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Oracle Performance Tuning - Read and interpret Explain Plan
 
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Views: 41646 itversity
Oracle SQL Tuning - How to Read Execution Plans (Explain Plan)
 
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In this free tutorial you will learn how to generate and read (interpret) an execution plan in Oracle Databases. See more FREE Oracle Tuning tutorials at http://skillbuilders.com/free-oracle-tutorials. Understanding what the Oracle Database does with your SQL is essential to tuning - and the execution plan is the key. Oracle Certified Master DBA John Watson will provide a brief introduction (4 minutes) - which includes John's tuning methodology, then demonstrate EXPLAIN PLAN, SQL*Plus AUTOTRACE and DBMS_XPLAN.DISPLAY_CURSOR. In the tutorial, John will teach you: - How to read an execution plan - Find the 1st step in the plan - Decipher the order of the steps in the plan - That EXPLAIN PLAN can be very misleading Prerequisites: To get the most from this tutorial, you should: 1 Know how to code SQL 2 Be familiar with SQL*Plus 3 Know - in very general terms - what an execution plan is. 4 Have a basic understanding of the Library Cache (this is where Oracle Database stores parsed SQL statements) 5 Have a basic understanding of the Cost Based Optimizer (this is the part of the database that parses your SQL, creates an execution plan. Hopefully the correct - most efficient - plan).
Views: 66250 SkillBuilders
Oracle SQL Tutorial : Using execution plan to optimize query in oracle
 
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Oracle SQL Tutorial Oracle tutorial: Explain plan for query optimization in Oracle PLSQL oracle tutorial for beginners using execution plan to optimize query sql query analyzer sql query cost analysis https://techquerypond.wordpress.com This oracle tutorial show you how to use EXPLAIN PLAN in oracle. This video covers how to check cost of the query from DBMS_XPLAN.DISPLAY . You can find the cost of the query using the Using EXPLAIN PLAN FOR and based on the result you can optimize the query for faster performance. Subscribe on youtube: https://www.youtube.com/channel/UCpiyAesWNYOXSz5GPq8lbkA For more tutorial please visit #techquerypond https://twitter.com/techquerypond
Views: 13135 Tech Query Pond
Oracle Explain Plan basics
 
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This video gives basic understanding of Oracle Explain plan and will help to understand execution plan terminology.
Views: 15011 amit wadbude
Explaining the Explain Plan: Interpreting Execution Plans for SQL Statements
 
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Presenter: Maria Colgan, Oracle Corporation The execution plan for a SQL statement can often seem complicated and hard to understand. Determining if the execution plan you are looking at is the best plan you could get or attempting to improve a poorly performing execution plan can be a daunting task, even for the most experienced DBA or developer. This session examines the different aspects of an execution plan, from selectivity to parallel execution, and explains what information you should be gleaming from the plan and how it affects the execution. It offers insight into what caused the Optimizer to make the decision it did as well as a set of corrective measures that can be used to improve each aspect of the plan.
Views: 4930 ODTUG
ORACLE EXPLAIN PLAN FUNDAMENTALS
 
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This Tutorial will explain basics of Oracle 11g EXPLAIN Plan by using this ppt & some hands-on in Oracle 11g R2 Database.This tutorial will include below topics. Understanding EXPLAIN plan. Set up & Use EXPLAIN Plan. Explain PLAN_TABLE & related scripts & DBMS_XPLAN.DISPLAY. Generate & View EXPLAIN Plan. Read & Interpret basics of EXPLAIN Plan. EXPLAIN PLAN limitations.
Views: 162820 Anindya Das
Interpreting Oracle Explain Plan Output - John Mullins
 
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Themis Instructor John Mullins presents some details on interpreting Oracle Database Explain Plan output. For more information visit http://www.themisinc.com
Views: 47236 Themis Education
SQL: Explain Plan for knowing the Query performance
 
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In this tutorial, you'll learn how to compare queries to know the better performance query..
Views: 99420 radhikaravikumar
The Basics of Execution Plans and SHOWPLAN in SQL Server
 
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This video is part of LearnItFirst's Transact-SQL Programming: SQL Server 2008/R2 course. More information on this video and course is available here: http://www.learnitfirst.com/Course161 Many of the ideas in this video will be revisited in chapters 5 and 11, so expect mostly basics here - details will come in later videos. Using the query from the last video, trainer Scott Whigham discusses execution plans. How can you uncover the steps SQL Server went through to arrive at the results? What is SHOWPLAN? Highlights from this video: - What does the execution plan tell us? - How can you look at the execution plan? - Estimated Execution Plan vs. Actual Execution Plan - How does SQL Server choose indexes? - Analyzing and understanding graphical execution plans - Determining costs of the components of execution - Using SHOWPLAN and much more...
Views: 86432 LearnItFirst.com
Query Tuning 101: How to Compare Execution Plans
 
