Whether you write your own code or it is generated for you, this is a topic that is essential for business users who run SQL queries.
This session examines the English text that appears when an EXPLAIN is requested and why it is useful in your environment. You will learn what the Optimizer EXPLAIN Facility is, where the text is generated, how to read the EXPLAIN output, and what spool sizes and estimated times really represent. We will explore topics such as confidence levels, table scans, join preparation and processing including Merge, Exclusion and Product joins and multi-table joins, and the newest optimization features. At the end of this session you will be able to understand essential elements of the EXPLAIN and be able to use it to gain more value from your Teradata system and your queries.
Don’t miss this opportunity to learn about the value and usefulness of EXPLAIN in any Teradata environment.
Through this course, you will learn about the EXPLAIN facility, where it is generated, key phrases, and how to read the output.
Key Points:
- Inside a Teradata Node and what the VProcs do for your query
- The EXPLAIN Facility syntax and what it means
- EXPLAIN Examples
- Teradata Visual EXPLAIN
Updated and re-recorded in 2015.
Presenter: Alison Torres, Director, Teradata Labs Customer Briefing Team – Teradata Corporatio