1. 1 ACCTG 6910 Building Enterprise & Business Intelligence Systems (e.bis) Dimensional Modeling V Olivia R. Liu Sheng, Ph.D. Emma Eccles Jones Presidential Chair of Business

2. 2 www.acctg6910.edu Analyzing Web Log (ClickStream) Data Index.html chart.html info.html Web Site Client A 128.196.23.212 Client B 128.192.51.16 t1 t3 t5 t2 t4 t6 t7 Hyperlink Client A visits Client B visits 128.196.23.212, t1, “GET /index.html”, … 128.192.51.16, t2, “GET /index.html”, … 128.196.23.212, t3, “GET /info.html”, … 128.192.51.16, t4, “GET /info.html”, … 128.196.23.212, t5, “GET /chart.html”, … 128.192.51.16, t6, “GET /index.html”, … 128.192.51.16, t7, “GET /chart.html”, … Web Access Log tn – nth timestamp

3. 3 www.acctg6910.edu Server Web Log (ClickStream) Data Index.html chart.html info.html Web Site Client A 128.196.23.212 Client B 128.192.51.16 t1 t3 t6 t2 t4 t5 t7 Hyperlink Client A visits Client B visits 128.196.23.212, t1, “GET /index.html”, … 128.192.51.16, t2, “GET /index.html”, … 128.196.23.212, t3, “GET /info.html”, … 128.192.51.16, t4, “GET /info.html”, … 128.196.23.212, t5, “GET /chart.html”, … 128.192.51.16, t6, “GET /index.html”, … 128.192.51.16, t7, “GET /chart.html”, … Web Access Log tn – nth timestamp

4. 4 Web Log Data Attributes 128.196.23.212 – u0012343 [29/Jan/2002:13:55:36 -0700] “GET /index.html HTTP/1.0” 200 5716 ValueExplanation 128.196.23.212IP address - Client machine id (unavailable) u0012343User id [29/Jan/2002:13:55:36 - 0700] Timestamp GETHTTP method /index.htmlPath of requested object HTTP/1.0Protocol 200Status code (200 = OK) 5716Size of requested object

5. 5 Web Log Data Attributes ValueExplanation "http://www.acctg6910.edu/index.ht ml" Referer "Mozilla/4.08 [en] (Win98; I; Nav)" User agent (information about client browser) 128.196.23.212 - u0012343 [29/Jan/2002:13:55:36 -0700] "GET /index.html HTTP/1.0“ 200 5716 "http://e.bis.business.utah.edu/links.html" "Mozilla/4.08 [en] (Win98; I; Nav)" 128.196.23.212 - u0012343 [29/Jan/2002:13:56:07 -0700] "GET /info.html HTTP/1.0“ 200 3756 "http://www.acctg6910.edu/index.html" "Mozilla/4.08 [en] (Win98; I; Nav)"

6. 6 Page_KeyPageURLPage Type 1www.acctg6910.edu/Index.htmlPortal 2www.acctg6910.edu/info.htmlClass information 3www.actg6910.edu/chart.htmlChart 128.196.23.212, t1, “GET /index.html”, … 128.192.51.16, t2, “GET /index.html”, … 128.196.23.212, t3, “GET /info.html”, … 128.192.51.16, t4, “GET /info.html”, … 128.196.23.212, t5, “GET /chart.html”, … 128.192.51.16, t6, “GET /index.html”, … 128.192.51.16, t7, “GET /chart.html”, … Session_KeySession_IDIP 11000001 128.196.23.212 21000002 128.192.51.16 Login_Time_KeyLogin_Time…… 1t1…… 2t2…… Session_KeyPage_KeyLogin_Time_KeyNum_Access 1111 1211 1311 2122 2221 2321 Visualizing Web Log Data mart

7. 7 Web Log Data Attributes 128.196.23.212 – u0012343 [29/Jan/2002:13:55:36 -0700] “GET /index.html HTTP/1.0” 200 5716 ValueExplanation 128.196.23.212IP address - Client machine id (unavailable) u0012343User id [29/Jan/2002:13:55:36 - 0700] Timestamp GETHTTP method /index.htmlPath of requested object HTTP/1.0Protocol 200Status code (200 = OK) 5716Size of requested object

8. 8 Web Log Data Attributes ValueExplanation "http://www.acctg6910.edu/index.ht ml" Referer "Mozilla/4.08 [en] (Win98; I; Nav)" User agent (information about client browser) 128.196.23.212 - u0012343 [29/Jan/2002:13:55:36 -0700] "GET /index.html HTTP/1.0“ 200 5716 "http://e.bis.business.utah.edu/links.html" "Mozilla/4.08 [en] (Win98; I; Nav)" 128.196.23.212 - u0012343 [29/Jan/2002:13:56:07 -0700] "GET /info.html HTTP/1.0“ 200 3756 "http://www.acctg6910.edu/index.html" "Mozilla/4.08 [en] (Win98; I; Nav)"

9. 9 Conformed Dimensions Most conformed dimensions are identical Readings: Chap. 3

10. 10 Degenerate Key: ORDER_NO Degenerate key provides additional grouping of fact records