Best Opportunities for Building a Web Application with SimpleDB as Data Source?
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Apart from Amazon's core PHP library for SimpleDB, there are two others that I am aware of.
Paws is a special SimpleDB library and
Tarzan which supports many of Amazon's web services and seems to be well documented.
One thing to be aware of is that any single SimpleDB query may not be as fast as a regular database call, but most of the time you can run your calls in parallel.
If you can run your web application on Amazon EC2 (either yourself, or if you can find a hosting company using EC2), you will see much lower latency in SimpleDB requests than you would get from a PHP host outside of the Amazon cloud. When running on EC2 I usually get roundabouts from 2-7ms to SimpleDB (not including request processing time).
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