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Tuesday, 23 July 2013

pentaho data integration (PDI) basics

Pentaho Online Tutorial

Transformations :
 * A Transformation is made of Steps linked by Hops. 
 * These Steps and Hops form paths through which data flows. 
 * Therefore it's said that a Transformation is data-flow oriented.

Jobs are used to coordinate ETL activities such as:
• Defining the flow and dependencies for what order transformations should be run
• Preparing for execution by checking conditions such as, "Is my source file available?," or "Does a table exist?"
• Performing bulk load database operations
• File Management such as posting or retrieving files using FTP, copying files and deleting files
 Sending success or failure notifications through email

Pentaho Data Integration Components

Pentaho Data Integration is composed of the following primary components:
  • Spoon. Introduced earlier, Spoon is a desktop application that uses a graphical interface and editor for transformations and jobs. Spoon provides a way for you to create complex ETL jobs without having to read or write code. When you think of Pentaho Data Integration as a product, Spoon is what comes to mind because, as a database developer, this is the application on which you will spend most of your time. Any time you author, edit, run or debug a transformation or job, you will be using Spoon.
  • Pan. A standalone command line process that can be used to execute transformations and jobs you created in Spoon. The data transformation engine Pan reads data from and writes data to various data sources. Pan also allows you to manipulate data.
  • Kitchen. A standalone command line process that can be used to execute jobs. The program that executes the jobs designed in the Spoon graphical interface, either in XML or in a database repository. Jobs are usually scheduled to run in batch mode at regular intervals.
  • Carte. Carte is a lightweight Web container that allows you to set up a dedicated, remote ETL server. This provides similar remote execution capabilities as the Data Integration Server, but does not provide scheduling, security integration, and a content management system.

What's with all the Culinary Terms?

If you are new to Pentaho, you may sometimes see or hear Pentaho Data Integration referred to as, "Kettle." To avoid confusion, all you must know is that Pentaho Data Integration began as an open source project called. "Kettle." The term, K.E.T.T.L.E is a recursive that stands for KettleExtraction Transformation Transport Load Environment. When Pentaho acquired Kettle, the name was changed to Pentaho Data Integration. Other PDI components such as Spoon, Pan, and Kitchen, have names that were originally meant to support a "restaurant" metaphor of ETL offerings.