All Database Management System

Software built to define, store, retrieve, query and administer structured data on behalf of other programs, filed as a system entity because a DBMS is a concrete named software product with a real release history and maintaining organization, the same test the computing atlas's other built-thing system entries already meet. Spans relational engines that organize data into tables under SQL (Oracle Database, MySQL, PostgreSQL, Microsoft SQL Server); document, key-value, wide-column and graph engines usually grouped under the NoSQL umbrella (MongoDB, Redis, Apache Cassandra, Neo4j); search and analytics engines built on similar storage and query machinery (Elasticsearch, ClickHouse); NewSQL engines that add horizontal scale-out to relational consistency guarantees (CockroachDB, Google Cloud Spanner); and embedded libraries linked directly into an application rather than run as a separate server process (SQLite, RocksDB). Does not belong here: a programming language's own standard library data structures (filed under concept or language), or a general-purpose operating system or network protocol that happens to store data as a side effect, filed under Operating System or Network and Internet Systems.