This traditional database platforms, known as relational database management systems (RDBMS) all use a language called SQL (structured query language).

FORBES: Combating the Big Data skills shortage

Most importantly, it means that DBAs who have spent so much of their time, energy, and money in developing their skills in the traditional RDBMS world will have a new future in the Big Data world.

FORBES: Combating the Big Data skills shortage

Now, RDBMS and SQL somewhat goes directly against the principles that forced Hadoop to be created in the first place, which is requirement to have a predefined structure (known as a schema) of the data being stored.

FORBES: Combating the Big Data skills shortage