Publish/subscribe (user to data)

 

Sample publish/subscribe sites include search engines, media sites such as weather.com, and numerous newspapers and magazines, as well as event sites such as those for the Olympics and the Wimbledon championships.

Site content changes frequently, driving changes to page layouts. While search traffic is low in volume, the number of unique items sought is high, resulting in the largest number of page views of all site types. Security considerations are minor compared to other site types. Data volatility is low. This site type processes the fewest transactions and has little or no connection to legacy systems. See Table 2-1.

Workload pattern	Publish/subscribe
Categories/examples	Search engines Media Events
Content	Dynamic change of the layout of a page Many page authors; page layout changes frequently High volume, non-user-specific access Fairly static information sources
Security	Low
Percent secure pages	Low
Cross-session info	No
Searches Structured by category Totally dynamic Low volume
Unique Items	High
Data volatility	Low
Volume of transactions	Low
Legacy integration/ complexity	Low
Page views	High to very high

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