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When you're tuning SQL query there's two important questions to keep in mind: * Have my changes made any difference? * If they have, is performance better or worse? In this video we'll look at how you can use SQL Developer to compare execution plans. This will enable you to differences between them and determine which plan performs better. ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 15344 The Magic of SQL
Access vs. Filter in SQL Execution Plans | Chris Saxon
 
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Chris Saxon, an SQL Developer Advocate with Oracle, takes to his kitchen to explain the differences between access and filter in an SQL execution plan.
Views: 678 ArchBeat Archive
Query Tuning 101: Access vs. Filter Predicates In Execution Plans
 
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Have you ever wondered what the difference is between the "filter predicates" or "access predicates" steps listed in execution plans - or even what a predicate is? If so, watch this video to find out! Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 5074 The Magic of SQL
Index and Execution Plan basics
 
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More at: https://dallasdbas.com/blog Index tuning and Execution Plan basics for Developers and New DBAs
Views: 404 Kevin Hill
Understanding The Execution Plan - Part 1
 
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Topic: Understanding The Execution Plan In this video (part-1) I have explained - The basics of Oracle Execution Plan - How an Execution Plan Looks from SQL Developer, SQL*Plus - How to use Oracle Explain Plan command - Where else one can find Oracle's Execution Plan apart from PLAN_TABLE - Some Examples of Execution Plan - Using DBMS_XPLAN package to format the output while printing the Execution Plan
Views: 6522 Satish Lodam
Slow SQL Query? Get the Plan in Oracle SQL Developer!
 
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See how to get execution and explain plans, format and views those plans, use AutoTrace, and Real Time SQL Monitoring for your SQL queries in Oracle SQL Developer.
Views: 3035 Jeff Smith
Ways of generating EXECUTION PLAN in Oracle Database
 
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Learn how to generate execution plan in oracle database in many ways
Views: 3610 OrSkl Academy
05 04 Reading an Execution Plan
 
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ORACLE
Views: 550 oracle ocm
Oracle Database 12c: Adaptive Execution Plans with Tom Kyte
 
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Tom Kyte introduces adaptive execution plans followed by a demo. "Adaptive Plans" in SQL Tuning Guide" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=TGSQL221 "Controlling Adaptive Optimization" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=TGSQL257 "Generating and Displaying SQL Execution Plans" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=TGSQL271 "Keeping Your Database Secure" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=DBSEG009
Views: 14107 OracleDBVision
Using DBMS_XPLAN.DISPLAY_CURSOR to examine execution plans
 
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In this video I describe how you can use Oracle's DBMS_XPLAN.DISPLAY_CURSOR to examine the execution plan for a SQL statement that has recently been executed and determine if that plan is optimal or not and where you might be able to optimize it.
Views: 9787 Maria Colgan
22 Basic Execution Plans
 
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SQL Server 2012 Administration Essentials SQL Server 2014
Oracle SQL Tuning - Oracle Execution Plans for Beginners
 
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For More Tutorials Related To Cisco,CCNA,Microsoft,Oracle,HP,Adobe,IBM,Java And Much More Please Visit This Site http://www.geteveryvideos.com/category/certification-tutorials/
SQL Server Query Plan Analysis: The 5 Culprits That Cause 95% of Your Performance Headache
 
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Ever open a huge query plan to track down a performance issue and instead find yourself overwhelmed by the sheer number of objects on the screen? How do you figure out which part of the plan.
Views: 4512 Fidela Aretha
SQL Server Execution Plan Operators
 
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Table scans, clustered index scans, merge joins, sorts, and more.
Views: 33065 Brent Ozar Unlimited
Influencing Oracle SQL Execution Plans
 
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Themis instructor John Mullins discusses Oracle SQL Execution plans and how you can influence them for better SQL performance.
Views: 1924 Themis Education
EXPLAIN PLAN for multiple SQL statements
 
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How to generate Oracle database explain plan for number of SQL statements at the same time.
Views: 2310 OrSkl Academy
Oracle Parallel Execution Plans Deep Dive
 
