how can i record the web server log files and replay the the recorded server logs so that i can latter run the logs and check the load on sql server.
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What's wrong with using a tool? Tools like selenium will exercise the front-end, you can probably setup a server and a collection of clients running on separate machines to simulate user interaction.
If you want to exercise the backend more directly you could write a unit test I suppose, but unit testing isn't really designed for doing that sort of thing.