COGNOS Business Intelligence Series 7

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Chapter 1: Enterprise Reporting Web Clients PowerPlay Web Explorer Web Server Windows Clients PowerPlay for Windows PowerPlay Web Viewer PowerPlay for Excel PowerPlay Enterprise Server Client applications run from the Web or in Windows. On the Web PowerPlay Web Explorer is a zero-footprint client, offering all essential OLAP analysis in HTML format. PowerPlay Web Viewer offers report consumers the ability to run published reports and view them in PDF format. PowerPlay Web Explorer and PowerPlay Web Viewer are related Web applications, collectively referred to as PowerPlay Web. In Windows PowerPlay for Windows offers advanced OLAP functionality for in-depth analysis and report authoring and viewing. PowerPlay for Excel offers full OLAP analysis and reporting to users who prefer to work with Microsoft Excel spreadsheets. The client applications connect to local cubes directly or to remote cubes on a server. Client (Local Cubes) Server (Remote Cubes) PowerPlay Web (using a Web browser) PowerPlay Enterprise Server PowerPlay for Windows PowerPlay for Excel Server Architecture PowerPlay Enterprise Server consists of three components that you can install separately: • The gateway component is, by default, a CGI (Common Gateway Interface) program that handles Web requests. Alternate gateways (p. 11) may also be used. The gateway must be located on all Web servers that receive PowerPlay requests. When a request is received, an instance of the gateway is created to handle the request. 10 Cognos PowerPlay (R)
Chapter 1: Enterprise Reporting • The dispatcher is a Windows service or a UNIX daemon that receives PowerPlay requests (either directly from a Windows client or from the gateway for a Web client) and manages the request queue. The dispatcher passes the requests to a query or report processor on the same computer, or forwards the request to another dispatcher on another computer. • The processors process requests and generate results for the client applications. The query processor handles cube requests from PowerPlay Web Explorer, PowerPlay for Windows, and PowerPlay for Excel. The report processor handles report requests from PowerPlay Web Viewer and printing requests from PowerPlay Web Explorer. Several instances of either processor may be started, limited only by available memory. The maximum number of processes can be set in the administration tool, PowerPlay Enterprise - Server Administration. PowerPlay Enterprise Server Windows client LAN Web client Gateway Dispatcher Processors Extranet/Intranet Alternate Gateways The PowerPlay Enterprise Server architecture adapts to your existing and expanding IT infrastructure in a mixed computing environment. You can install components on separate computers, or combine components on one or more computers. Most components have a Windows and UNIX equivalent, and you can combine these in any way. For example, you may have a data mart that consists of several UNIX computers on which you plan to store cubes, but a Web server that runs on Windows. If you install multiple dispatchers, you can also configure the system to allow each dispatcher to share the reports that are published to the portal. This allows users to locate their published reports regardless of the dispatcher they are routed to. For example, if you use a router to distribute Web requests to different gateways and different dispatchers, you can ensure that your users will always be able to locate their reports. This flexibility is almost limitless, but requires careful consideration in order to get optimum performance. For information about installing and configuring the various components of PowerPlay Enterprise Server, see the installation guide and the Planning Advanced Installations Guide. To improve Web server performance, you can configure Cognos Web products to use alternate gateways that replace the default CGI programs. The alternate gateways are native server extensions for ISAPI to support Microsoft Internet Information Server on Windows, for NSAPI to support Sun Java System Web servers on both Windows and UNIX, and for the Apache module. Enterprise Server Guide 11
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COGNOS Business Intelligence Series 7

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