title: Sorting an LMDB file for sequential access according to key order
body: <p>I have LMDB files (about 20GB usually but may be larger) with several thousand Key-Value pairs each. The keys have not been inserted in their lexicographic order and I would like to know if there is a simple command to reorder an LMDB file according to the lexicographic order of the keys so that it translates to a sequential read access if data is read in that very order.</p>
  
  <p>Thanks a lot!</p>