Helicopter views and tartans

"Can we have more helicopter views?" asked a client from whom we're running a series of courses - by which they mean overviews that put all the elements of the technologies in place on a diagram - showing how tomcat relates to MySQL and how JBoss and Struts and EJBs fit in to the picture. For sure you can, and I note the term "Helicopter views" to add to my dictionary of metaphors.

"Do you have any Scots in the group?" I ask my class, as I use another Metaphor to explain how MySQL's select command restricts the returned values to just a tiny subset of the data available. If you have a tartan where 20% of the warp threads are green, and where 20% of the weft threads are green, then your cloth has only 4% of its area being full green - green on green. Translate that into a Select command; if you choose just a fifth of the columns in a table, and you then use a where clause where just 20% of the rows are selected, your result set, efficiently, is just 4% of the data held.

(written 2006-04-06 18:36:12)

Associated topics are indexed under

A099 - Java Application - Deployment on the Web
A100 - Web Application Deployment - The Components of a Web-Based Solution
S157 - More MySQL Commands

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Sympathetic development
Melksham, Wiltshire
Adding PHP tags to an old cgi program
Wiltshire to get an extra MP
Helicopter views and tartans
Keeping your regular expressions simple
Both ends of the animal
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The best Open Source library in town
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