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A presentation about understanding the essentials of Oracle Parallel Execution and how to read the corresponding execution plans
Views: 3109 Randolf Geist
Oracle Performance Tuning - Generate Explain Plan
 
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Views: 8817 itversity
Oracle SQL Tuning - How to Read Execution Plan Part 1
 
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Learn how to tune SQL. If you're going to tune Oracle SQL statements, you will need to learn how to read an execution plan! See all Free lessons in this tutorial at http://www.skillbuilders.com/sql-tuning-for-beginners-free-tutorial .
Views: 2282 SkillBuilders
Introduction to Execution Plan
 
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Get the complete course on SQL Tuning(Regular price $199) for only $10 https://www.udemy.com/sql-tuning/?couponCode=UDEYOU
Views: 430 Oracle Training
Oracle Explain Plan
 
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Oracle SQL Executions: Explain Plan and Execution Plan A simple introduction with a single table example
Views: 995 Hemant K Chitale
Oracle SQL Performance Tuning for Developers: Understand Explain Plans
 
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Understanding Explain Plans is an excerpt from Oracle SQL Performance Tuning for Developers: http://www.informit.com/store/oracle-sql-performance-tuning-for-developers-livelessons-9780134117027 6+ Hours of Video Instruction The focus of Oracle SQL Performance Tuning for Developers LiveLessons is to illustrate coding techniques that ensure a consistent response time between instances and releases of the Oracle database. This course works closely with performance tuning of actual SQL statements. Description In this video training, Dan Hotka starts out with a complete overview of the Oracle architecture so students can get an understanding how their SQL and applications can take advantage of the computing environment. This course then goes in-depth on understanding and controlling the Explain Plan, which is how and in what order Oracle retrieves data. The discussion includes considerable detail, with SQL examples, on how the optimizers--both rule-based and cost-based, but mostly cost-based--make their decisions. Students will work with a variety of SQL statements, reviewing Explain Plans and making changes to make these SQL statements perform better. Lectures include index design, using hints and coding style to control the Explain Plans, and how to use useful tools such as index monitoring, SQL Trace, and the PL/SQL profiler. This LiveLessons course takes a close look at indexes: how Oracle selects them, why they are sometimes not used, and how to tell if indexes are being used. This course includes Oracle10g, Oracle11g, and Oracle12c SQL tuning topics. Skill Level Intermediate Learn How To Read and understand Explain Plan content Review an Explain Plan and tell quickly if this is a good plan Understand a good index column candidate from a not-so-good candidate Quickly tell the likelihood if your SQL will use an existing index Use coding and a variety of Hints (directives) that can produce better performing SQL Execute and interpret SQL trace output Who Should Take This Course Oracle programmers Oracle database administrators who need additional training on SQL tuning Course Requirements Working knowledge of the SQL query language http://www.informit.com/store/oracle-sql-performance-tuning-for-developers-livelessons-9780134117027
Views: 3428 LiveLessons
Execution Plan Example 2
 
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Get the complete course on SQL Tuning(Regular price $199) for only $10 https://www.udemy.com/sql-tuning/?couponCode=UDEYOU
Views: 569 Oracle Training
Calculate query performance with Explain Plan in Oracle PLSQL.
 
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Explain plan is a wonderful utility in Oracle PL SQL. It helps you to understand how much cost a query takes to perform based on indexed table or table without index. In this oracle tutorial a full description is given on a table containing huge number of rows first based on index on a column and then without index.
Views: 3789 Subhroneel Ganguly
Execution Plan Example 4
 
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Get the complete course on SQL Tuning(Regular price $199) for only $10 https://www.udemy.com/sql-tuning/?couponCode=UDEYOU
Views: 2339 Oracle Training
Part 1 Execution Plans in SQL Server
 
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Video talks about Execution Plans in SQL Server show Execution Plans in SQL Server sql execution sql show plan Step by step SQL Training videos SQL Tutorial
Views: 5734 Training2SQL MSBI
Obtaining Execution Plan in Oracle
 
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Obtaining Execution Plan in Oracle with demostration.
Views: 362 Expert-Oracle.com
Oracle SQL Tuning - Explain Plan Lies?
 
