Overview
These courses are being delivered by an IBM Global Training Provider
This course is designed to teach the students how to prevent SQL performance problems and how to improve the performance of existing SQL.
Prerequisites
- Familiarity with SQL
- Familiarity with Db2 12 for z/OS
- Familiarity with Db2 12 for z/OS application programming
Delegates will learn how to
After completing this course, students will be able to:
- Understand and design better indexes
- Determine how to work with the optimizer (avoid pitfalls, provide guidence)
- Optimize multi-table access
- Work with subqueries
- Avoid locking problems
- Use accounting traces and other tools to locate performance problems in existing SQL
- and more
Outline
Introduction to SQL performance and tuning
• Performance issues
• Simple example
• Visualizing the problem
• Summary
Performance analysis tools
• Components of response time
• Time estimates with VQUBE3
• SQL EXPLAIN
• The accounting trace
• The bubble chart
• Performance thresholds
Index basics
• Indexes
• Index structure
• Estimating index I/Os
• Clustering index
• Index page splits
Access paths
• Classification
• Matching versus Screening
• Variations
• Hash access
• Prefetch
• Caveat
More on indexes
• Include index
• Index on expression
• Random index
• Partitioned and partitioning, NPSI and DPSI
• Page range screening
• Features and limitations
Tuning methodology and index cost
• Methodology
• Index cost: Disk space
• Index cost: Maintenance
• Utilities and indexes
• Modifying and creating indexes
• Avoiding sorts
Index design
• Approach
• Designing indexes
Advanced access paths
• Prefetch
• List prefetch
• Multiple index access
• Runtime adaptive index
Multiple table access
• Join methods
• Join types
• Designing indexes for joins
• Predicting table order
Subqueries
• Correlated subqueries
• Non-correlated subqueries
• ORDER BY and FETCH FIRST with subqueries
• Global query optimization
• Virtual tables
• Explain for subqueries
Set operations (optional)
• UNION, EXCEPT, and INTERSECT
• Rules
• More about the set operators
• UNION ALL performance improvements
Table design (optional)
• Number of tables
• Clustering sequence
• Denormalization
• Materialized query tables (MQTs)
• Temporal tables
• Archive enabled tables
Working with the optimizer
• Indexable versus non-indexable predicates
• Boolean versus non-Boolean predicates
• Stage 1 versus stage 2
• Filter factors
• Helping the optimizer
• Pagination
Locking issues
• The ACID test
• Reasons for serialization
• Serialization mechanisms
• Transaction locking
• Lock promotion, escalation, and avoidance
More locking issues (optional)
• Skip locked data
• Currently committed data
• Optimistic locking
• Hot spots
• Application design
• Analyzing lock waits
Massive batch (optional)
• Batch performance issues
• Buffer pool operations
• Improving performance
• Benefit analysis
• Massive deletes
Frequently asked questions
How can I create an account on myQA.com?
There are a number of ways to create an account. If you are a self-funder, simply select the "Create account" option on the login page.
If you have been booked onto a course by your company, you will receive a confirmation email. From this email, select "Sign into myQA" and you will be taken to the "Create account" page. Complete all of the details and select "Create account".
If you have the booking number you can also go here and select the "I have a booking number" option. Enter the booking reference and your surname. If the details match, you will be taken to the "Create account" page from where you can enter your details and confirm your account.
Find more answers to frequently asked questions in our FAQs: Bookings & Cancellations page.
How do QA’s virtual classroom courses work?
Our virtual classroom courses allow you to access award-winning classroom training, without leaving your home or office. Our learning professionals are specially trained on how to interact with remote attendees and our remote labs ensure all participants can take part in hands-on exercises wherever they are.
We use the WebEx video conferencing platform by Cisco. Before you book, check that you meet the WebEx system requirements and run a test meeting (more details in the link below) to ensure the software is compatible with your firewall settings. If it doesn’t work, try adjusting your settings or contact your IT department about permitting the website.
How do QA’s online courses work?
QA online courses, also commonly known as distance learning courses or elearning courses, take the form of interactive software designed for individual learning, but you will also have access to full support from our subject-matter experts for the duration of your course. When you book a QA online learning course you will receive immediate access to it through our e-learning platform and you can start to learn straight away, from any compatible device. Access to the online learning platform is valid for one year from the booking date.
All courses are built around case studies and presented in an engaging format, which includes storytelling elements, video, audio and humour. Every case study is supported by sample documents and a collection of Knowledge Nuggets that provide more in-depth detail on the wider processes.
When will I receive my joining instructions?
Joining instructions for QA courses are sent two weeks prior to the course start date, or immediately if the booking is confirmed within this timeframe. For course bookings made via QA but delivered by a third-party supplier, joining instructions are sent to attendees prior to the training course, but timescales vary depending on each supplier’s terms. Read more FAQs.
When will I receive my certificate?
Certificates of Achievement are issued at the end the course, either as a hard copy or via email. Read more here.