title: Are there any documented projects where CouchDB was tried and rejected?
body: <p>I keep seeing references to the idea that "<a href="http://couchdb.apache.org/" rel="nofollow noreferrer">CouchDB</a> may not be the best tool in every situation." This is good to know, but unfortunately also applies to every technology.</p>
  
  <p>What would be much more helpful is a description of how CouchDB was tried on a project and subsequently abandoned for a traditional SQL database.</p>
  
  <p>If you've tried CouchDB on a project and later gone back to a SQL database, what factors played the biggest role?</p>