Book Image

Microsoft SQL Server 2012 Integration Services: An Expert Cookbook

Book Image

Microsoft SQL Server 2012 Integration Services: An Expert Cookbook

Overview of this book

SQL Server Integration Services (SSIS) is a leading tool in the data warehouse industry - used for performing extraction, transformation, and load operations. This book is aligned with the most common methodology associated with SSIS known as Extract Transform and Load (ETL); ETL is responsible for the extraction of data from several sources, their cleansing, customization, and loading into a central repository normally called Data Warehouse or Data Mart.Microsoft SQL Server 2012 Integration Services: An Expert Cookbook covers all the aspects of SSIS 2012 with lots of real-world scenarios to help readers understand usages of SSIS in every environment. Written by two SQL Server MVPs who have in-depth knowledge of SSIS having worked with it for many years.This book starts by creating simple data transfer packages with wizards and illustrates how to create more complex data transfer packages, troubleshoot packages, make robust SSIS packages, and how to boost the performance of data consolidation with SSIS. It then covers data flow transformations and advanced transformations for data cleansing, fuzzy and term extraction in detail. The book then dives deep into making a dynamic package with the help of expressions and variables, and performance tuning and consideration.
Table of Contents (23 chapters)
Microsoft SQL Server 2012 Integration Services: An Expert Cookbook
Credits
Foreword
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Checkpoints: The power of restartability


Data transfer packages may transfer millions of rows every night and if one or more tasks fail during execution this may cause the package to fail. If we re-run a failed package then it will start from the first executable object in control flow, and this will be a problem because maybe a Data Flow Task which transferred 10 million records last night re-executed and got a lot of resource again; that doesn't sound worthy.

SSIS packages can be restartable, they can store the status of execution and start execution from the previous status, these are all supported by checkpoints. One of the most understandable definitions for checkpoint can be found in video games; Checkpoint will save the status of the game, and if the player failed, then the game will restart from the last status which was stored by the checkpoint.

SSIS Checkpoint provides a way to re-run package from the failed executable. In this recipe, we will take a look at how to use checkpoint...