A mapping is a set of source and target definitions linked by transformation objects that define the rules for data transformation. Mappings represent the data flow between sources and targets. When the Integration Service runs a session, it uses the instructions configured in the mapping to read, transform, and write data.
Every mapping must contain the following components:
A mapping can also contain one or more mapplets. A mapplet is a set of transformations that you build in the Mapplet Designer and can use in multiple mappings.
When you add an object to a mapping, you configure the properties according to the way you want the Integration Service to transform the data. You also connect the mapping objects according to the way you want the Integration Service to move the data. You connect the objects through ports.
The Mapping Designer displays objects in three different views:
Some objects in a mapping are also stored as independent objects in the repository:
The mapping is dependent on these objects. When this metadata changes, the Designer and other PowerCenter Client applications track the effects of these changes on mappings. In these cases, you may find that mappings become invalid even though you do not edit the mapping. When a mapping becomes invalid, the Integration Service cannot run it properly, and the Workflow Manager invalidates the session.
The only objects in a mapping that are not stored as independent repository objects are the non-reusable transformations that you build within the mapping. These non-reusable transformations are stored within the mapping only.
Developing a Mapping
Use the following steps as a guideline when you develop a mapping:
PowerCenter also provides a tool that you can use to create a template for a PowerCenter mapping and generate multiple mappings from the template. Mapping Architect for Visio provides an Informatica stencil for the Microsoft Office Visio software that contains shapes representing PowerCenter mapping objects. You can use the mapping object shapes to draw the mapping template on the Visio drawing window.
Using The Designer
Working With Sources
Working With Flat Files
Working With Targets
Mapping Parameters And Variables
Working With User-defined Functions
Using The Debugger
Viewing Data Lineage
Managing Business Components
Creating Cubes And Dimensions
Using The Mapping Wizards
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