#1 - you might find it's not just the per field overhead, but the per document one. Check out the powerOf2Sizes settings; http://docs.mongodb.org/manual/refere

#1 - you might find it's not just the per field overhead, but the per document one. Check out the powerOf2Sizes settings; http://docs.mongodb.org/manual/reference/command/collMod/#usePowerOf2Sizes http://docs.mongodb.org/manual/reference/command/collMod/#us... 10gen have been thinking about compression but nothing specific has happened yet (https://jira.mongodb.org/browse/SERVER-164 https://jira.mongodb.org/browse/SERVER-164). ZFS + compression is interesting, but not 'production' quality if you're using linux, and last time I tried to get MongoDB running on Solaris I gave up...