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What is a Transformation in Informatica

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A transformation is a repository object that generates, modifies, or passes data. The Designer provides a set of transformations that perform specific functions. For example, an Aggregator transformation performs calculations on groups of data.

Transformations in a mapping represent the operations the Informatica Server performs on the data. Data passes into and out of transformations through ports that you connect in a mapping or mapplet.

Transformations can be active or passive. An active transformation can change the number of rows that pass through it, such as a Filter transformation that removes rows that do not meet the configured filter condition. A passive transformation does not change the number of rows that pass through it, such as an Expression transformation that performs a calculation on data and passes all rows through the transformation.

Transformations can be connected to the data flow, or they can be unconnected. An unconnected transformation is not connected to other transformations in the mapping. It is called within another transformation, and returns a value to that transformation
Transformation Descriptions
Transformation
Type
Description
Advanced External Procedure
Active/
Connected
Calls a procedure in a shared library or in the COM layer of Windows NT.
Aggregator
Active/
Connected
Performs aggregate calculations.
ERP Source Qualifier
Active/
Connected
Represents the rows that the Informatica Server reads from an ERP source when it runs a session.
Expression
Passive/
Connected
Calculates a value.
External Procedure
Passive/
Connected or Unconnected
Calls a procedure in a shared library or in the COM layer of Windows NT.
Filter
Active/
Connected
Filters records.
Input
Passive/
Connected
Defines mapplet input rows. Available only in the Mapplet Designer.
Joiner
Active/
Connected
Joins records from different databases or flat file systems.
Lookup
Passive/
Connected or Unconnected
Looks up values.
Normalizer
Active/
Connected
Normalizes records, including those read from COBOL sources.
Output
Passive/
Connected
Defines mapplet output rows. Available only in the Mapplet Designer.
Rank
Active/
Connected
Limits records to a top or bottom range.
Sequence Generator
Passive/
Connected
Generates primary keys.
Source Qualifier
Active/
Connected
Represents the rows that the Informatica Server reads from a relational or flat file source when it runs a session.
Router
Active/
Connected
Routes data into multiple transformations based on a group expression.
Stored Procedure
Passive/
Connected or Unconnected
Calls a stored procedure.
Update Strategy
Active/
Connected
Determines whether to insert, delete, update, or reject records.
XML Source Qualifier
Passive/
Connected
Represents the rows that the Informatica Server reads from an XML source when it runs a session.
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