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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: 63268 SkillBuilders
Oracle Performance Tuning - Read and interpret Explain Plan
 
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Connect with me or follow me at https://www.linkedin.com/in/durga0gadiraju https://www.facebook.com/itversity https://github.com/dgadiraju https://www.youtube.com/c/TechnologyMentor https://twitter.com/itversity
Views: 37374 itversity
Oracle tutorial : Using execution plan to optimize query in oracle
 
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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: 9685 Tech Query Pond
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: 159419 Anindya Das
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: 3609 ODTUG
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: 94219 radhikaravikumar
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: 12983 amit wadbude
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: 2054 Jeff Smith
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: 44295 Themis Education
SQL Tuning: Lấy Execution plan từ câu Query hoặc từ SQL_ID
 
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In ra execution plan: - Từ câu query. - Sử dung câu lệnh: EXPLAIN PLAN FOR - SET AUTOTRACE trên SQLPLUS - Lấy Excution Plan từ SQL_ID
Views: 5550 Database Tutorials
How to auto-optimize SQL code with Toad for Oracle Xpert Edition
 
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http://www.DellSoftware.com/Toad-for-Oracle This video shows how to auto-optimize SQL code with Toad for Oracle Xpert Edition from Dell Software.
Views: 6785 DellTechCenter
sql query optimization by using SQL server query execution plan
 
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SQL server query execution plan- sql query optimization by using SQL server query execution plan
Loading plans in SQL Baselines in Oracle
 
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Loading plans in SQL Baselines
Views: 2781 Apps Core
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: 3297 SkillBuilders
Oracle SQL Developer - Comparing SQL Execution Plans
 
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This is a short video about a feature in SQL Developer which alllow any DBA or developer to compare different execution plans of a SQL Statement. My Blog: https://navneetupnejadba.wordpress.com/ Slideshare: https://www.slideshare.net/navneetupneja1/sql-developer-powerful-free-tool-for-developers-and-dbas
Views: 197 Navneet Upneja
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: 14429 The Magic of SQL
Oracle SQL Developer: Query Builder Demo
 
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How to build queries with your mouse versus the keyboard.
Views: 69594 Jeff Smith
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 cache
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache.html Slides http://csharp-video-tutorials.blogspot.com/2017/04/sql-server-query-plan-cache_12.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All SQL Server Tutorial Videos https://www.youtube.com/playlist?list=PL08903FB7ACA1C2FB All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss 1. What happens when a query is issued to SQL Server 2. How to check what is in SQL Server plan cache 3. Things to consider to promote query plan reusability What happens when a query is issued to SQL Server In SQl Server, every query requires a query plan before it is executed. When you run a query the first time, the query gets compiled and a query plan is generated. This query plan is then saved in sql server query plan cache. Next time when we run the same query, the cached query plan is reused. This means sql server does not have to create the plan again for that same query. So reusing a query plan can increase the performance. How long the query plan stays in the plan cache depends on how often the plan is reused besides other factors. The more often the plan is reused the longer it stays in the plan cache. How to check what is in SQL Server plan cache SELECT cp.usecounts, cp.cacheobjtype, cp.objtype, st.text, qp.query_plan FROM sys.dm_exec_cached_plans AS cp CROSS APPLY sys.dm_exec_sql_text(plan_handle) AS st CROSS APPLY sys.dm_exec_query_plan(plan_handle) AS qp ORDER BY cp.usecounts DESC As you can see we have sorted the result set by usecounts column in descending order, so we can see the most frequently reused query plans on the top. usecounts - Number of times the plan is reused objtype - Specifies the type of object text - Text of the SQL query query_plan - Query execution plan in XML format To remove all elements from the plan cache use the following command DBCC FREEPROCCACHE In older versions of SQL Server up to SQL Server 6.5 only stored procedure plans are cached. The query plans for Adhoc sql statements or dynamic sql statements are not cached, so they get compiled every time. With SQL Server 7, and later versions the query plans for Adhoc sql statements and dynamic sql statements are also cached. Things to consider to promote query plan reusability For example, when we execute the following query the first time. The query is compiled, a plan is created and put in the cache. Select * From Employees Where FirstName = 'Mark' When we execute the same query again, it looks up the plan cache, and if a plan is available, it reuses the existing plan instead of creating the plan again which can improve the performance of the query. However, one important thing to keep in mind is that, the cache lookup is by a hash value computed from the query text. If the query text changes even slightly, sql server will not be able to reuse the existing plan. For example, even if you include an extra space somewhere in the query or you change the case, the query text hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. Another example : If you want the same query to find an employee whose FirstName is Steve instead of Mark. You would issue the following query Select * From Employees Where FirstName = 'Steve' Even in this case, since the query text has changed the hash will not match, and sql server will not be able find the plan in cache and ends up compiling the query again and creating a new plan. This is why, it is very important to use parameterised queries for sql server to be able to reuse cached query plans. With parameterised queries, sql server will not treat parameter values as part of the query text. So when you change the parameters values, sql server can still reuse the cached query plan. The following query uses parameters. So even if you change parameter values, the same query plan is reused. Declare @FirstName nvarchar(50) Set @FirstName = 'Steve' Execute sp_executesql N'Select * from Employees where [email protected]', N'@FN nvarchar(50)', @FirstName One important thing to keep in mind is that, when you have dynamic sql in a stored procedure, the query plan for the stored procedure does not include the dynamic SQL. The block of dynamic SQL has a query plan of its own. Summary: Never ever concatenate user input values with strings to build dynamic sql statements. Always use parameterised queries which not only promotes cached query plans reuse but also prevent sql injection attacks.
Views: 22751 kudvenkat
Estimated & actual execution plans with SQL Query Tuning | Pluralsight
 
