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

Using MultiLoad to delete


MultiLoad, unlike FastLoad, has the capability to not only insert, but can also be used for update, delete, and upserts. MultiLoad can be executed on channels and network connected systems. You can insert up to five non-empty tables using MultiLoad. 

Traditional MLOAD is not capable of loading data into tables that have USI-unique secondary indexes, RI-referential integrity, JI-join indexes, NoPI, or tables with triggers. But MLOADX overcomes this limitation and loads data into any table with the earlier restrictions.

In this recipe, we will use MLOAD to delete the rows, based on the equality conditions mentioned. 

MLOAD delete should be chosen over SQL delete when a large number of rows need to be deleted and the table size is big. 

Getting ready

A user requires the following privileges/rights in order to execute the MultiLoad:

  • SELECT and INSERT (CREATE and DROP or DELETE) access to the target or loading table
  • SELECT, INSERT, UPDATE, and DELETE are required privileges...