Databases with Custom Storage Model · Database of Databases


	ActorDB Abandoned	2014	Relational	Custom	Abandoned
	AllegroGraph	2004	Triplestore / RDF	Custom
	ArangoDB Multi-Model AI-Assisted	2011	Document / XML, Graph, Key/Value	Custom	Multi-Model AI-Assisted
	Azure SQL Database Hosting Service	2009	Relational	N-ary Storage Model (Row/Record)	Hosting Service
BB	bbolt Forked Code Revival Project	2017	Key/Value	Custom	Forked Code Revival Project
	BBoxDB AI-Assisted	2015	Array / Matrix	Custom	AI-Assisted
	Berkeley DB Acquired Company OLTP DBM	1994	Document / XML, Key/Value	Custom	Acquired Company OLTP DBM
	BigchainDB Abandoned Blockchain	2015	Document / XML, Key/Value	N-ary Storage Model (Row/Record), Custom	Abandoned Blockchain
	BoJack Abandoned	2016	Key/Value	Custom	Abandoned
	BoltDB Abandoned	2013	Key/Value	Custom	Abandoned
	Cloudant Acquired Company OLTP NoSQL	2008	Document / XML	Custom	Acquired Company OLTP NoSQL
	Cloud BigTable	2005	Column Family / Wide-Column	Custom
	Cloud Spanner NewSQL	2007	—	Custom	NewSQL
	CockroachDB NewSQL OLTP AI-Assisted	2014	Relational	Custom	NewSQL OLTP AI-Assisted
	Compass Abandoned Search Engine	2006	Document / XML, Object-Oriented	Custom	Abandoned Search Engine
	Couchbase NoSQL	2010	Key/Value, Document / XML	Custom	NoSQL
	CouchDB NoSQL	2005	Document / XML	Custom	NoSQL
	Datomic Acquired Company	2012	Key/Value	Custom	Acquired Company
	DGraph Acquired Company AI-Assisted	2015	Graph	Custom	Acquired Company AI-Assisted
	Elasticsearch Search Engine NoSQL AI-Assisted	2004	Document / XML	Custom	Search Engine NoSQL AI-Assisted
	EsgynDB Failed Company	2015	Relational	N-ary Storage Model (Row/Record), Custom, Decomposition Storage Model (Columnar), Hybrid	Failed Company
	Express Acquired Company	1970	Array / Matrix	Custom	Acquired Company
	FalkorDB AI-Assisted	2023	Graph	Custom	AI-Assisted
	FeatureBase Abandoned Search Engine	2017	Relational	Custom, Decomposition Storage Model (Columnar)	Abandoned Search Engine
	FineDB Abandoned NoSQL	2013	Key/Value	Custom	Abandoned NoSQL
	FoundationDB Acquired Company OLTP AI-Assisted	2009	Key/Value	Custom	Acquired Company OLTP AI-Assisted
	GrapheekDB Abandoned	2014	Key/Value, Graph	Custom	Abandoned
	GrapheneDB Hosting Service	2012	Graph	Custom	Hosting Service
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	Custom, Decomposition Storage Model (Columnar), N-ary Storage Model (Row/Record)	OLAP Forked Code Acquired Company
	Hazelcast Cache	2008	Key/Value	Custom	Cache
	Heroic Abandoned	2015	Key/Value	N-ary Storage Model (Row/Record), Custom	Abandoned
	Hive OLAP AI-Assisted	2010	Relational	Hybrid, Custom, Decomposition Storage Model (Columnar), N-ary Storage Model (Row/Record)	OLAP AI-Assisted
	HStreamDB Streaming	2020	Relational	Custom	Streaming
	HyperDex Abandoned NoSQL	2011	Key/Value	Custom	Abandoned NoSQL
	HyperGraphDB	2007	Graph	Custom
	Hypertable Acquired Company Abandoned	2008	Column Family / Wide-Column	Custom	Acquired Company Abandoned
	Impala OLAP AI-Assisted	2013	Relational	Custom	OLAP AI-Assisted
	JaguarDB Nearest Neighbor	2017	Array / Matrix, Key/Value	Custom	Nearest Neighbor
	JanusGraph Acquired Company	2012	Graph	Custom	Acquired Company
