itwbennett writes "Sauce Labs had outgrown CouchDB and too much unplanned downtime made them switch to MySQL. With 20-20 hindsight they wrote about their CouchDB experience. But Sauce certainly isn't the first organization to switch databases. Back in 2009, Till Klampaeckel wrote a series of blog posts about moving in the opposite direction — from MySQL to CouchDB. Klampaeckel said the decision was about 'using the right tool for the job.' But the real story may be that programmers are never satisfied with the tool they have." Of course, then they say things like: "We have a TEXT column on all our tables that holds JSON, which our model layer silently treats the same as real columns for most purposes. The idea is the same as Rails' ActiveRecord::Store. It’s not super well integrated with MySQL's feature set — MySQL can’t really operate on those JSON fields at all — but it’s still a great idea that gets us close to the joy of schemaless DBs."
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