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OCP Instructors Guide for Oracle DBA Certification

Chapter 7 - Tuning and Performance

Performance Tuning Intelligent Advisories

Experienced DBAs often start their tuning efforts by selecting data from the V$ dynamic performance tables to view system-wide performance indicators. For those of you new to Oracle, statistics are pieces of information that the Oracle instance collects to help administrators gauge performance and identify problems. But intelligent performance advisories are a relatively new concept (they are introduced in Oracle9i), so a quick definition is in order before we continue.

An advisory is a collection of information that predicts the impact a specific change would have on the item being monitored. Advisories allow administrators to simulate "what if" hypothetical scenarios to predict the impact a specific change may have on the Oracle environment.

For example, the v$shared_pool_advice view contains information about estimated parse time savings if a different shared pool size were used. Each row in the view contains a percentage value (ranging from 50 percent to 200 percent of the current shared pool) and the estimated performance increase or decrease associated with that percentage of change.

The above text is an excerpt from:

OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot

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