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SQL Server Performance: Introduction to Query Tuning | http://www.pluralsight-training.net/microsoft/courses/TableOfContents?courseName=query-tuning-introduction It takes more than "Select *" to make a great SQL query. In this video excerpt from Vinod Kumar's and Pinal Dave's new course SQL Server Performance: Introduction to Query Tuning you'll see how to view the execution plans for your queries including the differences between estimated and actual plans as well as how your query hints can affect the execution plan in unforeseen ways. In the full course, the two go on to cover topics such as indexing techniques, how order of tables and query hints affect execution, and how to use various tools to optimize queries. Visit us at: Facebook: https://www.facebook.com/pluralsight Twitter: https://twitter.com/pluralsight Google+: https://plus.google.com/+pluralsight LinkedIn: https://www.linkedin.com/company/pluralsight Instagram: http://instagram.com/pluralsight Blog: http://blog.pluralsight.com/ 3,500 courses unlimited and online. Start your 10-day FREE trial now: https://www.pluralsight.com/a/subscribe/step1?isTrial=True Estimated & actual execution plans with SQL Query Tuning | Pluralsight -~-~~-~~~-~~-~- Push your limits. Expand your potential. Smarter than yesterday- https://www.youtube.com/watch?v=k2s77i9zTek -~-~~-~~~-~~-~-
Views: 14460 Pluralsight
Oracle SQL Performance Tuning  1
 
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Oracle SQL Performance Tuning and tips Cost Based Optimizer (CBO) Rule Based Optimizer (RBO) SQL Explain Plan Oracle Explain Plan
Views: 10637 TechLake
Query Analysis and Optimizing in Oracle
 
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Database Management Systems 11. Query Analysis and Optimizing in Oracle ADUni
Views: 83152 Chao Xu
Oracle SQL Monitoring - Performance Analysis
 
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SQL Monitoring is the best new feature of Oracle 11g for performance analysts, developers and support teams. Finally there is a tool that provides the most accurate, useful and interesting information when a SQL statement is running for longer than expected in a clear format with no minimal advance configuration requirements: What execution plan is really being used? What row source cardinality calculations are incorrect? What steps in the plan are taking the most time and consuming most resources? In this presentation, Doug Burns will demonstrate the various ways of accessing SQL Monitoring functionality and use example reports to show how the information can be used to analyse both currently running and completed statements. It will also describe and offer solutions to some of the minor quirks you might encounter. For our complete archive, and to sign up for upcoming webinars please go to http://www.red-gate.com/oracle-webinars
Views: 5092 Redgate Videos
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.
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: 13502 OracleDBVision
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: 83525 LearnItFirst.com
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: 18014 The Magic of SQL
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: 5380 SkillBuilders
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: 1984 SkillBuilders
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: 653 SkillBuilders
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: 7374 Maria Colgan
Oracle Performance - SQL Baseline Exercises
 
