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I would recommend "Architecture of a Database System" by Joe Hellerstein, Micheal Stonebraker, and James Hamilton [0] as a start if you want formal perspective without getting too much into theory.

[0] http://db.cs.berkeley.edu/papers/fntdb07-architecture.pdf

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As a sidenote, Michael Stonebreaker himself is nowdays building VoltDb which is a memory-db that he thinks is much more evolved than relational systems. I havn't used it but it looks interesting. I did try OrigoDb which is an open source .NET based memory db and it worked great for my needs and the queries are really fast.

(I work at VoltDB)

VoltDB is easy to try. There is a free 30-day trial available on voltdb.com, and a docker-based demo (http://voltdb.com/voltdb-demo).

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