A Database is a collection of related data items organized in a way that can be processed by application programs.
A Database Management System is used to define and maintain the structure of the database.
► Increases data independence
► Reduces data redundancy
► Provides data communication facilities
► Reduces data maintenance
► Provides data integrity and security
► Provides indexing capabilities
IMS (Information Management System) is IBM’s hierarchical database management system. It has mainly two components: IMS DB and IMS DC (also know as IMS TM)
IMS DB - IMS/Database Manager as the name implies manages the IMS databases. It is used for physical storage creation and management and data retrieval.
IMS DC / IMS TM - IMS/Data Communications or IMS/Transaction Manager handles online transaction processing system.
► Follows inverted tree structure
► Data relationship is predefined by it's structure
► Program accesses the data through predefined paths.
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