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Databases Written in C

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	3store Abandoned Project	2003	Triplestore / RDF	C	Abandoned Project
	4store Abandoned Project	2009	Triplestore / RDF	C	Abandoned Project
	AceDB Abandoned Project	1989	—	C	Abandoned Project
	Adaptive Server Enterprise Acquired Company	1987	Relational	C	Acquired Company
	Aerospike NoSQL AI-Assisted	2009	Document / XML, Key/Value, Vector	C	NoSQL AI-Assisted
	AGEDB Middleware AI-Assisted	2019	Graph	C	Middleware AI-Assisted
	AgensGraph Forked Code Multi-Model Acquired Company	2013	Document / XML, Graph, Key/Value, Relational	C	Forked Code Multi-Model Acquired Company
	AKDB	2009	Relational	C
AL	AlchemyDB Acquired Company Abandoned Project	2010	Relational	C	Acquired Company Abandoned Project
	Alenka Abandoned Project	2012	Relational	C	Abandoned Project
	Altibase OLTP	1999	Relational	C	OLTP
	Amelie OLTP	2023	Relational	C	OLTP
AN	AngstromDB Abandoned Project	2013	Key/Value	C	Abandoned Project
	AntDB Forked Code	—	Relational	C	Forked Code
AO	AODBM Abandoned Project	2011	—	C	Abandoned Project
	AresDB OLAP Abandoned Project	2018	Relational	C	OLAP Abandoned Project
	Aurora	2014	Relational	C
	BangDB Multi-Model NoSQL	2015	Key/Value	C	Multi-Model NoSQL
	Brytlyt OLAP Forked Code Acquired Company	2013	Relational	C	OLAP Forked Code Acquired Company
	Cachegrand Cache	2018	Key/Value	C	Cache
	Citus OLAP Acquired Company AI-Assisted	2010	Relational	C	OLAP Acquired Company AI-Assisted
	Cloudberry OLAP Forked Code Revival Project	2023	Relational	C	OLAP Forked Code Revival Project
	Clustrix NewSQL Acquired Company OLTP	2006	Relational	C	NewSQL Acquired Company OLTP
	Comdb2 AI-Assisted	2004	Relational	C	AI-Assisted
	Couchbase NoSQL	2010	Key/Value, Document / XML	C	NoSQL
	Cubrid AI-Assisted	2008	Relational	C	AI-Assisted
	Db2	1983	Document / XML, Relational	C
	dBASE xBase	1979	Relational	C	xBase
	DeviceSQL Streaming	1998	Relational	C	Streaming
DI	DIRECT OLTP	1978	Relational	C	OLTP
	DocumentDB Middleware NoSQL AI-Assisted	2023	Document / XML	C	Middleware NoSQL AI-Assisted
DQ	Dqlite	2017	Relational	C
	DynomiteDB Abandoned Project	2012	—	C	Abandoned Project
	EJDB	2012	Key/Value, Document / XML	C
EN	EnnoDB Abandoned Project	2012	Key/Value	C	Abandoned Project
	EuclidOLAP OLAP	2022	Array / Matrix	C	OLAP
	eXtremeDB Cache Time-Series OLTP Middleware	2001	Column Family / Wide-Column, Entity-Relationship, Key/Value, Relational	C	Cache Time-Series OLTP Middleware
	FairCom DB	1984	—	C
	FalkorDB AI-Assisted	2023	Graph	C	AI-Assisted
	FineDB Abandoned Project NoSQL	2013	Key/Value	C	Abandoned Project NoSQL
	Firebird AI-Assisted	2000	Relational	C	AI-Assisted
	FlashDB	2020	Key/Value	C
	FramerD	1996	Object-Oriented	C
	FrontBase	1993	Relational	C
GA	Gamma OLAP Abandoned Project OLTP	1986	Relational	C	OLAP Abandoned Project OLTP
	GDBM DBM	1990	Key/Value	C	DBM
	Gel OLAP AI-Assisted	2018	Relational	C	OLAP AI-Assisted
GN	GNU SQL Server	1997	Relational	C
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	C	OLAP Forked Code Acquired Company
	Groonga AI-Assisted	2009	—	C	AI-Assisted
	HampusDB	2006	Key/Value	C
	Hydra OLAP Abandoned Project Failed Company	2022	Relational	C	OLAP Abandoned Project Failed Company
	Illustra Acquired Company OLTP	1992	Relational	C	Acquired Company OLTP
	Ingres Acquired Company	1974	Relational	C	Acquired Company
	InterBase Acquired Company	1984	Relational	C	Acquired Company
	IonDB Abandoned Project	2015	Key/Value	C	Abandoned Project
	IQ Acquired Company	1992	Relational	C	Acquired Company
	ITTIA DB Time-Series OLTP	2000	Relational	C	Time-Series OLTP
	Kappa Abandoned Project	1989	Relational	C	Abandoned Project
KE	KekeDB	—	Relational	C
	Kerf	2014	—	C
	Kinetica OLAP	2009	Relational	C	OLAP
	KitaroDB	2012	Key/Value	C
	Kunlun Abandoned Project	2019	Relational	C	Abandoned Project
	LEAP	1997	Relational	C
	libSQL Forked Code OLTP	2022	Relational	C	Forked Code OLTP
	LMDB MMAP DBM AI-Assisted	2011	Key/Value	C	MMAP DBM AI-Assisted
	MariaDB AI-Assisted	2009	Relational	C	AI-Assisted
