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Oracle Sql Performance Tuning And Optimization

Author: Kevin Meade
Publisher: CreateSpace
ISBN: 9781501022692
Size: 31.61 MB
Format: PDF, Docs
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Written by a Senior Database Administrator who has worked with the Oracle RDBMS for thirty years, this is a book which teaches the skill of SQL Tuning for the Oracle Database. Not a list of one-off tricks or tips, nor a glossing over of topics; this book offers an in-depth process covering discovery, analysis, and problem resolution. Learn the science behind SQL Tuning. Learn and apply the FILTERED ROWS PERCENTAGE Cardinality based method of tuning Determine a query's Driving Table and Join Order Construct Query Diagrams, Data Models, and Join Trees Build and use Count / Filter / and Reconstruction Queries Identify Waste in a Query Execution Plan Zero in on Cardinality Divergence using Estimated vs. Actuals Use the ACCESS / FILTER / COVERAGE strategy to build indexes for Problem Queries Exploit THE 2% RULE in analyzing Access method and Join method Classify queries as Precision Style or Warehouse Style Understand Hash Join mechanics and make Hash Joins go faster Make HINTS work as Detection Tools rather than clubs Avoid early Database Design flaws Manage Statistics and deal with common Statistics problems (NDV, Uniform Distribution, Independence, Dynamic Sampling) (Staleness, Skew, Dependence, Defaulting, Out-Of-Bounds, Transiency, Bloat) Perfect your Question Based Analyis Technique and more Included are: a special chapter for EXADATA, a LAB which demonstrates the cardinality based process of SQL Tuning, and twenty three magical SQL scripts that make the process of SQL Tuning easy to do. Learn the skill of SQL Tuning as taught by an expert who does it for a living, and become the go-to specialist in your company. Chapter 1: DRIVING TABLE and JOIN ORDER Chapter 2: Ways to Use a Query Execution Plan Chapter 3: The Best Indexes for a Query Chapter 4: JOINS Chapter 5: HINTS Chapter 6: BASICS Chapter 7: ROW COUNTS and RUN TIMES Chapter 8: EXADATA LAB: Reverse Engineering the QEP Appendix: Know Your Scripts Scripts for analyzing queries and plans Scripts for examining an active database Scripts for looking at metadata showplan showplanshort showplanconstraints showplancountqueries showplandatamodel showplandrivingtable showplanfilterqueries showplanfrpspreadsheetcode showplanindexes showplannumrows showplanquerydiagram showplantables showplantablesunique loadplanfromcache loadplanfromhist showtopcpu showowner showindexes showconstraints showcolstats showhistograms showallscanrates showallworkareas It's all about the Cardinalities

Performance Tuning F R Oracle Datenbanken

Author: Leonid Nossov
Publisher: Springer-Verlag
ISBN: 3642330533
Size: 43.22 MB
Format: PDF, ePub
View: 6998
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Stellen Sie sich vor, Ihre Datenbank lahmt plötzlich oder steht gar. Es kann auch sein, dass einige Anwendungsteile zu langsam sind, und Sie wissen nicht, warum. Wie klärt man die Ursache schlechter Performance und wie beseitigt man sie am effektivsten? Welche Möglichkeiten bietet Oracle? Welche anderen nicht oder nur spärlich beschriebenen Methoden und Tricks kann man anwenden, damit Ihre Datenbank wieder richtig „tickt“? Aus diesem Blickwinkel betrachtet der Autor diverse Oracle-Features. Sie sind auch mit Test-Cases versehen, so dass der Leser selbst deren „Tiefen“ untersuchen kann. Da „machs-wie-ich“ eine der besten Lehrmethoden ist, sind zahlreiche Fälle im Buch präsentiert, die direkt für die Praxis umsetzbar sind. Die begleitende Webseite bietet Test-Cases für einige Features sowie SQL- und PLSQL-Skripte für Performance Tuning.

Formales Sql Tuning F R Oracle Datenbanken

Author: Leonid Nossov
Publisher: Springer-Verlag
ISBN: 3662452928
Size: 23.16 MB
Format: PDF, ePub
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Das Ziel des SQL-Tunings ist eine Verbesserung des bestehenden Ausführungsplans. Die in diesem Buch beschriebene Methode kann man „Bremsenbeseitigung im Ausführungsplan“ nennen. Solche „Bremsen“ oder Engpässe lassen sich durch eine formale Analyse des Ausführungsplans erkennen. Dafür sind keine Datenmodellkentnisse notwendig. Das ist besonders vorteilhaft für Datenbankadministratoren, weil sie in der Regel gar nicht oder unzureichend gut mit dem Datenmodell vertraut sind. Im Buch werden zahlreiche praktische Erfahrungen mit dieser Methode präsentiert.

