I am searching to gain some knowledge for database system that best fits computer vision(and/or machine learning) systems. A database and methods for storing SIFT or any other popular image features and query for finding matches. So please name database and frameworks used for professional purposes like MySQL, PostgreSQL, MongoDB, HBase or any other suitable solutions that is best for numerical and high performance applications and explain your opinion. I wonder if I am thinking on the issue or asking the question in the right manner so please correct me if you find any misunderstandings.
Thanks in advance.