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Oracle Hints Tutorial for improving performance
 
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Oracle Hints Tutorial for improving performance APPEND PARALLEL JOIN INDEX NO_INDEX SELECT /*+ FIRST_ROWS(10) */ * FROM emp WHERE deptno = 10; SELECT /*+ ALL_ROWS */ * FROM emp WHERE deptno = 10; SELECT /*+ NO_INDEX(emp emp_dept_idx) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ INDEX(e,emp_dept_idx) */ * FROM emp e WHERE e.deptno = 10; -- SELECT /*+ INDEX(scott.emp,emp_dept_idx) */ * FROM scott.emp; SELECT /*+ AND_EQUAL(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ INDEX_JOIN(e,emp_dept_idx) */ * FROM emp e; SELECT /*+ PARALLEL_INDEX(e,emp_dept_idx , 8) */ * FROM emp e; SELECT /*+ LEADING (dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; SELECT /*+ PARALLEL(8) CACHE (e) FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL FULL (e) */ * FROM emp e ; SELECT /*+ PARALLEL USE_MERGE (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- SORT Merge Join SELECT /*+ PARALLEL USE_HASH (emp dept) */ * FROM emp, dept WHERE emp.deptno = dept.deptno; -- Hash Join SELECT /*+ PARALLEL */ * FROM emp e ; INSERT /*+ APPEND */ INTO mytmp select /*+ CACHE (e) */ *from emp e; commit;
Views: 8541 TechLake
T-SQL: JOIN OPERATORS - NESTED LOOP JOIN, MERGE JOIN AND HASH JOIN
 
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In this video, I will describe the 3 Join Operators SQL Server uses and the reason why it comes to the individual selections by the Optimizer. Please check my blog azizsharif.blogspot.com for more videos!
Reference partitioning in Oracle 11g
 
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The video explains Reference partitioning and its advantages in Oracle with real project example. It builds on the limitations of reference partitioning in oracle 11g (Interval partitioning) and scenarios where you should implement reference partitioning
Views: 2107 Tech Coach
AskTOM Office Hours: Hash Joins and Database In-Memory
 
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Held on April 20 2018 Andy Rivenes (@TheInMemoryGuy) and Maria Colgan (@SQLMaria) focused on a deep dive into hash joins and how they are used with Database In-Memory to make joins lightning fast. The session began by reviewing how traditional hash joins work and then addressed Bloom filters and how Database In-Memory uses them to effectively turn hash joins into scan and filter operations. The use of Join Groups was then discussed as a way to further enhance join performance in 12.2 and beyond. AskTOM Office Hours offers free, monthly training and tips on how to make the most of Oracle Database, from Oracle product managers, developers and evangelists. https://asktom.oracle.com/ Oracle Developers portal: https://developer.oracle.com/ Sign up for an Oracle Cloud trial: https://cloud.oracle.com/en_US/tryit music: bensound.com
Views: 487 Oracle Developers
Hash Partition in Oracle
 
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This course has been designed to impart the in-depth knowledge about the partitioning types and architecture in the Oracle RDBMS. For more information on this course, please visit https://www.koenig-solutions.com/oracle-database-12-c-implement-partitioning-training.aspx
Views: 94 Koenig Solutions
Hash Join
 
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#Oracle #HashJoin How a Hash Join is executed
Views: 2053 Hemant K Chitale
(오라클힌트교육,SQL튜닝)오라클힌트를 이용한 쿼리 튜닝, 중첩루프조인유도힌트, oracle hint/ordered/use nl_
 
