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 […]
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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 […]
IMS DB – Logical Database IMS database has a rule that each segment type can have only one parent. This limits the complexity of the physical database. Many DL/I applications require a complex structure that allows a segment to have two parent segment types. To overcome this limitation, DL/I allows the DBA to implement logical […]