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Oracle Database 11gR2 Performance Tuning Cookbook
book

Oracle Database 11gR2 Performance Tuning Cookbook

by Ciro Fiorillo
January 2012
Intermediate to advanced
542 pages
11h 28m
English
Packt Publishing
Content preview from Oracle Database 11gR2 Performance Tuning Cookbook

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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Publisher Resources

ISBN: 9781849682602Other