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No, BDB JE does not add padding. I don't know what the MongoDB optimization is about, but I assume from your description it is to allow overwriting a record on disk when it is updated and its size has grown. This doesn't apply to BDB JE, since it always appends data to the end of a file -- it never overwrites. It uses a no-overwrite, append-only log structured storage system. This is described in the documentation.