PostgreSQL 14 Internals Book
Postgrespro's blog ( <a href="https://habr.com/en/company/postgrespro/blog/" rel="nofollow">https://habr.com/en/company/postgrespro/blog/</a> ) and <a href="http://www.interdb.jp/pg/index.html" rel="nofollow">http://www.interdb.jp/pg/index.html</a> are incredible resources to learn about Postgres internals in depth.<p>Are there resources of similar quality available for MySQL / MariaDB internals ?