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1
Q: 

Document vs key-value databases?

Possible Duplicate:
Difference between Document-based and Key/Value-based databases?

What are the pros and cons of document (mongodb/couchdb) and key-value (riak/redis) databases?

Aren't document databases more powerful than simple key-value databases?

Why would I use for example riak over couchdb that seems more powerful?

A: 

More powerful usually means less scalable or lower performance or more complex to operate. It is not like the simpler solutions do not include more features just because they do not like features. There is a trade-off to be made.

Thilo  2010-10-14 03:57:18

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