Alternative to BerkeleyDB?

Question

I'm looking for a dbm-like library that I can use in place of Berkeley DB, which I'm currently using. My main reason for switching is the licensing fees for BDB are pretty high (free for open source apps, but my employer does not want to open source this particular app for various reasons).

I've looked briefly at qdbm but it doesn't look like it will fill my needs -- lots of keys (several million) and large data items (> 1-5 megabytes). Before I continue my search I figured I'd ask because it seems there are tons of dbm-like libraries out there.

Answer 1

You could try JDBM. It is a free (Apache 2) key-value store with disk persistence. Simple API and high performance

Answer 2

db4o is pretty cheap and fast but it can only be used with java or .net

Answer 3

Firebird is your best friend.

Answer 4

C/C++

• http://sphia.org/ a Key/Value Store, Written in C and BSD-Licensed.
• https://code.google.com/p/leveldb/ Written in C++, also BSD-Licensed
• http://luxio.sourceforge.net/ Written in C++, LGPL, faster than Berkeley DB
• http://symas.com/mdb/ Written in C, License is OpenLDAP Public License (BSD-Like)
• https://github.com/davidar/sdbm Written in C, Public Domain, Reimplementation of "ndbm"
• http://repetae.net/computer/vsdb/ Written in C, License unknown, Experimental
• https://github.com/stevedekorte/skipdb Written in C, BSD-Licensed, Key-value Store using Skip-List indexes
• http://unqlite.org/ written in C/C++, Embedded NoSQL Database Engine, BSD-Licensed, Similar to SQLite.
• http://hamsterdb.com/ Written in C/C++, Embedded NoSQL Database Engine, Apache License 2.0.

Java

• https://github.com/dain/leveldb A Java port of LevelDB, Apache License 2.0
• https://github.com/jingwei/krati A former LinkedIn Project, Apache License 2.0
• http://www.mapdb.org/ An Embedded Java Database, Apache License 2.0, supports Key-Value Storage, very efficient Object serialisation
• https://github.com/OpenHFT/Chronicle-Map, LGPL v3, embedded pure Java key-value store, faster than Berkeley DB
• https://github.com/jetbrains/xodus, Apache License 2.0, a Java transactional schema-less embedded database, faster than Berkeley DB
• https://github.com/lmdbjava/lmdbjava, JNI binding for LMDB, Apache License 2.0

Answer 5

SQLite is public domain, meaning you can use it for any purpose whatsoever, and is widely used and supported.

Answer 6

Postgres or HSQLDB and possible even H2 database