Oracle Database Performance Project

Carlos Oliveira / May 31, 2012

Agenda

Oracle Text OverviewIntroductionProblemPropositionReasoningTuning AreaSolutionApplication TuningTraining & ReferenceQuestions

IntroductionI am a forward-looking Information Systems Architect with a solid Oracle DBA background comprising the daily infrastructure tasks of the DBA, several projects as a Data Modeler, and performance management projects.

I Started on the mainframe business, and soon had a deep dive in application development for Oracle databases. After acquiring an Oracle certification, I worked on performance enhancement for applications using Oracle databases, and later worked several years as an infrastructure DBA, later I worked on data modeling projects and more recently a performance management project, on both application and database layers.

“Knowledge is of two kinds. We know a subject ourselves, or we know where we can findinformation upon it.

Samuel Johnson

• Business Disruption• Call Centers Losing Sales• Loss of Customer Trust & Satisfaction

Problem

• Applications• Not designed for best performance• Frequent changes

• Servers• Upgrades limited by hardware• New server - not a long term solution

Proposition• Applications

• Do not act within application with only application knowledge

• Servers and Database• Do not act within database with only database knowledge

Do act within Application with Servers and Database knowledge

Reasoning• Where should the tuning effort be directed? • Database Design:

Poor system performance usually results from a poor database design.

• Application Tuning: Experience shows that approximately 80% of all Oracle system performance

problems are resolved by coding optimal SQL.

• Memory Tuning: Properly size your database buffers by looking at your wait events, buffer hit ratios,

system swapping and paging, etc.

• Disk I/O Tuning: Database files needs to be properly sized and placed to provide maximum disk

subsystem throughput.

• Eliminate Database Contention: Study database locks, latches and wait events carefully and eliminate where

possible.

• Tune the Operating System: Monitor and tune operating system CPU, I/O and memory utilization.

(Source: http://www.orafaq.com/wiki/Oracle_database_Performance_Tuning_FAQ)

Tuning Area Chosen

Desig

n

Applic

atio

n

Mem

ory

I/O

Conte

ntio

nOS

0%10%20%30%40%50%60%70%80%90%

Impact

Impact

It’s clear we should prioritize Application Tuning due to its impact in performance

* Most cost-effective approach on solving performance problems.

ToolsSoftware

CommercialIn-house

TrainingSharepoint

LibraryBest practicesGuidelinesUseful scripts

SolutionMonitoring

Real-time monitoringAd hoc monitoring

ConsultingWalkthroughReviewFinal acceptanceCommunication

Application TuningStarts with good knowledge of SQL and PL/SQLOracle Database features (special indexes, materialized views, execution plan, …)Metalink:

Oracle Performance Diagnostic Guide (OPDG) [ID 390374.1]

Tools:ADDM (Automated Database Diagnostics Monitor) Oracle 10g TKProf Trace and Trace AnalyzerStatspack Oracle Enterprise Manager - Tuning Pack (cost option) Old UTLBSTAT.SQL and UTLESTAT.SQL - Begin and end stats monitoring

TrainingResources at Oracle website

•Performance Tuning Guide and Referencehttp://docs.oracle.com/cd/B10500_01/server.920/a96533/toc.htm

•SQL Referencehttp://docs.oracle.com/cd/B10500_01/server.920/a96540/toc.htm

•PL/SQL User's Guide and Referencehttp://docs.oracle.com/cd/B10500_01/appdev.920/a96624/toc.htmLook at my publications in LinkedIn for specific tuning approaches.

Thank you

http://linkedin.com/in/carlosoliveira

Carlos Oliveira / May 31, 2012