IBM DB2 is a Relational database which stores the data in the form of rows and columns. Mainframe operating system allows users to build, access and maintain Relational databases using SQL(Structured Query Language). Types of Database System Hierarchical - IMS DB Network - IDMS Relational - DB2, Oracle etc. In this video, I have explained the important concepts in DB2. Please subscribe and like the video. Share our channel IIWOWIIS with your friends and colleagues.