M01_Introduction+to+Performance+Tuning_ed1.pdf

Database Performance Tuning
On Premise Cloud
Introduction to Performance Tuning
Atul Kumar
Oracle ACE & Author
Rajeev K.
Database Expert
/company/k21academy /k21academy /k21academy /k21academy contact@k21academy.com

Atul Kumar
www.k21academy.com/joincloud © Copyright 2018 | K21 Academy | All Rights Reserved

Rajeev.K
 Expert in Oracle Database & Cloud
 12+ Years Experience Managing Team of 25+
 Based in USA working with top Consultancy
 Trained 300+ trainees and 30+ corporate clients
 Oracle Certified Professional

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 Learn general concepts of database tuning
 Review the System Development Life Cycle
 Identify tuning goals and measurements
 Roles of DBA
 Oracle tuning tools
 Summary
Agenda: Module

Learn general concepts of
database tuning

 Database tuning is the ongoing process of optimizing the
operation of a database configuration based on attainable
tuning goals
 There are no quick formulas or specific methods for
tuning a database
 It depends on the “art” of developing good designs and
creativity in troubleshooting and analyzing problems as
well as the “science” of using technical tools to detect
problems before they occur
Database Tuning Overview

Review the System
Development Life Cycle

 System Development Life Cycle
 Agile Development
 Rapid application development
 Prototyping development
 Waterfall development
System Development Methodologies

 Referred to as the SDLC
 Purpose of the SDLC
 Establishes a consistent framework for development
 Provides a solution to solve a problem
 Delivers the application design and code that has
been reviewed and signed off by technical leads

 Short-cutting the SDLC leads to
 Inferior system design
 Poor system architecture
 Inefficient application code
 Performance problems
 Lower user productivity

Identify tuning goals and
measurements

 Performance-tuning goals must be measured by the
following criteria:
 Database response time
 Database availability
 Database statistics and ratios
 CPU utilization
 Memory utilization
 Disk thrashing or paging
 Excessive I/O (caused by reads and writes)
Tuning Goals

Tuning Goals

 Performance problems are classified as follows:
 Contention problems
 Resource consumption problems
 Scalability problems
 Architectural problems
 Application problems
 Network problems
Performance Problems

Roles Of DBA

 A DBA must be involved in all phases of the SDLC
 DBA tasks for each of the SDLC phases:
 Planning phase:
 Identify new resources and capacities that are required for
the new system
 Analyze the business functions of the new system to
determine database features and functions
 Identify database performance goals and objectives
DBA Tasks

 Logical design phase:
 Identify the type of database application
 Gather data from existing system and business requirements
 Analyze data and identify all entities
 Identify relationships between entities
 Create a conceptual data model
 Identify degrees of relationships and cardinalities
 Identify data constraints and validation techniques
 Normalize data model
DBA Tasks

 Physical design phase:
 Decide which database management system will be employed
 Examine the features of the database management system to
be used
 Create a storage capacity plan
 Analyze initial data and growth
 Design database procedures to implement business rules
 Identify data migration procedures
 Identify and create backup and recovery strategies
DBA Tasks

 Continuous Development
 Decide which database management system will be employed
 Examine the features of the database management system to
be used
 Create a storage capacity plan
 Analyze initial data and growth
 Design database procedures to implement business rules
 Identify data migration procedures
 Identify and create backup and recovery strategies
DBA Tasks

 Continuous Integration
 Test database connections
 Test all database procedures and scripts
 Identify database configuration problems
 Document database maintenance procedures and Devops
tasks
 Test backup and recovery strategies
DBA Tasks

 Continuous Deployment
 Identify problematic queries
 Use tools to monitor the database and install scripts
 Tune and improve database performance as required
 Gather database statistics and analyze results to determine
whether performance goals are met
 Perform Devops tasks
 Verify backups and perform random recovery testing
DBA Tasks

 The DBA should be focused on the following activities:
 Be involved in all SDLC phases
 Recommend best practices in data modeling and database
designs
 Educate developers on how to optimize their code (queries)
 Work with designers and developers
 Recommend to developers SQL tuning tools
 Monitor database performance
 Collect and analyze database statistics
 Educate users on best practices for working with database
applications
DBA Tasks

Oracle tuning tools

 Performance Views (V$ Views)
 Data dictionary views
 Oracle Optimizer
 Oracle Optimizer Hints
 Explain Plan Statement
 SQL Trace
 Stored Outlines or SQL Plan Management
 SQL Profiles
Oracle Tuning Utilities

 Enterprise Manager Diagnostic Pack:
 AWR Reports
 Performance Page
 ASH Analytics Page
 ADDM Page
 Adaptive thresholds and metrics pages
Oracle Tuning Tools

 Enterprise Manager Tuning Pack:
 SQL Real-Time Monitoring Page
 SQL Details Page
 SQL Tuning Advisor
 SQL Tuning Set
 SQL Performance Analyzer
Oracle Tuning Tools

 Introduction to Oracle Optimizer
 Cost Based Optimizer Fundamentals
 Traditional costing model
 CPU costing model
 Writing efficient SQL
 Query Transformations
 Summary
Summary Module

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