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The Multidimensional Model & OLAP (IV)

The Multidimensional Model & OLAP (IV). Developed by: Dr Eddie Ip Modified by : Dr Arif Ansari. Outline. Demo : Websites powered by BI tools http://www.nasdaq.com (powered by Impromptu) http://www.informationbuilders.com/applications/powered_bywf.html (powered by WebFocus)

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The Multidimensional Model & OLAP (IV)

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  1. The Multidimensional Model & OLAP (IV) Developed by: Dr Eddie Ip Modified by : Dr Arif Ansari

  2. Outline • Demo : Websites powered by BI tools • http://www.nasdaq.com (powered by Impromptu) http://www.informationbuilders.com/applications/powered_bywf.html (powered by WebFocus) • Basic Web Terms & Concepts • Illustration by WebFocus

  3. Web-based Data Access • Convergence of web and DW/BI technology • Facilitated by open environment : SQL , ODBC • Thin client based (e.g. Web browser) applications • Robust architecture to support thin client computing

  4. Basic Terms & Concepts • Thin client : client/server model where computing burden is on server • CGI-based programs used to access databases from the Web and display thro’ browser • e.g. Oracle’s Web Application Server (the in-between tier in a 3-tier structure)

  5. Thin Client • CGI programs manages all phases in sequence • huge overhead for CGI (client not sharing load) • Application Programming Interface (API) from Web servers (e.g. NSAPI from Netscape,ISAPI from MS) reduces CGI overhead

  6. Thin Client • Thin client has limited presentation capabilities (tradeoff- speed & security) • Java or ActiveX programs (applets) downloaded “just-in-time” (sandbox idea) • Demo: • http:www-rcf.usc.edu/~mvmwt • Provide interactive capability on client side • Better security than plug-ins

  7. middleware Web client API , CGI Application server Html, javascript java ODBC (window) JDBC (java) DB Server SQL

  8. DB Queries • Queries : content rich, IT-oriented • Reports : format rich, business-oriented • Static versus Interactive

  9. DB Queries • Underlying technology of information retrieval : SQL and OLAP • Example of Web-based reporting tool: WebFocus • Alternative: Build Web-interface. E.g. nasdaq.com, driven by Impromptu

  10. Features of reporting tools • SQL-based & OLAP-based • Friendly user interface • Format rich • Often web-enabled • Interactive reporting : get most current results from database

  11. Summary • Web-based Data Access • Data Base Queries • Features of reporting tools

  12. Glossary • CGI: Common Gateway Interface • API : Application programming interface • ODBC: Open Database Connectivity • JDBC: Java Database Connectivity • SQL : Structured query language • OLAP: Online Analytical Processing

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