Freely available on UC Berkeley’s CS website and various GitHub paper repos.

Understanding Database Internals: A Curated Roadmap and GitHub Resources

: MemTables flush to disk as Sorted String Tables (SSTables).

: B+ Trees keep data sorted and balanced, allowing search times.

The GitHub community has built incredible roadmaps for anyone wanting to move beyond "using" a database to "building" one.

," breaking down complex topics like B-Trees and distributed transactions into digestible summaries Readings in Databases (db-readings)