DBDB.io The Encyclopedia of Database Systems · Est. 2017
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Database of Databases

1,197 Systems Ranked

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Country of Origin
United States of America 565
China 95
Germany 75
United Kingdom 63
Canada 38
France 35
Russia 31
India 26
Netherlands 24
Japan 20
Data Model
RE Relational 469
KE Key-Value 248
DO Document / XML 217
GR Graph 89
OB Object-Oriented 64
VE Vector 50
TR Triplestore / RDF 28
CO Column Family / Wide-Column 28
AR Array / Matrix 22
NE Network 10
Query Interface
CU Custom API 486
SQ SQL 422
HT HTTP / REST 153
CO Command-line / Shell 67
ST Stored Procedures 26
CY Cypher 23
SP SPARQL 21
GR GraphQL 18
DA Datalog 16
PL PL/SQL 16
Compatibility
PostgreSQL PostgreSQL 54
MySQL MySQL 43
Redis Redis 34
MongoDB MongoDB 19
Prometheus Prometheus 9
Oracle RDBMS Oracle RDBMS 7
Memcached Memcached 7
Neo4j Neo4j 6
RocksDB RocksDB 6
SQLite SQLite 6
Derived From
PostgreSQL PostgreSQL 37
MySQL MySQL 25
Redis Redis 9
RocksDB RocksDB 7
ClickHouse ClickHouse 6
Cassandra Cassandra 5
Elasticsearch Elasticsearch 4
LMDB LMDB 4
Spark SQL Spark SQL 4
Cloud BigTable Cloud BigTable 3
Embeds / Uses
RocksDB RocksDB 35
SQLite SQLite 21
LMDB LMDB 17
PostgreSQL PostgreSQL 15
Berkeley DB Berkeley DB 12
LevelDB LevelDB 11
MySQL MySQL 11
FoundationDB FoundationDB 7
DataFusion DataFusion 7
Cassandra Cassandra 6
Hosted Offerings
MySQL MySQL 6
ClickHouse ClickHouse 5
PostgreSQL PostgreSQL 4
SQL Server SQL Server 3
Db2 Db2 2
Redis Redis 2
Neo4j Neo4j 1
CouchDB CouchDB 1
DuckDB DuckDB 1
Informix Informix 1
Source Code License
PR Proprietary 338
AP Apache v2 307
MI MIT License 168
BS BSD License 62
AG AGPL v3 52
GP GPL v2 48
GP GPL v3 35
MO Mozilla Public License 18
BU Business Source License 16
LG LGPL v2 14
Implementation Language
C+ C++ 234
JA Java 161
C C 149
GO Go 119
RU Rust 110
PY Python 53
C# C# 38
JA JavaScript 34
ER Erlang 14
TY TypeScript 13
Project Type
OP Open Source 777
CO Commercial 592
HO Hobby 180
AC Academic 91
IN Industrial Research 19
ED Educational 11
IN Internal / Non-Public 9
Developers
IBM Corporation IBM Corporation 17
Google LLC Google LLC 16
Amazon.com, Inc. Amazon.com, Inc. 13
University of California, Berkeley University of California, Berkeley 11
Meta Platforms Inc Meta Platforms Inc 11
Massachusetts Institute of Technology Massachusetts Institute of Technology 10
Microsoft Corporation Microsoft Corporation 10
Oracle Corporation Oracle Corporation 9
SAP SE SAP SE 8
LinkedIn Corporation LinkedIn Corporation 8
Acquisitions
Oracle Corporation Oracle Corporation 10
IBM Corporation IBM Corporation 8
SAP SE SAP SE 7
Rocket Software, Inc. Rocket Software, Inc. 7
Teradata Corporation Teradata Corporation 4
Actian Corporation Actian Corporation 4
Sybase Inc. Sybase Inc. 3
Microsoft Corporation Microsoft Corporation 3
Cisco Cisco 3
Apple Inc. Apple Inc. 3