IMS Interview Questions and Answers - DoAnswers.com

Information Management System. Composed of two systems: a Database Manager (IMS DB) and a Transaction Manager (IMS TM). IMS DB: Information Management System Database Manager. IBM�s venerable (introduced in 1968) large system hierarchical DBMS. In casual conversation, either IMS1 DB or IMS TM may be referred to simply as IMS without anyone complaining. Following the introduction of DB2, it was assumed, both inside and outside IBM, that IMS DB would die a slow death as DB2�s performance improved to approach that of IMS DB. But, it never happened, mainly because of the number of major IMS-based applications at large organizations worldwide. Once IBM realized this, a major effort was made to keep both IMS DB and IMS TM up to date with the latest trends, such as Web enablement, though nobody proposed making it into a relational DBMS

IMS Interviews are getting tough these days as the technology grows faster. To get through the IMS interview one needs to update him/herself in a regular manner. Having said that, just before the interview, it is very important to have a quick glance of the reputed IMS questions and answers to make yourself comfortable during the interview process. This is where DoAnswers.com helps you in renewing yourself on IMS and various other technologies interview preparation.

ACB stands for APLICATION CONTROL BLOCK.It Contains the information of the PSB with the corresponding DBD information.

A Hierarchy chart is a pictorial representation of the total of a DL/I database starting from the root, giving all the parent child relationships that exist within the database

Multi positioning is an option where by IMS maintains a separate position on each hierarchical path. when more than one PCBs refer to the same DBD , it is called Multi positioning.

PSB(Program specification block): Informs about how a specific program is to be access one or more IMS DB. It consists of PCB. PCB (Prg Communication Block): Information to which segment in DB can be accessed, what the program is allowed to do with those segment and how the DB is to be accessed. ACB(Access Control Block): are generated by IMS as an expansion of information contained in the PSB in order to speed up the access to the applicable DBD's.

Secondary indexing is a feature which allows the program to sequentially retrieve segments or search for segments in a sequence other than key sequence.

SSA stands for SEGMENT SEARCH ARGUMENTS which is used to describe which segments to be retrieved.