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Hints for Join Orders(USE_NL) - USE_NL 힌트는 테이블을 조인 하는 경우 중첩 루프 조인(Nested Loop Join)이 일어나도록 하는 힌트 문장이다. 중첩 루프 조인은 중첩반복 이라고도 하는데 하나의 테이블(outer/driving table)에서 추출된 ROW를 가지고 일일이 다른 테이블(inner/probed table)을 반복해서 조회하여 찾아지는 레코드를 최종 데이터로 간주하는 방법 이다. - EMP 테이블과 DEPT 테이블을 조인하는 경우 DEPT 테이블이 건수가 작다면 우선 이 테이블을 외부 루프로 해서 하나씩 읽으면서 이에 대응하는 EMP 테이블의 데이터를 추출 하는 경우가 중첩 루프 조인에 해당 한다. 이때 EMP 테이블의 경우 대부분 조인 칼럼에 인덱스를 이용하는 것이 성능상 좋다. 즉 중첩 루프 조인은 테이블 중 적어도 하나의 조인 컬럼에 대해 인덱스(or Hash Index)가 존재할 때 연관되는 방식으로 이 중첩 루프 조인에서 테이블 중 하나의 테이블 또는 중간 결과 셋을 대상으로 FULL SCAN이 일어나게 된다.  보통 USE_NL 힌트 구문은 ORDERED 힌트 구문과 같이 사용되는데 USE_NL이 취하는 인자는 FROM절에서 두 번째 나오는 테이블(비드라이빙 테이블, inner/probed table)을 명시해 주어야 한다. 인수로 사용되지 않은 첫 번째 테이블이 드라이빙 테이블(outer table)이 된다. Hints for Join Orders(ORDERED)  힌트는 FROM 뒤에 기술되는 테이블의 순서대로 조인이 일어나도록 해주는 구문이며 대부분 단독으로는 사용되지 않고 USE_NL(중첩 루프 조인을 유도), USE_MERGE(머지 소트 조인을 유도), USE_HASH(HASH 조인을 유도)등과 같이 사용된다.  USE_NL/USE_MERGE/USE_HASH등의 인자로 사용되는 테이블은 FROM절에서 두 번째로 나타나는 테이블 이어야 하는데 FROM절에서 처음 나타나는 테이블이 드라이빙 테이블(OUTER/DRIVING TABLE)이 되고 나중에 나타나는 테이블이 PROBED TABLE(INNER TABLE)이 된다. 보통 드라이빙 테이블의 경우 데이터 건수가 적거나 조인 칼럼에 대해 인덱스가 없는 테이블이 주로 사용된다.  중첩 루프 조인(Nested Loop Join)이나 해시조인(Hash Join)의 경우 성능이 FROM절 뒤에 나타나는 테이블의 순서에 영향을 받지만 MERGE 조인은 영향을 받지 않는다. 머지 조인은 메모리에 올려서 정렬 시킨 후 병합하니까 실행 계획은 다르게 나올지 모르지만 성능에는 관계 없다.
Views: 213 이종철
Hash Join on SQL
 
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Hash Join on SQL
Views: 195 TUTOR SC
11g Nested Loop
 
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#Oracle #NestedLoop 11g Enhancement
Views: 865 Hemant K Chitale
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: 53238 Anindya Das
Join Methods: Nested Loop, Hash, Sort, Merge, Adaptive
 
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Here is a replay of the live demo I did at POUG 2018 to explain the join methods. sql monitor to show the execution plan in real time and gdb breakpoints to stop on the different operations. I'll do the same at DOAG and maybe more. Follow https://medium.com/@FranckPachot/conferences-2018-7b821155591 to be informed.
Views: 624 Franck Pachot
14.412 Simple Hash Join
 
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My book "Patterns in Data Management" is now available both as an ebook or a print book (with color graphics!). See: http://amzn.to/1Ts3rwx This book is not a standard textbook on database techniques. This book was written extending and complementing preexisting educational videos (including this one). Video for my inverted classroom "Database Systems". The complete list of videos, slides, and additional material is (will be) available at http://datenbankenlernen.de Computer Science, Saarland University: Bachelor (in German): http://www.cs.uni-saarland.de/index.p... Master (in English): http://www.cs.uni-saarland.de/index.p... Ph.D./Grad School: http://gradschool.cs.uni-saarland.de/
Query Processing - Block Nested Loop Join, Index Nested Loop Join, Merge Join, Hash Join
 
