#MySQL

A deep systems architecture guide to database durability and crash recovery: how the ARIES protocol guarantees ACID atomicity and durability using Write-Ahead Logging (WAL), Steal/No-Force buffer management, Log Sequence Numbers (LSNs), and three-phase recovery with Compensation Log Records (CLRs).

A deep architectural comparison of PostgreSQL and MySQL: MVCC vacuuming vs. undo logs, JSONB GIN indexes vs. functional indexes, BRIN vs. B+Tree, and high-concurrency locking strategies.

A masterclass on executing database schema changes on multi-million row tables in Laravel without locking tables, dropping queries, or causing application downtime.