DB-TUTORIAL
Mainstream database knowledge that backend programmers should master
...It introduces distributed consistency and consensus concepts through topics such as Paxos, Raft, Gossip, transactions, locks, sharding, and load balancing. Relational database sections cover SQL fundamentals and systems including MySQL, PostgreSQL, H2, and SQLite. Additional chapters examine MongoDB, Redis, HBase, Elasticsearch, and the wider Elastic stack. The repository also discusses middleware such as ShardingSphere and Flyway. Detailed indexes, operational guides, interview reviews, recommended books, papers, courses, and online ebook pages make it useful for both structured study and reference.