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Complete set of Video Lessons and Notes available only at http://www.studyyaar.com/index.php/module/28-query-processing-and-optimization Block Nested Loop Join, Index Nested Loop Join, Merge Join, Hash Join http://www.studyyaar.com/index.php/module-video/watch/72-query-processing-more-join-algorithms
Views: 27147 StudyYaar.com
Hints
 
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Hints watch more videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjab, Tutorials Point India Private Limited
What is a Hash Partition in Oracle
 
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What is a Hash Partition in Oracle SQL Tutorial SQL Tutorial for beginners PLSQL Tutorial PLSQL Tutorial for beginners PL/SQL Tutorial PL SQL Tutorial PL SQL Tutorial for beginners PL/SQL Tutorial for beginners Oracle SQL Tutorial
Views: 1078 TechLake
Focus on Hash Joins - Join Groups
 
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Ask TOM Office Hours demo - Focus On Hash Joins This demonstration reviews how Database In-Memory can use Join Groups to further improve hash join performance. You can see the full session and join us for more Office Hours sessions at https://asktom.oracle.com/pls/apex/f?p=100:551:::NO:551:P551_CLASS_ID:3843:
VTS: The Oracle Optimizer...Great complexity, but...
 
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Oracle Ace Liron Amitzi presents an entertaining session about appreciating the Oracle Optimizer; exploring the stability of plans and examining new features that ruin your system performance, just when you get it tuned just right.
Views: 597 Database Community
The Importance of Nested Loops Joins in SQL
 
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Nested Loops Joins are one of the primary physical join operators used by SQL Server. In today's episode we discuss how Nested Loops Joins work, as well as how to use that knowledge to troubleshoot a slow performing query's execution plan. Subscribe and turn on notifications to never miss a weekly video: https://www.youtube.com/c/bertwagner?sub_confirmation=1 Related blog post with code snippets: https://bertwagner.com/2018/12/11/visualizing-nested-loops-joins-and-understanding-their-implications/ Be sure to check out part 2 on merge joins: https://youtu.be/IFUB8iw46RI And part 3 on hash match joins: https://youtu.be/59C8c7p_hII Additional excellent blog posts that go further in-depth: https://blogs.msdn.microsoft.com/craigfr/2006/07/26/nested-loops-join/ https://sqlserverfast.com/epr/nested-loops/ Follow me on Twitter: https://twitter.com/bertwagner
Views: 810 Bert Wagner
Using Hint Parallel
 
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Cơ sở dữ liệu nâng cao
Views: 270 h2a
Nested Loop Join on SQL
 
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Nested Loop Join on SQl
Views: 87 TUTOR SC
Oracle Hints - FIRST_ROWS - Example
 
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Excerpt from "Oracle sql tuning-advanced" video tutorial training. www.dbvidya.com/course/sql-tuning-advanced/ [email protected] +91 991 2323 000 Oracle Performance Tuning Online Training : http://www.dbvidya.com/course/performance-tuning-for-dba/ Oracle SQL Performance Tuning Training Online : http://www.dbvidya.com/course/sql-tuning-advanced/ Oracle Performance Tuning Videos Tutorial for DBA and Developers : http://www.dbvidya.com/oracle-performance-tuning-videos/ Oracle AWR Tutorial: http://www.dbvidya.com/course/oracle-awr/ Erwin Tool Online Training : http://www.dbvidya.com/course/erwin-tool/ ER Data Modeling Course : http://www.dbvidya.com/course/er-modeling/ Dimensional Modeling Training Online : http://www.dbvidya.com/course/dimensional-modeling/ Oracle Database Blogs : http://www.dbvidya.com/blog/
Views: 225 DbVidya
Oracle SQL MERGE Statement
 
