Articles & Content


DB2 for z/OS SQL Performance Choices (F10)

Topic: DB2 for z/OS

Subtopic: 2009

DATE: 2009-10-7 (09:45 - 10:45)
SPEAKERS: Daniel Luksetich (YL&A)

This presentation puts some substance behind the statement "it depends"! There are many different ways to code a SQL statement to answer a given question. While the answer will be the same, the performance can vary dramatically depending upon the statement construct and data structure. Here we will look at the different major ways of coding SQL, and when is the proper way to code which technique. Learn about how to effective code joins, table expressions, and subqueries the correct way for the correct situation.

EXP. LEVEL: Intermediate,Advanced


Understand advanced SQL coding constructs

determine how the statement can affect performance

develope an understanding of how the data stored affects performance

learn about index choices and clustering

understand that Explain isn't always right

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