What is a Transformation?

A transformation is a repository object which reads the data, modifies the data and passes the data. Transformations in a mapping represent the operations that the integration service performs on the data.

Transformations can be classified as active or passive, connected or unconnected.

Active Transformations:

A transformation can be called as an active transformation if it performs any of the following actions.

  • Change the number of rows: For example, the filter transformation is active because it removes the rows that do not meet the filter condition. All multi-group transformations are active because they might change the number of rows that pass through the transformation.
  • Change the transaction boundary: The transaction control transformation is active because it defines a commit or roll back transaction.
  • Change the row type: Update strategy is active because it flags the rows for insert, delete, update or reject.


Note: You cannot connect multiple active transformations or an active and passive transformation to the downstream transformation or transformation same input group. This is because the integration service may not be able to concatenate the rows generated by active transformations. This rule is not applicable for sequence generator transformation.

Passive Transformations:

Transformations which does not change the number of rows passed through them, maintains the transaction boundary and row type are called passive transformation.

Connected Transformations:

Transformations which are connected to the other transformations in the mapping are called connected transformations.

Unconnected Transformations:

An unconnected transformation is not connected to other transformations in the mapping and is called within another transformation, and returns a value to that.

The below table lists the transformations available in Informatica version 9:

Transformation

Type

Description

Aggregator

Active/Connected

Performs aggregate calculations.

ApplicationSourceQualifier

Active/Connected

Represents therows that the Integration Service reads from an application, such as an ERP source, when it runs a session.

Custom

ActiveorPassive/Connected

Calls a procedure in a shared library or DLL.

DataMasking

Passive/Connected

Replaces sensitive production data with realistic test data for non-production environments.

Expression

Passive/Connected

Calculates a value.

ExternalProcedure

Passive/ConnectedorUnconnected

Calls a procedure in a shared library or in the COM layer of Windows.

Filter

Active/Connected

Filters data.

HTTP

Passive/Connected

Connects to an HTTP server to read or update data.

Input

Passive/Connected

Defines mapplet input rows. Available in the Mapplet Designer

Java

ActiveorPassive/Connected

Executes user logic coded in Java.The byte code for the user logic is stored in the repository

Joiner

Active/Connected

Joins data from different databases or flat file systems.

Lookup

ActiveorPassive/ConnectedorUnconnected

Lookup and return data from a flat file, relational table, view, or synonym.

Normalizer

Active/Connected

Source qualifier for COBOL sources. Can also use in the pipeline to normalize data from relational or flat file sources.

Output

Passive/Connected

Defines mapplet output rows. Available in the Mapplet Designer.

Rank

Active/Connected

Limits records to a top or bottom range.

Router

Active/Connected

Routes data into multiple transformations based on group conditions.

SequenceGenerator

Passive/Connected

Generates primary keys.

Sorter

Active/Connected

Sorts data based on a sort key.

SourceQualifier

Active/Connected

Represents the rows that the Integration Service reads from a relational or flat file source when it runs a session.

SQL

ActiveorPassive/Connected

Executes SQL queries against a database.

StoredProcedure

Passive/ConnectedorUnconnected

Calls a stored procedure.

TransactionControl

Active/Connected

Defines commit and rollback transactions.

Union

Active/Connected

Merges data from different databases or flat file systems.

UnstructuredData

ActiveorPassive/Connected

Transforms data in unstructured and semi-structured formats.

UpdateStrategy

Active/Connected

Determines whether to insert, delete, update, or reject rows.

XMLGenerator

Active/Connected

Reads data from one or more input ports and outputs XML through a single output port.

XMLParser

Active/Connected

Reads XML from one input port and outputs data to one or more output ports.

XMLSourceQualifier

Active/Connected

Represents the rows that the Integration Service reads from an XML source when it runs a session.