because multi-tenancy affects installation, configuration, and application code.
这是因为应用服务器(即arfm管理的资源层)并没有过载。
This is because the application server, which is the resource tier that ARFM manages, is not overloaded.
CSCF负责端点的SIP注册，并处理服务层中恰当应用服务器的SIP信号消息传递。
CSCF handles SIP registration of the end points and process SIP signal messaging of the appropriate application server in the service layer.
应用服务器不仅负责承载和执行服务，而且还要使用SIP协议提供针对控制层的接口。
The application servers are not only responsible for hosting and executing the services, but also provide the interface against the control layers using the SIP protocol.
程序员应该将这一信息存储在Web应用服务器的会话层或者cookie中。
Instead, your programmers should store this information in the session layer of your Web application server or in a cookie.
这一层通常运行于ApacheTomcat或其他开源应用服务器之上。
This will most often be running on Apache Tomcat or some other open-source application server.
再下面一层是配置memcached实例的地方 — 即应用服务器与数据库服务器之间。
The next layer is where I configure my memcached instances — between the application servers and the database servers.
按照传统的做法，希望提高性能的网站会将静态文件移动到Web服务器层，以减少应用服务器上的负载。
Traditionally, sites looking for better performance would move static files to the Web server tier to reduce load on the application server.
前一节中的示例有三层，即前端Web服务器、应用服务器和数据库。
The example from the previous section has three tiers, which are the front-end Web server, the application server, and the database.
应用服务器的好处之一就是会自动在系统层间和应用程序间发送用户标识信息。
One of the great benefits of an application server is that user identity information is automatically sent between system layers and across applications.
应用服务器环境的工作方式与排队网络很相似，一定要仔细地管理队列的大小，确保一层不会对另一层施加过大的压力。
The application server environment operates much like a queuing network, and it is important to manage the size of the queues so that one tier isn't overwhelmed by another.
这使得管理员可以在虚拟层，而不用在机器物理层，部署和迁移应用服务器。
This lets administrators deploy and move application servers at a virtualization layer level instead of at the physical machine level.
如果你发现中间层正在变成瓶颈，你就必须增加应用服务器的数量，数据层也是同样的状况。
If you see that the middle tier is becoming the bottleneck, you may have to add more no. of application servers and same is the case with the data tier.
接下来让我们看一个常见的三层应用程序环境示例：Web、应用服务器和数据库服务器。
Let's use an example of a common three-tier application environment: Web, application server, and database server.
受管的连接意味着应用服务器控制管理着(三层模型)的生命周期。
Managed connection means that the application server manages the lifecycle of the connection (3-tier model).
N级结构中的应用服务器负责提供可远程访问的业务逻辑组件，而表现层网页服务器则使用本网协议通过网络访问这些组件。
The application servers in n-tier architecture host remotely accessible business components. These are accessed by the presentation layer web server over the network using native protocols.
此方法要求前端中间件层包含WebSphereApplicationServerV6.0或更高版本，或者其他能够支持J2EE 1.4应用程序的J2EE应用服务器。
This approach requires the front-end middleware tier to contain WebSphere application server V6.0 or later, or another J2EE application server capable of supporting J2EE 1.4 applications.
通过在多个Web服务器和应用服务器之间实现自动故障转移，3层架构可以提高Web应用程序的可用性。
The 3-tier architecture can increase Web application availability by implementing automatic failover among multiple Web and application servers.
系统采用SQLSERVER数据库作为数据层的服务器，应用服务器使用数据库连接池和SQL语句来与SQLSERVER交互。
The system use SQLSERVER database as data-layer, Application server use database-connect-pool and SQL language to communicate with SQLSERVER database.
系统采用SQLSERVER数据库作为数据层的服务器，应用服务器使用数据库连接池和SQL语句来与SQLSERVER交互。
The system use SQLSERVER database as data-layer, Application server use database-connect-pool and SQL language to communicate with SQLSERVER database.
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