On Fri, May 23, 2014 at 08:52:19AM -0700, Dinesh Vadhia wrote: > Got a mdb_map_full error twice on a 64-bit Python 2.7 environment with a > map_size=2gb. Using the guidance of 8+key+value, the populating data should > have comfortably fitted around 1.7gb. Best solution is to increase the > map_size but wondered if I'm missing something? Hey Dinesh, Actual environment size depends a lot on the access pattern used to build the database. I am a little fuzzy on why this is the case, but it's common in B-tree implementations. Expect as much as 50% difference between your data size and the resulting database size. You may notice after fully building your database, that running "python -m lmdb rewrite -e source.lmdb -E dest.lmdb" produces a much smaller database, since "rewrite" writes everything sequentally. David