In my Data Scientist roadmap one important issue is where to storage the information. You can storage the logs in Hadoop, but this is a first step that I will explain in other post. Then you can imagine that you can storage the info in a database.
Joining concepts like database and Big Data you will obtain a NonSQL best answer. But What is a NonSQL database?
First take a look in Wikipedia: “A NoSQL (often interpreted as Not only SQL) database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used inrelational databases. Motivations for this approach include simplicity of design, horizontal scaling, and finer control over availability. The data structures used by NoSQL databases (e.g. key-value, graph, or document) differ from those used in relational databases, making some operations faster in NoSQL and others faster in relational databases. The particular suitability of a given NoSQL database depends on the problem it must solve.”