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.

GE,GB,GD,GK,GP,AI,AB,AC,AK,AJ,AM,AU,DJ,II,IX,QC,QD,H... GE - segment not found GB - end of database

A Qualified SSA contains Key field as well as search field and parenthesis An unqualified SSA does not contain key field and parenthesis

Command codes extends the function of a SSA call. It simplifies programming and it improves performance. *C - Concatenated key, D-path call, F- first occurrence, L- last occurrence, N- path call ignore , P-set parentage.

There are two control block.1.dbd(database descriptor)2.psb (program specification block)

There are 2 types of SSA?S . QUALIFIED SSA: It is used to retrieve a particualar occurence of a segment. UNQUALIFIED SSA: It is used when no particular segment occurence is requested.

Message Input Data (MID):Describes the input message as the application program sees it. Message Output Data (MOD):Describes the output message as the application program formats it. Data Input Format (DIF):Describes the screen format for accepting input from the user. Data Output Format (DOF):Describes the screen format as the user sees it.

Occurrences of all the segment types under a single parent segment occurrence is called a Twin.