Web-based front-end to MySQL's EXPLAIN

If you are troubleshooting slow MySQL queries and are confused with the tabular output of the EXPLAIN command, you may wish to check out my little MySQL EXPLAINer service. You upload a CSV file with whatever output EXPLAIN SELECT has given you, and the query execution plan are is presented in form of a tree.

The CGI script is actually just a web front-end to the nice command-line tool mk-visual-explain, which does all the hard work of parsing EXPLAIN output. All due credit goes to the developers of Maatkit - read their documentation and slides referenced from their site if you are really interested in the technical details.