About Information Management System (IMS)

IBM’s IMS, is a database and transaction management system that provides an interface for users to access information in various databases via on-line transactions. The IMS/TM (Transaction Manager) is a message-based transaction processor, that handles the execution of specific business application programs. The IMS/DB (Database) is an entirely separate component providing access to the IMS hierarchical database for applications running under the IMS/TM, as well as IMS transaction monitor and OS/390 batch jobs.