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https://www.databasestar.com/oracle-merge-sql/ In this video, we’ll learn what the Oracle MERGE statement does and how you can use it. What is the MERGE statement? It’s a statement that lets you either insert or update data in a table - all in a single statement! It’s helpful if you’re using an ETL (Extract Transform Load) process when creating or updating a data warehouse. It’s also helpful when loading data into your own database if you’re not creating a data warehouse. It allows you to prevent duplicate data and ensure you have up-to-date data in your table. The syntax looks like this: MERGE INTO table_name USING table_name ON (condition) WHEN MATCHED THEN update_clause DELETE where_clause WHEN NOT MATCHED THEN insert_clause [LOG ERRORS log_errors_clause reject_limit integer | unlimited ] In this video, I also show an Oracle SQL MERGE statement example, so watch the video to find out more. For more information on the MERGE statement and how you can use it in your queries, read the related article here: https://www.databasestar.com/oracle-merge-sql/
Views: 955 Database Star
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/
Oracle Star Transformation
 
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Oracle Star Transformation
Views: 230 The Silent DBA
Nested Loop Join in SQL Server by Satya Ramesh
 
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In this video, you will learn about basics around Nested Loop join and how Nested Loop Join algorithm works. You will also learn about different scenarios where SQL Server decides to use Nested Loop Join operator and how it affects performance. Video resources including presentation, demo files, code snippets and more learning material is available on http://www.dataplatformgeeks.com/ (Join for free and access all the resources) Connect with The Speaker (Satya Ramesh) -Follow on Twitter: https://twitter.com/satyaramesh230 -Follow on FaceBook at https://www.facebook.com/satyaramesh230 -Follow on LinkedIN: https://www.linkedin.com/in/ramesh-sa... Connect with SQLMaestros: http://sqlmaestros.com/ -http://www.twitter.com/SQLMaestros -https://www.facebook.com/SQLMaestros -Email us: [email protected] Have technical questions? Join the largest SQL group on FB www.facebook.com/groups/theSQLGeeks Our LinkedIn group https://www.linkedin.com/groups/6753546 DataPlatformGeeks (DPG) Community Join the fastest growing community of data & analytics professionals Why Join DPG? http://www.dataplatformgeeks.com/ -Attend all events hosted by DPG, including SQLMaestros Special Events -Get access to free videos, labs, magazines and host of learning resources -Download all events & conference material -Learn new skills. Sharpen existing skills -Be part of Asia’s Largest Data/Analytics Community -Opportunity to be a regional mentor & speaker at our events -Immense technical & professional development Do you know about Data Platform Summit? http://www.DPS10.com
Views: 1243 SQLMaestros
Focus on Hash Joins - Using Database In-Memory
 
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Ask TOM Office Hours demo - Focus On Hash Joins This demonstration reviews how Database In-Memory uses Hash Joins and Bloom filters to provide up to a 10x performance improvement. You can see the full session and join us for more Office Hours sessions at https://asktom.oracle.com/pls/apex
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: 15061 amit wadbude
Hints and Tips - A silent movie on joins
 
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The vision says it all ... a basic primer on how joins are performed in Oracle, using the metaphor of playing cards. Enjoy... ========================================­============== 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: 2002 Connor McDonald
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: 13239 Tech Query Pond
SQL Advanced Videos REUPLOAD #3: Nested Loop Join
 
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I talk about the first of three physical #join operator. We begin with #NestedLoopJoin, the most simple and known physical JOIN Operator in #SQL. This is a re-upload of my old video due to many complaints about the annoying background music. Join my discord: https://discord.gg/5aWE33f
Views: 944 SQL TV
SQL Tuning How to Tune Joins - Lesson 1
 
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How do you tune SQL Joins? Start with the most important ingredient - the join order! In this free tutorial by Oracle Certified Master DBA John Watson of SkillBuilders.com you will learn what is the best join order and how to get the optimal join order. Watch all Lessons, FREE, at http://skillbuilders.com/tuning-joins-optimal-join-order.
Views: 3435 SkillBuilders
How Does a Hint Affect an Adaptive Join?
 
