Learn databases from the bottom up by coding your own, in small steps, and with simple Go code (language agnostic). Atomicity & durability. A DB is more than files! Persist data with fsync. Crash recovery. KV store based on B-tree. Disk-based data structures. Space management with a free list. Relational DB on top of KV. Learn how tables and indexes are related to B-trees. SQL-like query language; parser & interpreter. Concurrent transactions with copy-on-write data structures.