MongoDB vs. Redis vs. Cassandra for a fast-write, temporary row storage solution

Question

I\'m building a system that tracks and verifies ad impressions and clicks. This means that there are a lot of insert commands (about 90/second average, peaking at 250) and some

Answer 1

I have hand-on experience with mongodb, couchdb and cassandra. I converted a lot of files to base64 string and insert these string into nosql.
mongodb is the fastest. cassandra is slowest. couchdb is slow too.

I think mysql would be much faster than all of them, but I didn't try mysql for my test case yet.