Application Server

Server that provides a range of services to run the R/3 System. An application server provides the following services: D: Dialog V: Update E: SAP lock administration (enqueue) B: Background processing S: Print formatting (spool) G: SAP gateway An application server consists of a dispatcher and one or more work processes for each service. The dispatcher manages processing requests, and work processes execute them. Each application server provides at least one dialog service and one gateway. It may also provide further services. Only one application server can offer the SAP lock administration service.

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分隔线上面是 SAP 标准文档中提供的说明
分隔线下面是我的翻译
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提供一系列服务,运行 R/3 系统的服务器。应用服务器提供下列服务:D,会话;V,更新;E,SAP 锁管理(队列);B,后台处理;S,打印格式化(假脱机);G,SAP 网关,一个包含了一个分配器和给每个服务分配一个或多个工作进程的应用服务器。分配器管理处理请求,让工作进程来执行它们。每个应用服务器提供至少一个会话服务和一个网关。它还可以提供更多的服务。只有一个应用服务器可以提供 SAP 锁管理服务。

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