Comdb2

Comdb2

Original author(s)	Combdb2 Team
Developer(s)	Comdb2 team, and other open source component developers
Initial release	1 January 2016 (2016-01-01)
Stable release	7.0
Written in	C
Operating system	Linux, Solaris, AIX
Available in	English
Type	RDBMS
License	Apache v2, BSD License, MIT License, Sleepycat License
Website	bloomberg.github.io/comdb2/

Comdb2 is an open source, highly available clustered RDBMS developed by Bloomberg LP, built on Optimistic concurrency control techniques. It provides multiple isolation levels, including Snapshot and Serializable Isolation. Read/Write transactions run on any node, with the client library transparently negotiating connections to lowest cost (latency) node which is available. Comdb2 implements queues for publisher-to-subscriber message delivery. Queues can be combined with table triggers for time-consistent log distribution.

Comdb2 supports the SQLite dialect of SQL with some modifications, and embeds the Lua scripting language. Comdb2 maintains a fork of Berkeley DB to provide the key–value database backend to SQLite.

Comdb2 architecture was described in detail in 2016 technical paper.

See also

• Comparison of relational database management systems
• Multi-master replication