I'm not sure this blog that seems to talk about the problems of NoSQL databases in general makes a lot of sense. If you read the comments, you certainly see lots of complaints, but I also think the post isn't well written. It lists the problems of RDBMSes as possibly deleting all tables while changing a key or being unable to add a column easily. While I don't know about all RDBMSes, I don't know any that could lose all data with anything less than DROP DATABASE.

At the same time, the NoSQL complaints and problems seem to be generally presented, which isn't good. The various NoSQL flavors of databases vary widely and the way you look at a columnar or graph database is much different than a document database. Really, the piece ought to be separated to look at a certain class of NoSQL database compared with RDBMSes.

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