Tuning of SQL code is generally cheaper than changing the data model. Physical and configuration tuning involves a search for bottlenecks that often points to SQL code or data model issues. Building an appropriate data model and writing properly performing SQL code can give 100%+ performance improvement. Physical and configuration tuning often gives at most a 25% performance increase.

Цикл видео уроков Oracle и SQL, от Дмитрия Пушкашу. Вам расскажут о компонентах архитектуры, покажут и разберут на конкретных примерах серию наиважнейших функций и многое другое. Видео курс рассчитан, как на новичков так и на более опытных пользователей.

Troubleshoot, tune, and optimize your Oracle database efficiently and successfully every time. This book explains how to take full advantage of the revolutionary Oracle Wait Interface to quickly pinpoint--and solve--core problems and bottlenecks, and increase productivity exponentially.

Monitor, analyze, and optimize Oracle Database 10g using the tested methods and insider advice contained in this definitive volume. Written by Oracle Certified Master Richard Niemiec, Oracle Database 10g Performance Tuning Tips & Techniques is packed with detailed case studies, best practices, and code samples illustrating Oracle's new tuning features. Find out how to select optimal indexing options, effectively manage drives and disk arrays, troubleshoot queries, and reliably predict future performance. You'll also get detailed coverage of PL/SQL performance enhancements, initialization file tweaks, and the latest database surveying and reporting utilities.

Oracle Database 10g Insider Solutions is a must-have reference guide for all Oracle professionals. It provides much-needed information on best practices, tips, and techniques in debugging, installation, deployment, and tuning of the Oracle 10g database. You can draw upon the experience and knowledge of these authors to find creative ways to put your Oracle database to work. The authors will also address common and not-so-common installation concerns, database administration, development, and tuning. Oracle Database 10g Insider Solutions will bring you the insider information that you can't get anywhere else.

The question, "Why isn't Oracle using my index?" must be one of the most popular (or perhaps unpopular) questions ever asked on the Oracle help forums. You've picked exactly the right columns, you've got them in the ideal order, you've computed statistics, you've checked for null columnsand the optimizer flatly refuses to use your index unless you hint it. What could possibly be going wrong?

If you've suffered the frustration of watching the optimizer do something completely bizarre when the best execution plan is totally obvious, or spent hours or days trying to make the optimizer do what you want it to do, then this is the book you need. Youll come to know how the optimizer “thinks,” understand why it makes mistakes, and recognize the data patterns that make it go awry. With this information at your fingertips, you will save an enormous amount of time on designing and trouble-shooting your SQL.

The cost-based optimizer is simply a piece of code that contains a model of how Oracle databases work. By applying this model to the statistics about your data, the optimizer tries to efficiently convert your query into an executable plan. Unfortunately, the model can't be perfect, your statistics can't be perfect, and the resulting execution plan may be far from perfect.

In Cost-Based Oracle Fundamentals, the first book in a series of three, Jonathan Lewisone of the foremost authorities in this fielddescribes the most commonly used parts of the model, what the optimizer does with your statistics, and why things go wrong. With this information, youll be in a position to fix entire problem areas, not just single SQL statements, by adjusting the model or creating more truthful statistics.

Secrets of the Oracle Database is the definitive guide to undocumented and partially documented features of the Oracle database server. Covering useful but little–known features from Oracle9i Database through Oracle Database 11g, this book will improve your efficiency as an Oracle database administrator or developer. Norbert Debes shines the light of day on features that help you master more difficult administrative, tuning, and troubleshooting tasks than you ever thought possible.

Finally, in one place, you have at your fingertips knowledge that previously had to be acquired through years of experience and word of mouth through knowing the right people. What Norbert writes is accurate, well–tested, well–illustrated by clear examples, and sure to improve your ability to make an impact in your day–to–day work with Oracle.

