This is a very long and very good blog series that I highly recommend. (One note, it's from 2013.) The funniest part is this post, which complains about code d

This is a very long and very good blog series that I highly recommend. (One note, it's from 2013.) The funniest part is this post, which complains about code duplication: https://ayende.com/blog/162853/reviewing-lightning-memory-mapped-database-library-a-thoughtful-hiatus https://ayende.com/blog/162853/reviewing-lightning-memory-ma... In the last two screenshots, there is a subtle difference with the indentation, which breaks MDB_PREV_DUP. It wasn't noticed until over a year later: https://github.com/LMDB/lmdb/commit/bfe297da47beb31debee48f016222b63d94271fd https://github.com/LMDB/lmdb/commit/bfe297da47beb31debee48f0... I'm still a big fan of LMDB. It's been hugely inspirational for me, and I think it's the best low-level key-value store out there. There is still lots of room for improvement though!