Judged on my experience, by storing millions of keys in Tyrant, I would say it's very durable. While this is a great blog post, I think the author misses statin

Judged on my experience, by storing millions of keys in Tyrant, I would say it's very durable. While this is a great blog post, I think the author misses stating that Tyrant supports master-master replication and "hot" backups - which makes Tyrant _much_ more durable. Making fallback code is also pretty easy for a master-master systems (much easier than doing it for master-slave systems like MySQL is - - which for most parts require manual work, while fallback code for a master-master system can be automated ). It should be stated that there are tools for MySQL that enable "automatic" fallback for MySQL: http://code.google.com/p/mysql-master-master/ http://code.google.com/p/mysql-master-master/