The example is a very active web site, the flow is this:
query for session information
process HTTP request
update session information
This happens for EVERY http request. Chances are that you won't have
concurrent requests for the same row, but you may have well over 100 HTTP
server processes/threads answering queries in your web server farm.
You're crazy :) Use memcache, not the DB :)
Chris
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TIP 6: explain analyze is your friend
