Howard Chu @ SymasSo yes it's true that LMDB doesn't have any explicit operation to reclaim dead space - that's because it doesn't need it. It also tracks all freed pages and reuses them as soon as it's safe to do so, so while "the file can only grow" in reality it only grows as fast as you add data to the DB, and will automatically reuse space whenever you delete data from the DB.
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