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Since adaptive joins can control their behavior, using either a hash or a nested loops, what happens when you start putting join hints into the mix. Let's explore that and see how the adaptive join, the execution plan, and the query performance is affected. -~-~~-~~~-~~-~- Please watch: "Extended Events Live Data Window " https://www.youtube.com/watch?v=UDtXjewvqmM -~-~~-~~~-~~-~- #sqlserver #performancetuning #adaptivejoin
Views: 66 Grant Fritchey
SQL Server Quickie #13 - Hash Join Operator
 
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In this SQL Server Quickie I'm talking about the Hash Join operator in SQL Server. You can find the scripts that were used for the demonstration here: http://www.sqlpassion.at/archive/2014/04/29/sql-server-quickie-13-hash-join-operator/
Views: 12867 SQLpassion
Using Parallel and Cardinal Hint
 
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This is a demo on using Parallel and Cardinal Hint to tune queries in ILM.
Views: 1324 Informatica Support
Oracle Performance Tuning onlineTraining
 
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Feel free to contact Call : +91-8870903864 Or E-mail [email protected] ORACLE PERFORMANCE TUNNING 1 – 1: Introduction to Oracle tuning - The top-down approach to tuning - The history of Oracle tuning - A review of the Oracle architecture - The goals of Oracle tuning - Overview of SQL tuning - Oracle network bottlenecks - Oracle RAM usage and bottlenecks - Oracle CPU usage and bottlenecks - Oracle disk I/O overview - Monitoring server (sat, vmstat, top, glance) - Movement toward server consolidation 1 – 2: Oracle disk I/O tuning - History of DASD - Understanding disk I/O - Monitoring disk I/O (AWR, dba_hist_filestatxs) - Sorted hash cluster tables - Disk I/O waits - Oracle data buffer internals (db_cache_size) - Caching data blocks in the PGA (parallel full-table scans) - Blocksize and I/O performance 1 – 3: Oracle CPU Tuning - Finding your cpu_count - Measuring CPU usage with vmstat - Oracle CPU usage - Using processor affinity - _optimizer_cost_model=cpu - Parallel query and CPU 1 – 4: Oracle RAM tuning - all_rows and first_rows optimization and RAM - Multiple data buffers - Multiple blocksizes - Measuring RAM paging - Oracle SGA RAM - Oracle PGA RAM - Using the KEEP pool - Automatic Memory Management (AMM) 1 – 5: Oracle Instance Tuning - Global tuning techniques - Display possible unnecessary large-table full-table scans - Library cache tuning - Finding missing indexes - Tuning the database writer - instance parameter tuning 1 – 6: Oracle SQL Tuning Introduction - SQL tuning hierarchy - SQL tuning goals - optimizer modes - query re-write - cursor_sharing - viewing execution plans (autotrace) - verifying optimal join techniques - parallelizing SQL execution - dynamic statistics - Exercise – count times when a table is invoked - 12c new SQL features - function-based virtual column - adaptive execution plans - 12c new optimizer metadata collection features 2 – 1: AWR and ASH - AWR vs STATSPACK - Reading an AWR report - AWR report analyzer - Basics of predictive modeling for performance - Finding repeating signatures of data 2 - 2: Oracle RAC Tuning - RAC architecture tuning - Tuning disk I/O on RAC - Tuning the cache fusion layer on RAC 2 – 3: Oracle Tuning Pack - creating SQL Profiles - Recommending new indexes - “automatic” SQL Tuning - SQL Performance Advisor (SPA) - recommending object reorganization 2 – 5: Oracle Diagnostic pack - AWR and ASH - real time SQL monitoring - comparing performance periods - Oracle monitoring & alert notifications (setting thresholds) 2 – 6: Oracle Tracing - 10046 tracing - TKPROF tracing - Trace analyzer - Autotrace 3 – 1: Introduction to SQL tuning - Pre-SQL database communications - The evolution of SQL - Declarative languages 3 –2: Optimizing Oracle SQL - Parsing a SQL statement - Semantic parsing - Hard parse vs. soft parse - Decision tree generation - Making SQL reentrant 3 –3: Optimizer statistics - Types of metadata - Index metadata - Segment metadata - Server metadata - System stats 3 – 4: Exposing & Reading Execution Plans - autotrace - SQL*Trace - Determine the steps of an execution plan 3 – 5: altering execution plans - Changing CBO statistics - Changing init.ora SGA parameters - Changing optimizer parameters - Using hints - Using the opt_param hint 3 – 6: Oracle indexing - Overview of Oracle indexing - bitmap indexes - bitmap join indexes - guidelines for creating indexes - function-based indexes (FBI) - index usage monitoring - fishing in the library cache - optimizing indexes - The transient nature of indexing - database modality of workloads - SQL Workload analysis - Identifying EOW, EOM and EOY SQL. - Creating on-demand indexing - oracle text indexes Oracle Performance Tuning training online, Oracle Performance Tuning training material, IBM Websphere Application Server training cost, Oracle Performance Tuning training pdf, Websphere Application Server training in USA uae India, Oracle Performance Tuning training, online Corporate training malaysia Singapore, Oracle Performance Tuning software, Oracle Performance Tuning training in bangalore, Oracle Performance Tuning training institutes in hyderabad, Oracle Performance Tuning training in chennai, Oracle Performance Tuning training in hyderabad, Delhi, Mumbai, Pune, Oracle Performance Tuning, IBM Websphere ApplicationServer webinar, online training singapore, Oracle Performance Tuning eam, Oracle Performance Tuning as a service,Oracle Performance Tuning online Training Oracle Performance Tuning online Training Oracle Performance Tuning online Training Oracle Performance Tuning online Training maximo scheduler, Oracle Performance Tuning (consumer product) Oracle Performance Tuning online Training Oracle Performance Tuning online Training Oracle Performance Tuning online Training Oracle Performance Tuning online Training Oracle Performance Tuning online Training , Post Training Support
Sort Merge Join on SQL
 
