Databases with Repeatable Read Isolation Levels


	Adaptive Server Enterprise Acquired Company	1987	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	Acquired Company
	AgensGraph Forked Code Multi-Model Acquired Company	2013	Document / XML, Graph, Key/Value, Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	Forked Code Multi-Model Acquired Company
	AlloyDB OLAP Forked Code OLTP	2022	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	OLAP Forked Code OLTP
	Altibase OLTP	1999	Relational	Read Committed, Repeatable Read, Serializable	OLTP
	ArcadeDB Forked Code AI-Assisted	2021	Document / XML, Graph, Key/Value, Relational	Read Committed, Repeatable Read	Forked Code AI-Assisted
	Azure HorizonDB Forked Code	2026	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	Forked Code
	Azure SQL Database Hosting Service	2009	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable, Snapshot Isolation	Hosting Service
	Bitsy	2013	Graph	Read Committed, Repeatable Read
	Brytlyt OLAP Forked Code Acquired Company	2013	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	OLAP Forked Code Acquired Company
	ClearDB Acquired Company	2010	Relational	Read Uncommitted, Read Committed, Serializable, Repeatable Read	Acquired Company
	Clustrix NewSQL Acquired Company OLTP	2006	Relational	Read Committed, Repeatable Read, Serializable	NewSQL Acquired Company OLTP
	CrateDB	2014	—	Read Committed, Read Uncommitted, Repeatable Read, Serializable
	Cubrid AI-Assisted	2008	Relational	Read Committed, Serializable, Snapshot Isolation, Repeatable Read	AI-Assisted
	Db2	1983	Document / XML, Relational	Cursor Stability, Repeatable Read, Read Uncommitted
	Derby Acquired Company Abandoned OLTP	1997	Relational	Read Committed, Serializable, Read Uncommitted, Repeatable Read	Acquired Company Abandoned OLTP
	Dolt Versioning AI-Assisted	2018	Relational	Repeatable Read	Versioning AI-Assisted
	DynamoDB OLTP NoSQL	2012	Document / XML, Key/Value	Read Committed, Read Uncommitted, Repeatable Read	OLTP NoSQL
	Espresso	2011	Document / XML	Repeatable Read, Read Committed, Read Uncommitted, Serializable, Snapshot Isolation
	ExtendDB Middleware AI-Assisted	2026	Key/Value, Document / XML	Read Uncommitted, Read Committed, Repeatable Read	Middleware AI-Assisted
	eXtremeDB Cache Time-Series OLTP Middleware	2001	Key/Value, Entity-Relationship, Relational, Column Family / Wide-Column	Read Committed, Serializable, Repeatable Read	Cache Time-Series OLTP Middleware
	FirstSQL/J Failed Company	2001	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	Failed Company
	Geode Cache Forked Code OLTP NoSQL	2015	Key/Value	Read Uncommitted, Repeatable Read	Cache Forked Code OLTP NoSQL
	GridGain	2007	Key/Value	Read Committed, Serializable, Repeatable Read
	Hekaton OLTP	2012	Relational	Read Committed, Serializable, Snapshot Isolation, Repeatable Read	OLTP
	Ignite	2014	Key/Value	Read Committed, Serializable, Repeatable Read
	Ingres Acquired Company	1974	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	Acquired Company
	ITTIA DB Time-Series OLTP	2000	Relational	Read Committed, Serializable, Repeatable Read	Time-Series OLTP
	Just Logic/SQL OLTP	1994	Relational	Read Committed, Repeatable Read, Serializable	OLTP
	Kudu OLTP	2016	Relational	Read Committed, Snapshot Isolation, Repeatable Read	OLTP
	MariaDB AI-Assisted	2009	Relational	Read Committed, Serializable, Repeatable Read, Read Uncommitted	AI-Assisted
	Mimer SQL	1974	Relational	Repeatable Read
	MongoDB NoSQL AI-Assisted	2009	Document / XML	Read Committed, Read Uncommitted, Repeatable Read, Snapshot Isolation	NoSQL AI-Assisted
	Multigres Middleware AI-Assisted	2025	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	Middleware AI-Assisted
