Databases with Read Uncommitted Isolation Levels


	Access	1992	Relational	Read Uncommitted
	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
	Assassin Abandoned Peer-to-Peer	2020	Key-Value	Read Uncommitted	Abandoned Peer-to-Peer
	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
	Bedrock Blockchain OLTP AI-Assisted	2016	Relational	Serializable, Snapshot Isolation, Read Uncommitted	Blockchain OLTP AI-Assisted
	BigchainDB Abandoned Blockchain	2015	Document / XML, Key-Value	Snapshot Isolation, Read Uncommitted	Abandoned Blockchain
	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
	CovenantSQL Abandoned Blockchain	2018	Relational	Serializable, Snapshot Isolation, Read Uncommitted	Abandoned Blockchain
	CrateDB	2014	—	Read Committed, Read Uncommitted, Repeatable Read, Serializable
	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
	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
	FirstSQL/J Failed Company	2001	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	Failed Company
FO	ForestDB Abandoned	2013	Key-Value	Read Committed, Read Uncommitted	Abandoned
	Geode Cache Forked Code OLTP NoSQL	2015	Key-Value	Read Uncommitted, Repeatable Read	Cache Forked Code OLTP NoSQL
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	Read Committed, Read Uncommitted, Serializable	OLAP Forked Code Acquired Company
	H2	2004	Relational	Read Committed, Serializable, Read Uncommitted
	HBase NoSQL	2007	Column Family / Wide-Column	Read Committed, Read Uncommitted	NoSQL
	Impala OLAP AI-Assisted	2013	Relational	Read Committed, Read Uncommitted	OLAP AI-Assisted
	Ingres Acquired Company	1974	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable	Acquired Company
	Kyoto Cabinet DBM	2009	Key-Value	Read Uncommitted, Serializable	DBM
	libSQL Forked Code OLTP	2022	Relational	Read Uncommitted, Serializable, Snapshot Isolation	Forked Code OLTP
	MariaDB AI-Assisted	2009	Relational	Read Committed, Serializable, Repeatable Read, Read Uncommitted	AI-Assisted
	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
	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
	OpenTSDB Time-Series Abandoned	2010	Key-Value	Read Committed, Read Uncommitted	Time-Series Abandoned
	Percona Server Forked Code	2006	Relational	Read Uncommitted, Read Committed, Serializable, Repeatable Read	Forked Code
	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
	RaptorDB Forked Code	2024	Relational	Read Uncommitted, Read Committed, Serializable, Snapshot Isolation, Repeatable Read	Forked Code
	RexDB Acquired Company	2006	Relational	Read Committed, Read Uncommitted, Repeatable Read, Serializable, Snapshot Isolation	Acquired Company
	rqlite AI-Assisted	2014	Relational	Serializable, Snapshot Isolation, Read Uncommitted	AI-Assisted
	SequoiaDB	2011	Document / XML	Read Committed, Read Stability, Read Uncommitted
	SmallSQL Abandoned	2005	Relational	Read Uncommitted, Repeatable Read, Serializable	Abandoned
	SQLite OLTP	2000	Relational	Read Uncommitted, Serializable, Snapshot Isolation	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
	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
	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
	WiredTiger Acquired Company AI-Assisted	2008	Key-Value	Read Committed, Snapshot Isolation, Read Uncommitted	Acquired Company AI-Assisted
	XAP NoSQL	2000	Document / XML	Read Committed, Read Uncommitted, Repeatable Read	NoSQL
	Xata Forked Code AI-Assisted	2020	Relational	Read Committed, Serializable, Repeatable Read	Forked Code AI-Assisted