I once wrote a tool to insert Apache logfiles into a SQLite database to run queries against.
I'm frequently surprised by how popular that project remains:
* http://steve.org.uk/Software/asqlback
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That reminds me, there's actually a funky old Microsoft skunkworks project that lets you query CSVs and Apache logfiles and all sorts of stuff via SQL: http://www.microsoft.com/en-us/download/details.aspx?id=2465 I have no idea if it even still runs on current windows versions.