Oracle SQL Training Overview
This Oracle SQL Tuning for Developers and DBAs training class teaches attendees what the Oracle Cost Based Optimizer is doing with your SQL, and why it is doing it that way, and how to make the CBO do it better. Attendees learn how to reverse engineer the CBO’s decisions and experiment with alternatives, and then push the CBO towards better decisions.
Location and Pricing
Accelebrate offers instructor-led enterprise training for groups of 3 or more online or at your site. Most Accelebrate classes can be flexibly scheduled for your group, including delivery in half-day segments across a week or set of weeks. To receive a customized proposal and price quote for private corporate training on-site or online, please contact us.
In addition, some courses are available as live, instructor-led training from one of our partners.
Objectives
- Understand the concepts behind cost-based optimization
- Capture and read execution plans
- Gather various types of statistics
- Tune the basic operations: join order, join method, access method
- Use various index types
- Exploit the possibilities for SQL transformations and rewrites
- Apply a SQL tuning method
Prerequisites
- Understanding of Oracle database and instance architecture
- Familiarity with SQL and basic PL/SQL
- Able to work with Linux command-line tools
Outline
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Study the SQL Execution Cycle
- The parse-bind-execute-fetch steps
- Identify statements that need tuning
- The concepts behind cost-based optimization
Consider the Critical Decisions that Must be Made
- Join order
- Join method
- Access method
- The Filtered Rows Percentage tuning methodology
Capture and Understand Query Execution Plans
- EXPLAIN PLAN and SQL*Plus Autotrace
- SQL Trace
- Te DBMS_MONITOR package
- The DBMS_XPLAN package
- Reading query execution plans
Gather Statistics
- Object, system, and extended statistics
- Dynamic sampling and SQL directives
- Histograms
- Column group statistics
How and When to Make Use of Various Index Types
- B-tree indexes in all their forms
- Bitmap and bitmap join indexes
- Index use suppression - deliberate or otherwise
Determine When Different Join Methods and Access Methods are Appropriate
- Nested loop and hash joins, and other methods
- Scan access paths as opposed to indexed access paths
- Direct and indirect read
Use Hints
- Hints as an investigative tool
- Using hints in production
- Commonly used (and abused) hints
Appreciate the Possibilities for Query Re-writes and CBO Transformations
- Equivalent SQLs
- View merging
- Star transformations
- Correlated sub-queries
- Set operators
- Implications of null values
Understand the Possibilities for Reoptimization and Various Adaptive Capabilities
- Execution plan stability
- Adaptive reoptimization and adaptive execution plans
- Adaptive cursor sharing and bind variables
The Methodology
- Calculate optimal join orders and methods
- Look for common programmer errors
- Recognize problematic SQL structures and operations
- Validate statistics
Conclusion
Training Materials
All Oracle training students receive comprehensive courseware and a related textbook.
Software Requirements
- Intel dual-core i5 or faster processor on a 64-bit operating system with at least 8 GB RAM
- A complete installation of Oracle
- Please contact us for detailed setup instructions if you have purchased this class.
