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

Introduction


The Teradata database provides various effective ways to improve the performance of a query. Indexes are the most important part of designing the database structure. Indexes not only provide an effective way to store data, but also help in determining effective access paths to data.

The commonly used indexes in Teradata are:

  • Unique/non-unique primary index (UPI/NUPI)
  • Unique/non-unique secondary index (USI/NUSI)
  • Partitioned primary index (PPI)
  • Join index (JI)

Think of an index as a two-field table: one contains a value, and the other a pointer to instances of that value in a data table:

Teradata is the relation database management system, RDBMS, which uses hashing to distribute rows across the AMPs; the value is added into an entity called a row hash, which is used as the pointer. The row hash is addressed to the value in the table. The Teradata RDBMS uses this row hash address as a retrieval index.

The following are characteristics of indexes:

  • An index is used not only to distribute...