Book Image

Teradata Cookbook

By : Abhinav Khandelwal, Viswanath Kasi, Rajsekhar Bhamidipati
Book Image

Teradata Cookbook

By: Abhinav Khandelwal, Viswanath Kasi, Rajsekhar Bhamidipati

Overview of this book

Teradata is an enterprise software company that develops and sells its eponymous relational database management system (RDBMS), which is considered to be a leading data warehousing solutions and provides data management solutions for analytics. This book will help you get all the practical information you need for the creation and implementation of your data warehousing solution using Teradata. The book begins with recipes on quickly setting up a development environment so you can work with different types of data structuring and manipulation function. You will tackle all problems related to efficient querying, stored procedure searching, and navigation techniques. Additionally, you’ll master various administrative tasks such as user and security management, workload management, high availability, performance tuning, and monitoring. This book is designed to take you through the best practices of performing the real daily tasks of a Teradata DBA, and will help you tackle any problem you might encounter in the process.
Table of Contents (19 chapters)
Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Loading data from flat to Teradata


In the following recipe, we will use FastLoad to load data from a flat file to Teradata. The following are some known issues which degrade the performance of the load utility:

  • Unclean data decreases the efficiency of the apply phase
  • Unclean data, like duplicate unique indexes, duplicate rows, and constraint violations put loads on error tables
  • Uneven distribution of rows

The loading of data is done in staging tables when following the traditional ETL process. We can club FastLoad with SQLs to increase the performance of ETL, as shown in the following figure:

Fastload can be invoked on a channel attached system to load data via a disk or using a flat file on a network attached system. You can load data from:

  • Special input module (INMOD) routines
  • Any other device providing properly formatted source data

Getting ready

The following are some prerequisites before loading data using FastLoad:

  • Target table in Teradata should be empty
  • Log table to capture all processing
  • Flat...