Database Reference
In-Depth Information
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Client
: RESTful JSON API that allows access from any language capable of making HTTP
requests.
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CAP
: Eventually consistent. Replication is used to synchronize multiple copies of data on
different nodes. CouchDB features ACID semantics similar to many relational database sys-
tems.
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Production use
: CouchDB is not yet in a 1.0 release as of this writing, but it is used in pro-
duction in a variety of social websites and software applications. See
http://bit.ly/dn73DY
for a list of specific production instances.
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Additional features
: MapReduce, incremental replication, and fault-tolerance are all sup-
ported. Comes with a web console.
MongoDB
MongoDB is perhaps most similar to CouchDB. It purports to combine the best of key-value
stores, document databases, object databases, and RDBMS. That is, it shards automatically as
with a key-value store, allows JSON-based dynamic schema documents, and offers a rich query
language in the manner of a relational database.
NOTE
If you'd like to read more about MongoDB, check out the O'Reilly book MongoDB:TheDeinitive
Guide,by Kristina Chodorow and Michael Dirolf.
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Website
:
http://www.mongodb.org
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Orientation
: Document
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Created
: Developed at 10gen by Geir Magnusson and Dwight Merriman
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Implementation language
: C++
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Distributed
: Yes
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Schema
: JSON-style documents are stored, and you can use dynamic schemas.
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CAP
: MongoDB uses a single master for any shard, making it completely consistent.
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Production use
: MongoDB is used in production at SourceForge, Bit.ly, Foursquare,
GitHub, Shutterfly, Evite, The New York Times, Etsy, and many more.
