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Course Outline
Application Tuning Methodology
Database and Instance Architecture
- Server processes
- Memory structures (SGA, PGA)
- Parsing and shared cursors
- Data files, log files, and parameter files
Execution Plan Analysis
- Hypothetical plans (EXPLAIN PLAN, SQLPlus AutoTrace, XPlan)
- Actual execution plans (V$SQL_PLAN, XPlan, AWR)
Performance Monitoring and Identifying Process Bottlenecks
- Monitoring the current instance status via system dictionary views
- Monitoring historical data dictionaries
- Application tracing (SQL Trace, TkProf, Tracesess)
The Optimisation Process
- Characteristics of the cost-based optimiser and its regulation
- Strategies for optimisation
Controlling the Cost-Based Optimiser
- Session and instance parameters
- Hints
- Query plan patterns
Statistics and Histograms
- Impact of statistics and histograms on performance
- Methods for collecting statistics and histograms
- Strategies for counting and estimating statistics
- Statistics management: blocking, copying, editing, automation of collection, and monitoring changes
- Dynamic data sampling (temporary tables, complex predicates)
- Multi-column statistics based on expressions
- System statistics
Logical and Physical Database Structure
- Tablespaces
- Segments
- Extents
- Blocks
Data Storage Methods
- Physical aspects of tables
- Temporary tables
- Index-organized tables
- External tables
- Partitioned tables (range, list, hash, composite)
- Physical table reorganization
Materialized Views and Query Rewrite Mechanism
Data Indexing Methods
- Building B-TREE indexes
- Index characteristics
- Index types: unique, multi-column, function-based, reverse
- Compressed indexes
- Rebuilding and coalescing indexes
- Virtual indexes
- Private and public indexes
- Bitmap indexes and clustering
Case Study - Full Data Scans
- Impact of table placement and block reads on performance
- Conventional and direct path data loading
- Predicate ordering
Case Study - Index-Based Data Access
- Index read methods (UNIQUE SCAN, RANGE SCAN, FULL SCAN, FAST FULL SCAN, MIN/MAX SCAN)
- Using function-based indexes
- Index selectivity (Clustering Factor)
- Multi-column indexes and SKIP SCAN
- Handling NULL values in indexes
- Index Organized Tables (IOT)
- Impact of indexes on DML operations
Case Study - Sorting
- Sort memory usage
- Index sorts
- Linguistic sorting
- The effect of entropy on sorting (Clustering Factor)
Case Study - Joins and Subqueries
- Join types: MERGE, HASH, NESTED LOOP
- Joins in OLTP and OLAP systems
- Join order optimisation
- Outer Joins
- Anti-join
- Semi Joins
- Simple subqueries
- Correlated subqueries
- Views and the WITH clause
Other Cost-Based Optimiser Operations
- Buffer Sort
- IN-LIST
- VIEW
- FILTER
- Count Stop Key
- Result Cache
Distributed Queries
- Reading query plans for use over database links
- Selecting the driving site
Parallel Processing
Requirements
- Proficiency in the basics of SQL and familiarity with the Oracle database environment (completion of training such as 'Native SQL for Programmers - Workshops' for Oracle 11g is preferred)
- Practical experience working with Oracle databases
28 Hours
Testimonials (2)
1. I liked the trainer's style of presenting and the patience to explain. 2. I liked that the trainer answered our side questions, even the ones that took the discussion a bit farther from the presentation, which showed flexibility. 3. I liked that there was a practical lab, not just a theoretical part. 4. I liked that it was online.
Roxana - DB Global Technology
Course - Oracle 11g - Application Tuning - Workshop
Trainer expertise on SQL tuning
