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Module 13: Performance Tuning

Module 13: Performance Tuning. Overview. Performance tuning methodologies Instance level Database level Application level Overview of tools and techniques for performance analysis and tuning. Tuning Methodologies — Tuning While Building.

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Module 13: Performance Tuning

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  1. Module 13: Performance Tuning

  2. Overview • Performance tuning methodologies • Instance level • Database level • Application level • Overview of tools and techniques for performance analysis and tuning

  3. Tuning Methodologies — Tuning While Building • The Tuning While Building methodology offers a proactive approach to performance tuning • These are the steps: • Tune the business rules • Tune the data design • Tune the application • Tune the instance • Tune the underlying platform

  4. Tuning Methodologies — Performance Tuning • Performance tuning is an ongoing, interactive process • Performance Improvement Method offers steps in improving performance of a system in production: • Define the problem • Examine the host system and the Oracle statistics • Examine documentation to help identify the problem • Generate a prognosis based on captured data • Propose a course of action and implement the changes • Evaluate the causes of the changes • If unsuccessful, repeat previous two steps

  5. Application Tuning • Tune Application Design — Leverage RDBMS features • Example: Perform calculations and summaries on the database before fetching the results so as to leverage database resources as well as to reduce network traffic • Tune Logical Structure of Database — Leverage supporting schema objects • Example: choose appropriate indexes • Tune Database Operations • Find statements that consume most resources — Use statistics available in system catalog, such as parses, CPU time, physical reads • Tune the statements to use fewer resources — Use coding standards and tools to analyze and tune SQL • Tune Access Paths — Aid Optimizer in finding optimal access path, creating indexes, clustered indexes, and providing optimizer hints

  6. Demonstration 1: Data Compression In this demonstration you will learn to: • Use the Compression Wizard to benefit from ROW or PAGE type options. • Understand how to calculate compression savings with the wizard or with scripts • Implement compression with the wizard or with scripts.

  7. Demonstration 2: SQL Server Profiler In this demonstration you will learn to: • Use the SQL Server Profiler to capture events within SQL Server as it is being used. • Choose the type of events to monitor • Review the activities by Replaying the trace at a later time. • Generate script templates for traces.

  8. Demonstration 3: Hints (T-SQL) In this demonstration you will learn to: • Enforce a MERGE JOIN in a query. • Benefit from the OPTIMIZE FOR hint. • Override the row locking default with a TABLOCK hint. • Remove all shared locks with the NOLOCK hint.

  9. Demonstration 4: Plan Guides In this demonstration you will learn to: • Override an existing query with a Plan Guide. • Use the new SQL Server 2008 interface to implement Plan Guides.

  10. Instance Tuning • Tune Memory Allocation • Proper configuration and use of the caches that make up the SGA (Oracle) and memory pool (SQL Server) • Tune I/O and Physical Structures • Separation of files based on access • Distribution of I/O load across files and devices • Tune Resource Contention • Reduce and/or eliminate contention for locks, latches, block (page) headers, and queues

  11. SQL Server Performance Tuning Tools • Profiler — records detailed information on activity on the database server, including I/O statistics, CPU statistics, index and table scans, execution plans and several other statistics to aid in tuning SQL and T-SQL • Performance Data Collector — fully integrated tool that collects a variety of performance metrics on one or more SQL Servers and stores the data in a central data warehouse • Build custom reports showing trends • Query Editor in SSMS — graphical tool used to execute and debug queries to resolve performance issues • Database Engine Tuning Advisor — database physical design tool to optimize indexes and partitioning • Replaces Index Tuning Wizard from previous SQL Server releases • Performance Monitor —Windows tool that records counters at hardware, operating system, database, and application levels • Task Manager — used for initial review of high-level counters on the system, including utilization at a process level

  12. Review • We learned performance tuning methodologies, including ‘Tuning While Building’ to be used starting with application design process and ‘Performance Improvement Method’ to be used to tune production systems • We discussed steps in tuning an application, including tuning application design, access paths, logical structure, and operations at the database • We went over steps in tuning an instance, including tuning memory allocation, resource contention, and I/O and physical structures • We were introduced to a set of tools available in SQL Server and Microsoft Windows that aid in tuning at hardware, operating system, database, and application levels, and achieving overall optimal performance

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