This is somewhat of a duplicate of this MongoDB question ...
Auto compact the deleted space in mongodb?
See that answer for details on how to ...
- Reclame some space
- Use serverside JS
to run a recurring job to get back
space (including a script you can run ...)
- How you might want to look
into Capped Collections for some use
cases!
Also you can see this related blog posting: http://learnmongo.com/posts/compacting-mongodb-data-files/
