IMS DB – Data Manipulation The different data manipulation methods used in IMS DL/I calls are as follows − ISRT Call Get Hold Calls REPL Call DLET Call Let us consider the following IMS database structure to understand the data manipulation function calls − ISRT Call Points to note − ISRT call is known as […]
Category Archives: ims Db
IMS DB – Recovery The database administrator needs to plan for the database recovery in case of system failures. Failures can be of many types such as application crashes, hardware errors, power failures, etc. Simple Approach Some simple approaches to database recovery are as follows − Make periodical backup copies of important datasets so that […]
IMS DB – Structure Hierarchical Structure An IMS database is a collection of data accommodating physical files. In a hierarchical database, the topmost level contains the general information about the entity. As we proceed from the top level to the bottom levels in the hierarchy, we get more and more information about the entity. Each […]