What you’ll learn

* Take advantage of Oracle’s built–in Perl DBI distribution to write applications for monitoring, benchmarking, data extraction, and more.
* Interpret the undocumented, extended trace file format to pinpoint performance problems that TKPROF reports overlook and obscure.
* Get the most out of Statspack by using undocumented report formatting options, accessing its scarcely–documented repository, and integrating with SQL Trace.
* Take control of your instance through the ill–documented ORADEBUG command, enabling you to control processes, trace SQL statements, dump process state, monitor wait events and the call stack, and much more.
* Leverage undocumented features in Oracle’s built–in scheduler to better automate your workload.
* Take full advantage of Transparent Application Failover and Cluster Database Services in a Real Application Cluster environment.

From smaller businesses through to huge enterprises – users all over the world often require access to data 24 hours a day. Distributed database systems proliferate the world of data sharing providing an ability to access real-time data anywhere, anytime. Oracle Streams, a built-in feature of the Oracle database, is a data replication and integration feature critical to the success and wellbeing of enterprises in today's fast moving economy. This book provides the reader with solid techniques to master Oracle Streams technology and successfully deploy distributed database systems.

This book quickly goes over the basics and gets you up and running with a simple Oracle 11g Streams environment. It will serve as an excellent companion to the Oracle Streams Administration Guide. It is intended for Oracle database architects and administrators, and provides in-depth discussion on must-know information for the design, implementation, and maintenance of an Oracle Streams environment.

The book does not attempt to regurgitate all the information in the Oracle Streams Administration Guides, but rather provides additional clarification and explanation of design, implementation, and troubleshooting concepts that are often elusive in Streams documentation. It also identifies helpful tools and Oracle resources to add to your knowledge base, as well as tried and tested tricks and tips to help you tame Oracle Streams.

The book starts by introducing and explaining the components of Oracle Streams and how they work together. It then moves on logically, helping you to determine your distributed environment requirements and design your Streams implementation to meet those requirements. Once these concepts are discussed, the book moves to configuration and basic implementation examples to help solidify those concepts. It then addresses advanced features such as tags, down-stream capture, and conflict resolution. You then move on to maintenance techniques such as documenting the environment, effectively planning and implementing changes to the environment, and monitoring and troubleshooting the environment. When you have studied the techniques and completed the hands-on examples, you will have an understanding of Oracle Streams' core concepts and functionally that will allow you to successfully design, implement, and maintain an Oracle Streamed environment.

This book is an anthology of effective database management techniques representing the collective wisdom of the OakTable Network. With an emphasis upon performance—but also branching into security, national language, and other issues—the book helps you deliver the most value for your company’s investment in Oracle Database technologies. You’ll learn to effectively plan for and monitor performance, to troubleshoot systematically when things go wrong, and to manage your database rather than letting it manage you.

* Rigorous and peer-reviewed content from the OakTable Network of Oracle scientists
* Strong emphasis upon managing for high performance
* Lays a strong foundation for advancing in the DBA profession

Beginning Oracle SQL is your introduction to the interactive query tools and specific dialect of SQL used with Oracle Database. The book is a revision of the classic Mastering Oracle SQL and SQL*Plus by Lex de Haan, and has been updated to cover the very latest developments in Oracle’s version of the SQL query language. Written in an easygoing and example-based style, Beginning Oracle SQL is the book that will get you started down the path to successfully writing SQL statements and getting results from Oracle Database.

* Takes an example-based approach, with clear and authoritative explanations
* Introduces both SQL and the query tools used to execute SQL statements
* Shows how to create tables, populate them with data, and then query that data to generate business results
What you’ll learn
* Create database tables and define their relationships
* Add data to your tables; change and delete that data
* Write database queries that generate accurate results
* Avoid common traps and pitfalls in writing SQL queries
* Take advantage of advanced Oracle SQL features such as support for hierarchical queries, analytic and window functions, flashback to a given point in time, and more
* Get a handle on Oracle Database’s support for object types in the database