How did you code your MySQL solution? What storage type did you use? I bet this will perform great, and I'm pretty sure it's guaranteed atomic for MyISAM and InnoDB (would have to check to be sure):

  UPDATE table SET counter = counter + 1 WHERE counter_id = ?;

(Assuming you have an index on counter_id of course.)

You also need to look out for the usual DB-usage traps - make sure you're caching your connection between calls, tune your configuration to make appropriate use of memory, etc.

-sam

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