January 2012
Intermediate to advanced
542 pages
11h 28m
English
Content preview from Oracle Database 11gR2 Performance Tuning 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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Configuring and using SQL Baselines
We have seen the importance of execution plan stability in Managing stored outlines.
The disadvantage (by design) of using stored outlines is in the rigidity—we are sure that our execution plans don't change—so the performance doesn't deteriorate. However, due to schema or data changes, there could be a better execution plan. We are bound to our execution plan that is stored in the outlines, and we cannot benefit from the improvements.
SQL Plan Management with SQL Plan Baselines, a feature new to Oracle Database 11g, helps us in obtaining planning stability without losing the opportunity for performance improvements.
Getting ready
To create SQL Baselines we need the ADMINISTER SQL MANAGEMENT OBJECT privilege.
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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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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.