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Do you use EXPLAIN PLAN to tune Oracle SQL? Does it always "tell the truth", or does it "lie". (Maybe it's not the whole truth!) In this free tutorial from SkillBuilders' Oracle Certified Master John Watson, you will learn why the execution plan generated by EXPLAIN PLAN can be misleading and what to do about it. After a brief lecture, John demonstrates exactly why. You'll hear about dynamic sampling, adaptive cursor sharing (11g), adaptive execution plans (12c) and of course, bind variables. John demonstrates how bind variables cause misleading execution plans using dbms_xplan.display and dbms_xplan.display_cursor. To get the most from this tutorial, you should have some understanding of hard parse, soft parse, cardinality, histograms. See all SkillBuilders FREE Oracle Database tutorials at http://www.skillbuilders.com/free-oracle-tutorials.
Views: 3485 SkillBuilders
SELECT statement Processing in an Oracle Database - DBArch  Video 7
 
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You will learn from this video how a SELECT statement is processed in an Oracle Database. You will learn about the a Parse, Execute and Fetch phases in a select statement. Our Upcoming Online Course Schedule is available in the url below https://docs.google.com/spreadsheets/d/1qKpKf32Zn_SSvbeDblv2UCjvtHIS1ad2_VXHh2m08yY/edit#gid=0 Reach us at [email protected]
Views: 31766 Ramkumar Swaminathan
Why Did Your SQL Execution Plan Change? | Alfredo Krieg
 
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Oracle ACE Alfredo Krieg offers advice on tools for improving database performance in this 2 Minute Tech Tip recorded at the 2016 Great Lakes Oracle Conference in Cleveland, OH.
Views: 330 ArchBeat Archive
SQL Tuning for Beginners 8 How to Read Execution Plan Part 2
 
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Learn how to tune Oracle SQL statements! You'll need to know how to read an execution plan. See all FREE lessons http://www.skillbuilders.com/sql-tuning-for-beginners-free-tutorial
Views: 806 SkillBuilders
Oracle 12c SQL Tuning - Adaptive Execution Plans
 
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Learn an Oracle Database 12c new performance feature - Adaptive SQL Plans. During execution, Oracle Database can switch the SQL to a new plan. A very powerful corrective measure! But if you don't know about it , how can you possibly tune SQL in Oracle Database 12c? Time to learn 12c!
Views: 5568 SkillBuilders
SQL запрос EXPLAIN и EXPLAIN QUERY PLAN в базах данных SQLite: оптимизация SQL запросов.
 
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Помощь проекту: WMR: R288272666982 WMZ: Z293550531456 Яндекс.Деньги: 410011531129223 Рубрика SQLite на сайте: http://zametkinapolyah.ru/zametki-o-mysql/sqlite/ Паблик блога в ВК: https://vk.com/zametkinapolyah Тематическая группа в ВК: https://vk.com/zametki_bd -- SQL запрос EXPLAIN в базах данных SQLite: оптимизация SQL запросов. -- Эти ссылки помогут вам разобраться с оптимизацией запросов: http://sqlite.org/lang_explain.html http://sqlite.org/optoverview.html http://sqlite.org/eqp.html http://sqlite.org/queryplanner.html http://sqlite.org/queryplanner-ng.html http://sqlite.org/opcode.html /* Библиотека SQLite имеет две SQL команды, которые позволяют нам сделать две важные вещи: посмотреть как выполняется запрос и оценить насколько он эффективен. Эти SQL команды стоит использовать только при отладке, но никак не в рабочих проектах. Команды, на самом деле очень просты: EXPLAIN и EXPLAIN QUERY PLAN. Информация, получаемая при помощи запросов EXPLAIN и EXPLAIN QUERY PLAN может изменяться в зависимости от версии SQLite. Запрос EXPLAIN позволяет увидеть последовательность машинных команд, которые бы совершила SQLite для выполнения того или иного запроса. У SQLite есть целый раздел документации, в котором описывается особенность использования EXPLAIN QUERY PLAN, там даже есть наглядные примеры и детальные пояснения. */ EXPLAIN SELECT * FROM invoices WHERE BillingCountry = "USA"; /* addr - номер команды или инструкции, всегда начинается с нуля P1, P2 P3 - 32-ух битные целые числа, зачастую эти операнды ссылаются на регистры для получения инструкций по работе с Б-деревом. P3 - обычно используется для хранения промежуточных результатов. P1 - обычно хранит в себе номер указателя текущего узла Б-дерева или курсор. P2 - хранит информацию, которая помогает перемещаться между узлами дерева, обычно это узел, в который нужно перейти. P4 - может быть как 32-ух битным целым, так и 64-ех битным целым или 64-ех битным с плавающей точкой, BLOB или строковым значением обычно этот операнд является указателем на функцию сравнения данных. P5 - значение данного операнда является флагом, который может тем или иным образом влиять не результаты выполнения операций (всё зависит от opcode). opcode - это код машинной операции, которая выполняется на том или ином шагу. Не все операции задействуют одинаковое число операндов, а назначение некоторых операндов зависит от выполняемой операции. */ -- EXPLAIN QUERY PLAN -- для тблицы без индекса SELECT * FROM invoices WHERE BillingCountry = "USA"; EXPLAIN QUERY PLAN SELECT * FROM invoices WHERE BillingCountry = "USA"; -- для таблицы с индексом SELECT * FROM invoices WHERE BillingCountry = "USA"; EXPLAIN QUERY PLAN SELECT * FROM invoices WHERE BillingCountry = "USA"; -- поиск по индексному столбцу SELECT BillingCountry FROM invoices WHERE BillingCountry = "USA"; EXPLAIN QUERY PLAN SELECT BillingCountry FROM invoices WHERE BillingCountry = "USA"; -- поиск с группировкой DROP INDEX i1; SELECT max(invoicedate), BillingCountry FROM invoices GROUP BY BillingCountry; EXPLAIN QUERY PLAN SELECT max(invoicedate), BillingCountry FROM invoices GROUP BY BillingCountry; /* explain query plan scan table — самый тупой поиск в базе даннных, полнотекстовый перебор значений; search table using index — индекс в таблице существует, но данные, которые мы ищем в него не включены; search table using covering index — самый эффективный случай, искомые данные уже лежат в индексе; use temp B-TREE — поиск с конструкциями типа group by, order by, и по столбцу, в котором идет поиск, индекс не создан, в этом случае SQLite делает примерно следующее: выбирает все строки, которые удовлетворяют заданному критерию, а затем строит в памяти Б-дерево, которое использует для сортировки этих данных, всё это происходит очень медленно. Поэтому столбцы, значения которых в часто группируете или сортируете лучше проиндексировать. */
Execution Plan Example 1
 
