I am new in teradata world , i used to use Oracle as my database. if any one can tell me from where to start learning teradata concepts, and what is the difference between oracle and teradata in performance.
Depending on the usability of the system one has the advantage over the other, e.g. for OLTP systems you get much better performance in Oracle than Teradata but for OLAP systems Teradata has advantage.
Search in google, you should be able to find some whitepapers!