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Oracle Performance - SQL Baseline Exercises
Views: 2690 The Silent DBA
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: 3043 SkillBuilders
Query Execution Plans
 
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SQL Server Unlocked Series- Query Execution Plans In this video, we will be discussing query execution plans and how to use them properly. In this video, Morelan starts out with an analogy relating SQL Server to your kid. I know this sounds pretty far-fetched, but he has a point, so give it a chance. He goes on to describe how you want SQL Server to perform to the best of its ability, same as you would want your kids to do, hence why we use query execution plans. Additionally, If you lose something such as your keys, you probably want a tool that shows you how to find that item, if you set up your SQL server right, this is just the tool- not to find the keys but to find data. All-in-all SQL server can save you time if you use it right and you know how to use it right. This mini-series is a good starter on how to do so. Have a look at the video, and if you want to learn more, take our class Developer 2012 Volume 3 Video 9.1. See more at: http://www.joes2pros.com/joes2pros/courses Full Blog: http://joes2prosblog.social27.com/
What is SQL Profile in Oracle Database
 
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n this video you will understand what is an SQL profile and how does it help in SQL plan generation and execution. The entire course on Interpreting an AWR report is available at udemy https://www.udemy.com/oracle-database-troubleshooting-and-tuning You can use Coupon Code YOUTUBETT for discount 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: 1361 Ramkumar Swaminathan
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: 3340 OrSkl Academy
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: 4767 The Magic of SQL
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: 2747 Randolf Geist
Reading Oracle SQL Execution Plans - Practice Makes Perfect
 
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To tune a SQL statement, you need to understand the execution plan. Can you identify the 1st step in an execution plan? The 2nd? The 3rd? In this short tutorial, Oracle Certified Master DBA John Watson of SkillBuilders uses a MERGE JOIN to help you understand how to find the order of execution, essential for SQL tuning.
Views: 1143 SkillBuilders
Oracle SQL Tuning Expert Series - Understanding Indexes
 
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Ross Leishman of DWS Ltd presents the principles of Understanding Indexes for SQL Tuning. The presentation includes an entertaining demonstration of Indexes featuring DWS Alumnus Jordan Thomas as a "Buffer Cache". DWS Ltd is a leading publicly listed Australian IT Services company, providing services to blue chip organisations since 1991. With a business philosophy based upon integrity, reliability and professional service delivery, DWS provides end to end IT solutions. www.dws.com.au
Views: 43662 DWS Ltd
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: 4195 Training2SQL MSBI
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: 1738 Themis Education
Oracle SQL SELECT Query Execution Process
 
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Query Execution Process
Views: 1620 PNR Tech
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: 11818 SkillBuilders
Oracle 11g Hints Overview
 
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In this Video tutorial we will discuss about Optimizer hints in Oracle. What is optimizer hint, when & why its needed. Different Category of hints. Description of mostly used hints. Demonstrate how query plan can change with the influence of hint.
Views: 51293 Anindya Das
Oracle  AUTOTRACE Fundamentals to Analyze & Tune SQL
 
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This Tutorial will explain fundamentals of Oracle AUTOTRACE. Set up & Use AUTOTRACE. Review PLAN & Statistics generated by AUTOTRACE. Understanding Statistics details.
Views: 22644 Anindya Das
Understanding SQL Trace, TKPROF and Execution Plan for Beginners
 
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Presenter: Carlos Sierra, Oracle Corporation In this session, participants will learn about producing a SQL Trace then a summary TKPROF report. A sample TKPROF is navigated with the audience, where the trivial and the not so trivial is exposed and explained. Execution Plans are also navigated and explained, so participants can later untangle complex execution plans and start diagnosing SQL performing badly.
Views: 506 ODTUG

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