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

How to copy statistics


Collect statistics can be prefixed and used with many commands. It helps to use collect stats efficiently. Some privileges need to be granted when using these commands.

Let us suppose you are tuning a query which involves some terabytes of tables with 100 million rows. You have a requirement to change the PI, or to add a PPI, or to change the joining conditions, to analyze the query. Without changing the definition of the table, you are not able to check the explain plan. The only way you can achieve this is by changing the table structure, which needs a lot of resources and needs to be done during off-peak hours. And you don't even know if changing the DDL will work. So, to achieve this, we can create a copy of the table with the changed PI and copy just stats with no data.

Getting ready

Connect to the Teradata database via Studio or SQLA. Identify tables which stats need to be copied to, and the table from which stats needs to be copied. Both tables from which stats...