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Get the complete course on SQL Tuning(Regular price $199) for only $10 https://www.udemy.com/sql-tuning/?couponCode=UDEYOU
Views: 882 Oracle Training
Four Steps to Oracle SQL Tuning  - A Methodolgy
 
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Learn a predictable and repeatable methodology for tuning Oracle SQL statements. Just four steps that you should always follow when tuning an SQL statement. (Note this video does not contain examples of how to apply the four steps, just what the steps are.) Oracle Certified Master John Watson presents. John concludes with a brief overview of how SkillBuilders SQL tuning course provides the information you need to apply the four steps. Learn more about SkillBuilders SQL Tuning course http://skillbuilders.com/oracle-sql-tuning-training 1. What is Oracle doing? (explain plan, trace) 2. Why is Oracle doing it that way? (analyze the execution plan) 3. Is there a better way? Test! 4. If there's a better way, push the CBO towards the better way.
Views: 13651 SkillBuilders
Oracle SQL Tuning Re-Optimizing Execution Plans with Cardinality Feedback
 
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Cardinality feedback, introduced with Oracle Database 11g, has been significantly enhanced with 12c. Cardinality feedback allows the CBO to learn from a cardinality estimate mistake and re-optimize the execution plan. Learn more in this free SQL Tuning tutorial. See all free Oracle Database tutorials at http://www.skillbuilders.com/free-oracle-tutorials.
Views: 3185 SkillBuilders
2014 11 03 12 15 Oracle Lunch n Learn Explain Plan Syntax
 
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Oracle Explain Plan content including Plan_Table setup, SQL*Plus and bind variables, and newer DBMS_XPLAN syntax.
Views: 3112 Dan Hotka
Query Tuning 101 How to Run Autotrace in SQL Developer
 
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This video shows how to run autotrace reports using Oracle SQL Developer to analyze query performance. It also discusses the privileges you need to enable database users to run autotrace. ============================ The Magic of SQL with Chris Saxon Copyright © 2015 Oracle and/or its affiliates. Oracle is a registered trademark of Oracle and/or its affiliates. All rights reserved. Other names may be registered trademarks of their respective owners. Oracle disclaims any warranties or representations as to the accuracy or completeness of this recording, demonstration, and/or written materials (the “Materials”). The Materials are provided “as is” without any warranty of any kind, either express or implied, including without limitation warranties or merchantability, fitness for a particular purpose, and non-infringement.
Views: 19555 The Magic of SQL