Components of Mappings

Mapping Source : Mapping sources are the objects from where you fetch the source data. It can be a database, flat file, XML source or COBOL file source
Mapping target: Mapping target is our destination where final processed data gets loaded. Mapping target can be a relational table of a database, a flat file or XML file. Sources and targets are mandatory in any mapping, their type can differ
Mapping Parameters and Variables : Mapping parameters and variables helps you to create temporary variables that will help you define and store temporary values while mapping data processing. Mapping parameters and variables are optional users defined data types, which can be created for mapping and can be referenced and updated for a specific requirement. We will learn more about mapping parameters and variables in this section
Mapplets : They are objects which consist of a set of transformation, source or targets. Mapplets are generally created to reuse the existing functionality of a set of transformations. It can be used in any of the mappings.

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Introduction to mappings in Informatica PowerCenter