Is there a lightweight, embeddable, key/value database? (something like diet couchdb) [closed]
On the Related Projects page of the CouchDB wiki, under "Alternatives" they mention some similar projects:
- Feather DB* CouchDB clone in java.
- StrokeDB* A CouchDB-like database written in Ruby to make embedding into Ruby apps easier.
- mongoDB A high-performance, open source, schema-free document-oriented database.
And of course Tokyo Cabinet which has already been mentioned.
There's also neo4j which is a "graph database" for java.
Of course, part of the power of CouchDB and some of the others is not just being able to store key/value pairs, but the high capacity, replication, and in particular views, which are basically the way of running queries over your documents.
If you just needed a simple key/value datastore that you can embed into your program, that doesn't have to hold gigs of data, the venerable GDBM might suit your needs.
A little hard to answer without knowing a bit more about your needs (programming language, concurrency requirements, data volumes and such).
* Web site does not appear to be working at the time of this writing.
Would TinyCDB be suitable?
http://www.corpit.ru/mjt/tinycdb.html
Introduction
TinyCDB is a very fast and simple package for creating and reading constant data bases, a data structure introduced by Dan J. Bernstein in his cdb package. It may be used to speed up searches in a sequence of (key,value) pairs with very big number of records. Example usage is indexing a big list of users - where a search will require linear reading of a large /etc/passwd file, and for many other tasks. It's usage/API is similar to ones found in BerkeleyDB, gdbm and traditional *nix dbm/ndbm libraries, and is compatible in great extent to cdb-0.75 package by Dan Bernstein.
CDB is a constant database, that is, it cannot be updated at a runtime, only rebuilt. Rebuilding is atomic operation and is very fast - much faster than of many other similar packages. Once created, CDB may be queried, and a query takes very little time to complete.