MC	mcdb Abandoned Project Immutable MMAP	2010	Key/Value	C	Abandoned Project Immutable MMAP
MD	MDBMS	1998	Relational	C
	Memcached Cache	2003	Key/Value	C	Cache
	Memgraph AI-Assisted	2016	Graph	C	AI-Assisted
	MetalBase Abandoned Project	—	Relational	C	Abandoned Project
	Mimer SQL	1974	Relational	C
	MonetDB OLAP MMAP	2002	Column Family / Wide-Column	C	OLAP MMAP
	Monotone	2023	—	C
	mSQL	1994	Relational	C
MU	MUFFIN	1979	Relational	C
	MySQL Acquired Company	1994	Relational	C	Acquired Company
	Neon Serverless Forked Code Acquired Company OLTP	2021	Relational	C	Serverless Forked Code Acquired Company OLTP
	nessDB Abandoned Project	2011	Key/Value	C	Abandoned Project
	Netezza OLAP Acquired Company	1999	Relational	C	OLAP Acquired Company
	NonStop SQL Acquired Company OLTP	1987	Relational	C	Acquired Company OLTP
	Numstore Query Engine	2026	Array / Matrix	C	Query Engine
	ObjectBox Time-Series Nearest Neighbor Search MMAP Mobile NoSQL	2016	Object-Oriented	C	Time-Series Nearest Neighbor Search MMAP Mobile NoSQL
	OlegDB MMAP NoSQL	2014	Key/Value	C	MMAP NoSQL
	OpenEdge OLTP	1984	Relational	C	OLTP
OP	open-gpdb OLAP Forked Code	2024	Relational	C	OLAP Forked Code
	Oracle RDBMS	1977	Key/Value, Graph, Triplestore / RDF, Document / XML, Relational	C
	OrioleDB Acquired Company AI-Assisted	2021	Relational	C	Acquired Company AI-Assisted
	ParAccel OLAP Acquired Company	2006	Relational	C	OLAP Acquired Company
PE	PearlDB Abandoned Project	2015	Key/Value	C	Abandoned Project
	PieCloudDB OLAP	2021	Relational	C	OLAP
	Pincaster	2010	Document / XML	C
	PipelineDB Acquired Company Abandoned Project Streaming	2013	Relational	C	Acquired Company Abandoned Project Streaming
	pocketSQL Abandoned Project	2001	Relational	C	Abandoned Project
	Pogocache Cache	2025	Key/Value	C	Cache
	PostgreSQL OLTP	1986	Relational	C	OLTP
	RayforceDB OLAP AI-Assisted	2023	Relational	C	OLAP AI-Assisted
	Redict Cache Forked Code NoSQL	2024	Key/Value	C	Cache Forked Code NoSQL
	Redis Cache OLTP AI-Assisted	2009	Key/Value	C	Cache OLTP AI-Assisted
	RedisGraph	2018	Graph	C
	Redshift OLAP Serverless	2012	Relational	C	OLAP Serverless
	RedStore Abandoned Project	2009	Triplestore / RDF	C	Abandoned Project
	RocksDB Forked Code OLTP	2012	Key/Value	C	Forked Code OLTP
	ScaleOut StateServer	2005	Key/Value	C
SD	SDB	—	Document / XML, Relational	C
	Serenity Abandoned Project NoSQL	2015	—	C	Abandoned Project NoSQL
SH	Shore-MT Forked Code OLTP	2007	Object-Oriented	C	Forked Code OLTP
	SiriDB Time-Series	2016	—	C	Time-Series
	solidDB Acquired Company OLTP	1992	Relational	C	Acquired Company OLTP
SP	Sparkey Abandoned Project Immutable	2013	Key/Value	C	Abandoned Project Immutable
	Speedy Abandoned Project	—	Relational	C	Abandoned Project
	SplinterDB NoSQL	2018	Key/Value	C	NoSQL
	SQLflex	—	Relational	C
	SQLite OLTP	2000	Relational	C	OLTP
	Tarantool	2008	Key/Value	C
	TDengine Time-Series AI-Assisted	2017	Relational	C	Time-Series AI-Assisted
	Tibero OLTP	2003	Relational	C	OLTP
	TidesDB OLTP	2024	Column Family / Wide-Column	C	OLTP
	TinyDB Query Engine Peer-to-Peer	1999	Relational	C	Query Engine Peer-to-Peer
	Tokyo Cabinet	2006	Key/Value	C
	TrailDB Abandoned Project	2014	Relational	C	Abandoned Project
	Truviso Acquired Company Streaming	2006	Relational	C	Acquired Company Streaming
TY	Typhoon Abandoned Project	1996	Relational	C	Abandoned Project
	UnQLite OLTP NoSQL	—	Document / XML, Key/Value	C	OLTP NoSQL
	upscaledb OLAP Abandoned Project	2007	Key/Value	C	OLAP Abandoned Project
	Valkey Cache Forked Code NoSQL AI-Assisted	2024	Key/Value	C	Cache Forked Code NoSQL AI-Assisted
	Vedis Abandoned Project	2014	Key/Value	C	Abandoned Project
	VertexDB Abandoned Project	2009	Graph	C	Abandoned Project
	Virtuoso	1998	Relational	C
	WarehousePG Forked Code AI-Assisted	2025	Relational	C	Forked Code AI-Assisted
	WebScaleSQL Forked Code Abandoned Project	2014	Relational	C	Forked Code Abandoned Project
	WhiteDB Abandoned Project	2008	Network	C	Abandoned Project
	WiredTiger Acquired Company AI-Assisted	2008	Key/Value	C	Acquired Company AI-Assisted
	Yellowbrick OLAP	2014	Relational	C	OLAP
	YottaDB NoSQL	2001	Key/Value	C	NoSQL
	Zu Cache	2025	Key/Value	C	Cache