Simon Willison’s Weblog

"MongoDB is fantastic for logging". Sounds tempting... high performance inserts, JSON structured records and capped collections if you only want to keep the past X entries. If you care about older historic data but still want to preserve space you could run periodic jobs to roll up log entries in to summarised records. It shouldn’t be too hard to write a command-line script that hooks in to Apache’s logging directive and writes records to MongoDB.