Answer:
It may underestimate the importance of RDBMS in real world as, database system for storing the multimedia object images and images,consequently the objects and operation become more complex that is why, it is degrading the performance of the application in RDBMS. It is also dependence on the structure query language as, it is comparatively simple query optimization and unable to handle complex applications.
A relational database is a combination of many relation in the form of two dimensional table of rows and the columns containing tuples. The rows are called as records and the columns are called as attributes.