The top journals are peer reviewed scholarly journals. These provide high quality, meticulously reviewed and rapid publication, to cater the insistent need of scientific community. These journals are indexed with all their citations noted. The devices used for data storage developed rapidly from big, heavy and bulky magnetic drums that stored a few kilobytes of data to the latest micro chips that store a few giga or terabytes of data. To facilitate this drastic change, advanced methods of data storage, data transmission, data manipulation and data retrieval played a key role. To make all these processes work in co-ordination with each other and smooth storage, maintenance and retrieval of data, Database Management Systems were introduced.