title: Drive space hungry NoSQL's databases
body: <p>I've tested NoSQL databases like CouchDB, MongoDB and Cassandra and observed tendence to absorbing very large amount of drive space relative to inserted key-value pairs. 
  When comparing CouchDB and MySQL schemaless databases CouchDB is consuming much more drive space than MySQL. 
  I know about that key-value DBs by default are versioning and have long uuid and need key optimalisation - the comparison was between about 15 mln rows in MySQL and 1-5 mln documents listed NoSQL DB's.</p>
  
  <p><strong>My question is</strong> : Is there any NoSQL with good compaction / compression of data?
  So that I can have NoSQL database with a size closer to 5GB than 50GB?</p>