Formal Sql Tuning For Oracle Databases

Author: Leonid Nossov
Publisher: Springer
ISBN: 3662504170
Size: 50.85 MB
Format: PDF, Mobi
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The target of SQL tuning is the improvement of the existing execution plan. The authors discuss the removal of brakes in the execution plan. Such "brakes" or bottlenecks can be recognized by a formal analysis of the execution plan. For this purpose no data model knowledge is needed. This is especially beneficial for database administrators because they are usually not or insufficiently familiar with the data model. The book presents numerous practical examples with this method.

Relational Database Design And Implementation

Author: Jan L. Harrington
Publisher: Morgan Kaufmann
ISBN: 0128499028
Size: 35.58 MB
Format: PDF, Mobi
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Relational Database Design and Implementation: Clearly Explained, Fourth Edition, provides the conceptual and practical information necessary to develop a database design and management scheme that ensures data accuracy and user satisfaction while optimizing performance. Database systems underlie the large majority of business information systems. Most of those in use today are based on the relational data model, a way of representing data and data relationships using only two-dimensional tables. This book covers relational database theory as well as providing a solid introduction to SQL, the international standard for the relational database data manipulation language. The book begins by reviewing basic concepts of databases and database design, then turns to creating, populating, and retrieving data using SQL. Topics such as the relational data model, normalization, data entities, and Codd's Rules (and why they are important) are covered clearly and concisely. In addition, the book looks at the impact of big data on relational databases and the option of using NoSQL databases for that purpose. Features updated and expanded coverage of SQL and new material on big data, cloud computing, and object-relational databases Presents design approaches that ensure data accuracy and consistency and help boost performance Includes three case studies, each illustrating a different database design challenge Reviews the basic concepts of databases and database design, then turns to creating, populating, and retrieving data using SQL

Oracle Sql Tuning With Oracle Sqltxplain

Author: Stelios Charalambides
Publisher: Apress
ISBN: 1430248106
Size: 79.28 MB
Format: PDF, Mobi
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Oracle SQL Tuning with SQLTXPLAIN is a practical guide to SQL tuning the way Oracle's own experts do it, using a freely downloadable tool called SQLTXPLAIN. Using this simple tool you'll learn how to tune even the most complex SQL, and you'll learn to do it quickly, without the huge learning curve usually associated with tuning as a whole. Firmly based in real world problems, this book helps you reclaim system resources and avoid the most common bottleneck in overall performance, badly tuned SQL. You'll learn how the optimizer works, how to take advantage of its latest features, and when it's better to turn them off. Quickly tune any SQL statement no matter how complex. Build and tune test cases without affecting production. Use the latest tuning features with confidence.

Expert Oracle Sql

Author: Tony Hasler
Publisher: Apress
ISBN: 1430259787
Size: 77.38 MB
Format: PDF
View: 7132
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Expert Oracle SQL: Optimization, Deployment, and Statistics is about optimizing individual SQL statements, especially on production database systems. This Oracle-specific book begins by assuming you have already identified a particular SQL statement and are considering taking steps to improve its performance. The book describes a systematic process by which to diagnose a problem statement, identify a fix, and to implement that fix safely in a production system. You'll learn not only to improve performance when it is too slow, but also to stabilize performance when it is too variable. You'll learn about system statistics and how the Cost-Based Optimizer uses them to determine a suitable execution plan for a given statement. That knowledge provides the foundation from which to identify the root cause, and to stabilize and improve performance. Next after identifying a problem and the underlying root cause is to put in place a solution. Expert Oracle SQL: Optimization, Deployment, and Statistics explains how to apply various remedies such as changing the SQL statement, adding hints, changing the physical design, and more, and how they can be brought to bear on fixing a problem once and for all. Rolling a change out smoothly is an important topic when dealing with tuning and optimization. Expert Oracle SQL: Optimization, Deployment, and Statistics does not let you down in this critical area. The book contains two chapters of good information from an experienced professional on how to safely deploy changes into production so that your systems remaining running and available throughout the deployment process. Describes a systematic approach to tuning Oracle SQL Explains how things are supposed to work, what can go wrong, and how to fix it Takes you through the steps needed to stabilize performance in your production systems