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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Analyzing data using Automatic Database Diagnostic Monitor (ADDM)
In this recipe, we present the Automatic Database Diagnostic Monitor, a tool which analyzes the data collected by AWR to diagnose the cause of a performance problem, providing advice on how to solve the issue.
Getting ready
ADDM is enabled by default in Oracle Database 11g; it depends upon two configuration parameters of the init.ora file, STATISTICS_LEVEL and CONTROL_MANAGEMENT_PACK_ACCESS. The value for these parameters should be TYPICAL or ALL for the former and DIAGNOSTIC or DIAGNOSTIC+TUNING for the latter. To show the current parameter values, we can use the following statement:
SHOW PARAMETER STATISTICS_LEVEL SHOW PARAMETER CONTROL_MANAGEMENT_PACK_ACCESS
While to set the parameters ...
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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.