	MySQL Acquired Company	1994	Relational	Read Committed, Serializable, Repeatable Read, Read Uncommitted	Acquired Company
	Neon Serverless Forked Code Acquired Company OLTP	2021	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	Serverless Forked Code Acquired Company OLTP
NE	Neoview Abandoned	2007	Relational	Read Uncommitted, Read Committed, Repeatable Read	Abandoned
	Netlify Database Serverless Hosting Service	2024	Relational	Read Committed, Repeatable Read, Serializable, Snapshot Isolation	Serverless Hosting Service
	NonStop SQL Acquired Company OLTP	1987	Relational	Read Committed, Read Uncommitted, Repeatable Read	Acquired Company OLTP
OP	open-gpdb OLAP Forked Code	2024	Relational	Read Committed, Repeatable Read, Serializable	OLAP Forked Code
	OrientDB Multi-Model Acquired Company NoSQL	2010	Document / XML, Graph, Key/Value, Object-Oriented	Read Committed, Repeatable Read	Multi-Model Acquired Company NoSQL
	Percona Server Forked Code	2006	Relational	Read Uncommitted, Read Committed, Serializable, Repeatable Read	Forked Code
	PieCloudDB OLAP	2021	Relational	Read Committed, Serializable, Snapshot Isolation, Repeatable Read	OLAP
	PolarDB	2017	Relational	Repeatable Read
	PostgreSQL OLTP	1986	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable, Snapshot Isolation	OLTP
	PrestoDB OLAP AI-Assisted	2013	Document / XML, Key/Value, Column Family / Wide-Column, Relational	Read Committed, Serializable, Read Uncommitted, Repeatable Read	OLAP AI-Assisted
	quasardb	2008	Key/Value	Repeatable Read
	RaptorDB Forked Code	2024	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	Forked Code
	RethinkDB Failed Company NoSQL	2009	Document / XML	Repeatable Read	Failed Company NoSQL
	RexDB Acquired Company	2006	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable, Snapshot Isolation	Acquired Company
	RonDB OLTP AI-Assisted	2020	Key/Value, Relational	Read Committed, Repeatable Read	OLTP AI-Assisted
	SmallSQL Abandoned	2005	Relational	Read Uncommitted, Repeatable Read, Serializable	Abandoned
	solidDB Acquired Company OLTP	1992	Relational	Read Committed, Repeatable Read, Serializable	Acquired Company OLTP
	SQL Server	1988	Relational	Read Uncommitted, Read Committed, Repeatable Read, Serializable, Snapshot Isolation
	Swarm64 OLAP Acquired Company	2013	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	OLAP Acquired Company
	TiDB NewSQL AI-Assisted	2015	Key/Value	Read Committed, Repeatable Read	NewSQL AI-Assisted
	TiKV AI-Assisted	2016	Key/Value	Read Committed, Repeatable Read	AI-Assisted
	TimescaleDB Time-Series AI-Assisted	2017	Relational	Read Committed, Serializable, Read Uncommitted, Repeatable Read	Time-Series AI-Assisted
	TransLattice NewSQL Failed Company	2007	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	NewSQL Failed Company
	VanillaDB Abandoned	2016	Multi-Value	Read Committed, Serializable, Repeatable Read	Abandoned
	VillageSQL Forked Code OLTP Revival Project AI-Assisted	2025	Relational	Read Uncommitted, Read Committed, Serializable, Repeatable Read	Forked Code OLTP Revival Project AI-Assisted
	Vitess Middleware AI-Assisted	2011	Relational	Read Uncommitted, Read Committed, Serializable, Repeatable Read	Middleware AI-Assisted
	WarehousePG Forked Code AI-Assisted	2025	Relational	Read Committed, Repeatable Read, Serializable	Forked Code AI-Assisted
	WebScaleSQL Forked Code Abandoned	2014	Relational	Read Committed, Serializable, Repeatable Read	Forked Code Abandoned
	XAP	2000	Key/Value	Read Committed, Repeatable Read, Read Uncommitted
	Xata Forked Code AI-Assisted	2020	Relational	Read Committed, Serializable, Repeatable Read	Forked Code AI-Assisted