Hi,

What books can I read to help me implement a relational+SQL database
system? E.g. writing a SQL parser, planner, and executor; how to
achieve atomic transactions, recovery strategy, how to do WAL, etc.?

The only books I've read that's closest to this are "Distributed
Databases: Principles and Systems", by Ceri/Pelagati; and of course
Gray's "Transaction Processing: Concepts and Techniques", but they
only cover transaction and transaction recovery.

I also intend to read some source code, e.g. PostgreSQL and Firebird.
:-)

--
Pascal