E-Trade Servers - PowerPoint PPT Presentation

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E-Trade Servers

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  1. E-Commerce Servers Internet, Web and Database server architectures for e-commerce

  2. Learning Outcomes In this session we will talk about • Server basics • Software for e-commerce servers • Utilities and maintenance software • Web server hardware architectures • Web site hosting alternatives

  3. Types of E-Commerce Web Sites To plan appropriately for an e-commerce server one must determine • what they want want to accomplish from a business perspective • identify the types of content that will be delivered • estimate how many visitors will be connecting to the Web site • select an appropriate hardware and software platform • select an appropriate service provider

  4. Server options • The job of a server computer is to respond to requests from client computers • Depending on the type and number of requests different options are appropriate • The three main components of a server that have to be decided upon: • Hardware platform (processor, storage, networking—price, maintenance costs) • Operating system • Web server software • Support for standards

  5. Purpose of e-commerce sites Companies create Web sites for very different reasons: • simple proof-of concept sites • Intranets (internal information) • information-only sites for customers • business-to-business portals and extranets • on-line stores (e-shops) • content-delivery sites

  6. Proof-of-concept Sites • To explore if some type of on-line activity is appropriate for the business, to experiment • The simplest Web site and the least costly to implement • A development site can reside on an existing PC and can be developed with low-cost Web site building tools, such as MS FrontPage or Macromedia Dreamweaver • Testers can access the site through their PCs on the existing LAN, possibly not accessible from the Internet

  7. Intranet • Corporate intranets hold internal memos, corporate policy handbooks, expense account worksheets, budgets, newsletters, and a variety of other corporate documents • Intranets are shielded from the Internet; they do not require additional security software to protect them against threats from outside the company

  8. Extranet • Extranets are intranets that allow certain authorized parties outside the company to access certain parts of the information stored in the system • More control than a freely available Internet site

  9. Transaction-Processing Sites • Transaction-processing sites: business-to-business and business-to-consumer electronic commerce sites • Highly available: 24 hours a day, seven days a week • Reliability: spare servers to handle high traffic volumes • Highly secure: must run security software to protect financial info

  10. Content-Delivery Sites • Content-delivery sites deliver content: • news, e-books, music, software or software components • text, MP3 files, PDF documents, executables • fixed or streaming (e.g. daily news or stock exchange live data) • Content must be delivered rapidly on the visitor’s screen • Visitors must be able to locate content quickly (this may be very hard)

  11. Open Standards • Two ways to interoperability • de-facto standards (MS Windows, Word Documents, Adobe PDF) • open standards (agreed on by consensus and can be used by all) • common property (Internet, Web) or for fee (Rosetta Net)

  12. Web Clients and Servers • Internet connections that are part of the Web become Web client computers on a worldwide client/server network • Client/server architectures are used in LANs, WANs, and the Web • Web software is platform neutral, letting computers communicate with each other easily

  13. An open system: the Web

  14. Dynamic Content • A core requirement of e-commerce sites • Dynamic content is information constructed on demand and in response to a Web client request • Server-side technologies are programs running on the Web server to create the Web pages before sending them back to the client • ASP, JSP, and PHP are server-side scripting mechanisms that build dynamic sites and Web applications

  15. Future Trends • Proliferation of different deliver channels (web, mobile, Digital TV, home appliances, in-car systems etc.) • Transcoding: common data, different presentation • Content is stored as XML with tags that describe the meaning of each content item • Server recognizes type of client and “transcodes” XML documents into appropriate format by (possibly) applying a style sheet to the data • Many frameworks: Apache Cocoon, IBM Websphere portal, Microsoft part of .NET and Oracle

  16. Server Architectures • Server – any computer used to provide files to other computers connected to it through a network • Server software • Server hardware • Patterns of server architectures (tested solutions to common problems)

  17. Two-Tier Client/Server Architecture

  18. Three-Tier and N-Tier Client/Server Architectures

  19. Operating Systems • The operating system organizes and controls the hardware of any computer • It is the first program run on a computer • It provides “abstract” services to user applications • Windows, Linux, Unix (Solaris, BSD, IBM etc), OS/390, VMS, Be, Mac OS, QNX, VxWorks, open source.

