How to limit MongoDB database size Are there any mechanisms to limit the size of a single database on MongoDB 2.6? I found some options like quota, quotaFiles and nssize but am unsure how to use them.
Ok, it was simple :)

I wanted to limit each database to 256MB of space per student. In order to achieve that, I enabled smallfiles in /etc/mongod.conf and ran the mongod process with mongod -f /etc/mongod.conf --quota --quotaFiles 4 which limited the size of the database to 256MB.

smallfiles starts preallocating space with 16MB, then 32MB, 64MB and finally 128MB. Add this up and you get 240MB plus 16MB file for the namespace = 256MB

This however doesn't stop them from creating another database with the same user. Any help on this?