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I haven’t used PostgreSQL and TokyoTyrant so, can’t say much about them. And technically, I really don’t think that one should compare MySQL which is relational database with document based non-relational databases like: CouchDB and MongoDB.

In my opinion, MongoDB out-performs CouchDB in terms of querying, insertion and ease of usage but CouchDB’s support for MVCC and transaction are quite interesting. One of the crons of MongoDB is it’s data size grow at freaking high rate.

Thoough great to see that, NOSQL (NOt Only SQL) is on full swing.

Download OpenSQL comparison PDF (Don’t forget to read the conclusion though) via HackerNews.