March 2012
Intermediate to advanced
442 pages
9h 31m
English
Content preview from IBM DB2 9.7 Advanced Application Developer CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using section explain information
Starting from DB2 9.7 Fix Pack 1, DB2 introduced the section explain functionality that allows us to capture explain information using the contents of a run-time section. Using section explains, we can get information about the actual execution values along with the estimated values provided by the EXPLAIN command. In this recipe, we will discuss how we can extract explain information from a section, and compare the estimated and actual values in the access plan.
Getting ready
We should have EXPLAIN tables created before we can capture any explain information.
How to do it...
To obtain the estimated and actual explain information, perform the following steps:
- Enable section actuals: Update the
SECTION_ACTUALSdatabase ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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