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

Identifying multi-column stats


With Teradata 14.10, we now have the ability to collect stats not only on columns, but on tables and expressions as well. With better analysis and consideration, you can achieve good performance improvement in queries.

The way you implement collecting statistics plays a vital role in improving performance. We need to discover the optimal way to make use of statistics. Collecting statistics blindly on columns or expressions may help one time, but in the long term it may degrade the performance of the query.

Once we identify the column on which we are ready to collect statistics, we need to identify the type of stats to be collected. Should we collect on them individually, or combine them all into one?

Getting ready

To collect statistics, you need to connect to the Teradata database using Teradata Studio or SQLA.

How to do it...

  1. Identify the query on which multi-column stats need to be collected.
  2. Identify the columns that are joined using AND conditions. Columns that...