Database Series

Database Notes is an open-source educational knowledge base covering database theory, storage architectures, and modern data management technologies. It explains how databases store, retrieve, organize, and process information across different workloads. The material explores relational databases such as MySQL and PostgreSQL alongside key-value, document, graph, time-series, and vector databases. It examines indexing, transactions, consistency, availability, and scalability in database systems. Readers can study distributed databases, NewSQL architectures, and consensus mechanisms such as Paxos and Raft. The repository also introduces search engines, data warehouses, OLAP, and big data platforms. Its organized technical notes help developers and architects understand database internals and select appropriate storage technologies.