I\'ve touched a Teradata. I\'ve never touched hadoop, but since yesterday, I am doing some research on that. By description of both, they seem quite interchangable, but in some
I think this article titled 'MapReduce and Parallel DBMSs: Friends or Foes' does quite a good job describing the situations where each technology works best. In a nutshell, Hadoop is excellent for storing unstructured data and running parallel transformations to 'sanitize' incoming data, where DBMSs excel at executing complex queries quickly.