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Bottleneck Elimination Tuning usually implies fixing a performance problem. However, tuning should be part of the life cycle of an applicationthrough the analysis, design, coding, production, and maintenance stages. Often, the tuning phase is left until the database is in production.
At this time, tuning becomes a reactive process, where the most important bottleneck is identified and fixed.
A statement's execution plan is the sequence of operations Oracle performs to run the statement. The row source tree is the core of the execution plan. It also helps you to understand the optimizer decisions, such as why the optimizer chose a nested loop join instead of a hash join, and lets you understand the performance of a query. All statistics, except the number of output rows, are cumulative.
We can enable the SQL Trace facility for a session or for an instance.
When the SQL Trace facility is enabled, performance statistics for all SQL statements executed in a user session or in the instance are placed into trace files. The additional overhead of running the SQL Trace facility against an application with performance problems is normally insignificant compared with the inherent overhead caused by the application's inefficiency.
The query optimizer operates in two modes: a normal mode and a tuning mode. The normal mode of the optimizer generates a reasonable execution plan for the vast majority of SQL statements.
Under normal mode, the optimizer operates with very strict time constraints, usually a fraction of a second, during which it must find a good execution plan. The output of the query optimizer is not an execution plan, but a series of actions, along with their rationale and expected benefit for producing a significantly superior plan.
When running in the tuning mode, the optimizer is referred to as the Automatic Tuning Optimizer. The Automatic Tuning Optimizer performs four types of tuning analysis : i.
Statistics Analysis iii. Access Path Analysis iv. If these statistics are stale or missing, the optimizer does not have the necessary information it needs and can generate poor execution plans.
The Automatic Tuning Optimizer checks each query object for missing or stale statistics, and produces two types of output: Recommendations to gather relevant statistics for objects with stale or no statistics.
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Because optimizer statistics are automatically collected and refreshed, this problem may be encountered only when automatic optimizer statistics collection has been turned off. Auxiliary information in the form of statistics for objects with no statistics, and statistic adjustment factor for objects with stale statistics. This auxiliary information is stored in an object called a SQL Profile. Traditionally, users have corrected this problem by manually adding hints to the application code to guide the optimizer into making correct decisions.
Oracle Performance Tuning and Optimization
The query optimizer under normal mode makes estimates about cardinality, selectivity, and cost that can sometimes be off by a significant amount resulting in poor execution plans. Optimizing SQL Code. Chapter 5: Optimizing Sort Operations.
Avoiding sorting in set operations: Chapter 6: Chapter 7: Improving the Oracle Optimizer.
Introducing Adaptive Cursor Sharing for bind variable peeking. Chapter 8: Other Optimizations. Chapter 9: Tuning Memory. Chapter Tuning at the disk level and strategies to distribute Oracle files. Tuning Contention. Authors Ciro Fiorillo.
Ciro Fiorillo is an IT professional and consultant with experience of more than a decade in different roles developer, analyst, DBA, project manager, data and software architect among software industries.
Ciro is currently employed as Lead Software and Data Architect with FinWin Srl, a software house specializing in banking and loans applications. Ciro can be reached at ciro cirofiorillo. Read More. Read More Reviews.
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As a new user, these step-by-step tutorial guides will give you all the practical skills necessary to become competent and efficient. Friendly, informal tutorials that provide a practical introduction using examples, activities, and challenges.
Fast paced, concentrated introductions showing the quickest way to put the tool to work in the real world.This document is not part of your license agreement nor can it be incorporated into any contractual agreement with Oracle or its subsidiaries or affiliates. Technology news, analysis, and tutorials from Packt. My Account. The full server is from Mecca, the certain two have demographic. Sea conductor will go to write for categories.
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