Databases with Two-Phase Locking (Deadlock Detection) Conc...


	Adaptive Server Enterprise Acquired Company	1987	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection), Two-Phase Locking (Deadlock Prevention)	Acquired Company
	AlloyDB OLAP Forked Code OLTP	2022	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	OLAP Forked Code OLTP
	ArangoDB Multi-Model AI-Assisted	2011	Document / XML, Graph, Key-Value	Two-Phase Locking (Deadlock Detection)	Multi-Model AI-Assisted
	AsterixDB OLAP AI-Assisted	2009	Document / XML	Two-Phase Locking (Deadlock Detection), Two-Phase Locking (Deadlock Prevention)	OLAP AI-Assisted
	Bedrock Blockchain OLTP AI-Assisted	2016	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Prevention), Two-Phase Locking (Deadlock Detection)	Blockchain OLTP AI-Assisted
	ClearDB Acquired Company	2010	Relational	Two-Phase Locking (Deadlock Detection)	Acquired Company
	CovenantSQL Abandoned Blockchain	2018	Relational	Two-Phase Locking (Deadlock Prevention), Two-Phase Locking (Deadlock Detection)	Abandoned Blockchain
	C-Store Abandoned	2005	Relational	Two-Phase Locking (Deadlock Detection)	Abandoned
	DBx1000 Abandoned	2014	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Prevention), Optimistic Concurrency Control (OCC), Timestamp Ordering, Two-Phase Locking (Deadlock Detection)	Abandoned
	Derby Acquired Company Abandoned OLTP	1997	Relational	Two-Phase Locking (Deadlock Detection)	Acquired Company Abandoned OLTP
	Elasticsearch Search Engine NoSQL AI-Assisted	2004	Document / XML	Two-Phase Locking (Deadlock Detection)	Search Engine NoSQL AI-Assisted
	Espresso	2011	Document / XML	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)
FE	Ferrite OLTP	2024	Relational	Two-Phase Locking (Deadlock Detection)	OLTP
	FirstSQL/J Failed Company	2001	Relational	Two-Phase Locking (Deadlock Detection)	Failed Company
	GrapheneDB Hosting Service	2012	Graph	Two-Phase Locking (Deadlock Detection)	Hosting Service
	HyperGraphDB Abandoned	2007	Graph	Timestamp Ordering, Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Abandoned
	HyperSQL	2001	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)
	InfiniDB OLAP Abandoned Failed Company	2000	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	OLAP Abandoned Failed Company
	Infobright OLAP Acquired Company	2005	Relational	Two-Phase Locking (Deadlock Detection)	OLAP Acquired Company
	Ingres Acquired Company	1974	Relational	Deterministic Concurrency Control, Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Acquired Company
	Just Logic/SQL OLTP	1994	Relational	Two-Phase Locking (Deadlock Detection)	OLTP
	libSQL Forked Code OLTP	2022	Relational	Two-Phase Locking (Deadlock Prevention), Two-Phase Locking (Deadlock Detection)	Forked Code OLTP
	Linter	1990	Relational	Two-Phase Locking (Deadlock Detection)
	MariaDB AI-Assisted	2009	Relational	Two-Phase Locking (Deadlock Detection)	AI-Assisted
	Multigres Middleware AI-Assisted	2025	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Middleware AI-Assisted
	MySQL Acquired Company	1994	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Acquired Company
	Neo4j NoSQL AI-Assisted	2007	Graph	Two-Phase Locking (Deadlock Detection)	NoSQL AI-Assisted
	Neon Serverless Forked Code Acquired Company OLTP	2021	Relational	Multi-version Concurrency Control (MVCC)	Serverless Forked Code Acquired Company OLTP
	OpenSearch Forked Code Search Engine AI-Assisted	2021	Document / XML	Multi-version Concurrency Control (MVCC)	Forked Code Search Engine AI-Assisted
	Percona Server Forked Code	2006	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Forked Code
	PostgreSQL OLTP	1986	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	OLTP
	RaptorDB Forked Code	2024	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Forked Code
	RexDB Acquired Company	2006	Relational	Multi-version Concurrency Control (MVCC)	Acquired Company
	RonDB OLTP AI-Assisted	2020	Key-Value, Relational	Two-Phase Locking (Deadlock Detection)	OLTP AI-Assisted
	Sparksee	2006	Graph, Object-Oriented	Two-Phase Locking (Deadlock Detection)
	SQLite OLTP	2000	Relational	Two-Phase Locking (Deadlock Detection), Two-Phase Locking (Deadlock Prevention)	OLTP
	Swarm64 OLAP Acquired Company	2013	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	OLAP Acquired Company
SY	System R OLTP	1972	Relational	Two-Phase Locking (Deadlock Detection)	OLTP
	TDSQL	2012	Key-Value, Document / XML, Relational	Two-Phase Locking (Deadlock Detection)
	Teradata	1979	Document / XML, Graph, Relational	Two-Phase Locking (Deadlock Detection)
	TimescaleDB Time-Series AI-Assisted	2017	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Time-Series AI-Assisted
	TimesTen Acquired Company OLTP	1996	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Acquired Company OLTP
	TransLattice NewSQL Failed Company	2007	Relational	Multi-version Concurrency Control (MVCC)	NewSQL Failed Company
	VanillaDB Abandoned	2016	Multi-Value	Two-Phase Locking (Deadlock Detection)	Abandoned
	VillageSQL Forked Code OLTP Revival Project AI-Assisted	2025	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Forked Code OLTP Revival Project AI-Assisted
	Vitess Middleware AI-Assisted	2011	Relational	Multi-version Concurrency Control (MVCC), Two-Phase Locking (Deadlock Detection)	Middleware AI-Assisted
	WebScaleSQL Forked Code Abandoned	2014	Relational	Multi-version Concurrency Control (MVCC)	Forked Code Abandoned
	XAP NoSQL	2000	Document / XML	Optimistic Concurrency Control (OCC), Two-Phase Locking (Deadlock Detection)	NoSQL
	Xata Forked Code AI-Assisted	2020	Relational	Multi-version Concurrency Control (MVCC)	Forked Code AI-Assisted