  20. Web Server Software October 3 dataset

  21. Secure Web Server Software January 2001 dataset SSL sites only

  22. Apache (apache.org) • Free and efficient • Runs on many operating systems and the hardware that supports them • Has a built-in search engine and HTML authoring tools and supports FTP • Can be managed from either a server console or a Web server • Many addons, e.g. XML, J2EE, ASP, PHP etc • Web services

  23. Microsoft IIS • Bundled with Microsoft Windows 2000 Server operating systems • Includes an integrated search engine • Permits administration from a remote server • Combines HTML, ActiveX components, and scripts to produce dynamic pages • Integrates with other MS products

  24. Sun ONE • A.k.a. iPlanet or Netscape Web Server • Runs on many operating systems, including HP-UX, Solaris, and Windows • Its management tools allow administrators to manage users and monitor server activity interactively • More appropriate for large entrprises

  25. Telnet and FTP • Used to update and maintain web sites. • Less popular nowadays due to web based management tools • Telnet allows users to log on to a computer that is connected to the Internet • FTP, File Transfer Protocol, is the part of the TCP/IP rules that defines the formats used to transfer files between TCP/IP computers. • Can transfer files one at a time, or several at once • Displays remote and local computers’ directories • Has built-in error controls to copy files accurately

  26. Indexing and Searching • Search engine and indexing programs are important elements of many Web servers • Search engines, or search tools, search either a specific site or the entire Web for requested documents • An indexing program can provide full-text indexing that generates an index for all documents stored on a server

  27. Data Analysis • Web servers can capture visitor information, including data about who is visiting a Web site, how long the visitor’s Web browser viewed the site, the date and time of each visit, and which pages were displayed • Two of the most popular Web log file analysis programs are the Analog Web server log file analyzer and the WebTrends Web server log file analyzer

  28. Link Checking • A link checker examines each page on the site and reports on any URLs that are broken, that seem to be broken, or that are in some way incorrect • An orphan file is a file on a Web site that is not linked to any page • Other important site management features include script checking and HTML validation • A dead link, when clicked, displays an error message rather than a Web page

  29. Link Checking

  30. Remote Server Administration • With remote server administration, a Web site administrator can control a Web site from any Internet-connected computer • Although all Web sites provide administrative controls, it is convenient for an administrator to be able to fix the server from wherever he or she happens to be

  31. RSA Tool

  32. Web Server Hardware • Web server computers have more memory, larger and faster hard disk drives, and faster processors than typical desktop or notebook PCs • A virtual server, or virtual host, is a feature that maintains more than one server on one machine

  33. Server Performance Evaluation • Benchmarking is a form of testing used to compare the performance of hardware and software • Hardware and operating systems are key areas for benchmarking • The speed of its connection can affect a Web server’s performance • Throughput and response time can be used to measure a server’s Web page delivery capability

  34. Web Server Solutions • Large sites deliver millions of pages every day • They process thousands of customer and vendor transactions each day • The large collection of servers that these sites have are called server farms • One approach: a few very large and very fast (and very expensive) computers • Alternative approach: a large number of relatively inexpensive servers • Large decentralized sites must use load-balancing systems

  35. Load-Balancing • A load-balancing switch is a piece of network hardware that monitors the workloads of the servers attached to it and assigns incoming Web traffic to the server that has the most available capacity • In a simple load-balancing system, the traffic that enters the site from the Internet, encounters the load-balancing switch, which then directs the traffic to the Web server best able to handle the traffic

  36. LBS Architecture

  37. Complex Load-Balancing

  38. Service Providers • When making Web server hosting decisions, a company should ask whether the hardware, or platform and software combination, can be upgraded when the traffic on its site increases • Using a service provider’s shared or dedicated hosting services instead of building an in-house server or using a co-location service means that the staffing burden shifts from the company to the Web host

  39. Summary How to choose • Server basics • Software for e-commerce servers • Utility and maintenance software • Web server hardware architectures • Web site hosting alternatives to match business needs