	KVdb NoSQL	2018	Key/Value	Custom	NoSQL
LI	libmdbx Forked Code MMAP	2015	Key/Value	Custom	Forked Code MMAP
	LMDB MMAP DBM AI-Assisted	2011	Key/Value	Custom	MMAP DBM AI-Assisted
	Materialize Streaming AI-Assisted	2019	Relational	Custom	Streaming AI-Assisted
	Memcached Cache	2003	Key/Value	Custom	Cache
	Memgraph AI-Assisted	2016	Graph	Custom	AI-Assisted
	MongoDB NoSQL AI-Assisted	2009	Document / XML	Custom	NoSQL AI-Assisted
	Nebula Graph	2018	Graph	Custom
	Neo4j NoSQL AI-Assisted	2007	Graph	Custom	NoSQL AI-Assisted
	Neptune	2018	Graph, Triplestore / RDF	Custom
	NuoDB NewSQL Acquired Company	2010	Relational	Custom	NewSQL Acquired Company
	NutsDB AI-Assisted	2018	Key/Value	Custom	AI-Assisted
	ObjectBox Time-Series Nearest Neighbor MMAP Mobile NoSQL	2016	Object-Oriented	Custom	Time-Series Nearest Neighbor MMAP Mobile NoSQL
	OnceDB Cache Abandoned Failed Company	2016	Document / XML	Custom	Cache Abandoned Failed Company
OP	open-gpdb OLAP Forked Code	2024	Relational	Decomposition Storage Model (Columnar), N-ary Storage Model (Row/Record)	OLAP Forked Code
	OpenSearch Forked Code Search Engine AI-Assisted	2021	Document / XML	Custom	Forked Code Search Engine AI-Assisted
	OrbitDB Peer-to-Peer	2015	Document / XML, Key/Value	Custom	Peer-to-Peer
	Pilosa Abandoned	2017	Vector	Custom	Abandoned
	RavenDB MMAP NoSQL AI-Assisted	2009	Document / XML, Key/Value	Custom	MMAP NoSQL AI-Assisted
	Redis Cache OLTP AI-Assisted	2009	Key/Value	Custom	Cache OLTP AI-Assisted
	RedisGraph	2018	Graph	Custom
	RocksDB Forked Code OLTP	2012	Key/Value	Custom	Forked Code OLTP
	SequoiaDB	2011	Document / XML	Custom
	SimpleDB NoSQL	2007	Key/Value	Custom	NoSQL
	Sparksee	2006	Graph, Object-Oriented	Custom
	Speedb Forked Code Acquired Company	2020	Key/Value	Custom	Forked Code Acquired Company
	SQL Server	1988	Relational	N-ary Storage Model (Row/Record), Custom
	Sqrrl Acquired Company NoSQL	2012	Graph, Key/Value	Custom	Acquired Company NoSQL
	SurrealDB Serverless Multi-Model AI-Assisted	2016	Document / XML, Graph, Relational	Custom	Serverless Multi-Model AI-Assisted
	Tarantool	2008	Key/Value	Custom
	TerarkDB Forked Code Acquired Company	2016	Key/Value	Custom	Forked Code Acquired Company
	TerminusDB AI-Assisted	2019	Document / XML, Graph, Triplestore / RDF	Custom	AI-Assisted
	TiDB NewSQL AI-Assisted	2015	Key/Value	Custom	NewSQL AI-Assisted
	TieredMemDB Cache Forked Code Abandoned NoSQL	2020	Key/Value	N-ary Storage Model (Row/Record)	Cache Forked Code Abandoned NoSQL
	TiKV AI-Assisted	2016	Key/Value	Custom	AI-Assisted
	TinyDB	2013	Document / XML	Custom
	TuGraph	2021	Graph	Custom
	Vald Nearest Neighbor Search Engine AI-Assisted	2019	Vector	Custom	Nearest Neighbor Search Engine AI-Assisted
	Valkey Cache Forked Code NoSQL AI-Assisted	2024	Key/Value	N-ary Storage Model (Row/Record)	Cache Forked Code NoSQL AI-Assisted
VA	Valthree Cache NoSQL	2025	Key/Value	Custom	Cache NoSQL
	WarehousePG Forked Code AI-Assisted	2025	Relational	Decomposition Storage Model (Columnar), N-ary Storage Model (Row/Record)	Forked Code AI-Assisted
	XAP	2000	Key/Value	Custom
	YugabyteDB Forked Code OLTP AI-Assisted	2016	Key/Value, Relational	Custom	Forked Code OLTP AI-Assisted
	zeeSQL Cache OLTP	2021	Relational	Custom	Cache OLTP