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Sort Merge Join on SQL
Views: 117 TUTOR SC
Hash Join
 
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Views: 10908 mrjazzs
Oracle Database 11g New Features: Performance Tuning with Feedback Based Optimization
 
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Oracle Database 11g provides a new feature called "feedback based optimization". In this tutorial you will learn what feedback-based optimization is and how it helps Oracle Database 11g performance. One part of nine tutorials dedicated to Oracle 11g Adaptive Cursor Sharing. View all 10 videos for free at SkillBuilders.com/ACS.
Views: 4744 SkillBuilders
Hints and Tips - Queries running whilst exchanging partitions - part 2
 
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Even when you rip out a partition from a table, queries can still execute successfully. ========================================­­­­============== 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: 1035 Connor McDonald
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: 99543 radhikaravikumar
Oracle Explain Plan
 
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Oracle SQL Executions: Explain Plan and Execution Plan A simple introduction with a single table example
Views: 1001 Hemant K Chitale
05 04 Reading an Execution Plan
 
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ORACLE
Views: 556 oracle ocm
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: 3487 SkillBuilders
Hint DRIVING_SITE para otimizar SQL distribuído
 
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Aprenda a otimizar SQL distribuído utilizando o hint DRIVING_SITE
Views: 250 Fabio Prado
Oracle Hints,
 
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Oracle Hints, Tips and advice - Hints and tips on various programming languages and development tools.
Views: 3852 018sube
Oracle SQL Developer's Tuning Features
 
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An overview of all the performance tuning and diagnostic features in Oracle SQL Developer including: Explain Plan, Autotrace, SQL Tuning Advsior, Real Time SQL Monitoring, ASH, Monitoring Sessions, and our new Instance Viewer.
Does SQL table join order matter?
 
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Have you ever wondered if the order of the tables in your FROM clause matter? In today's video, we look at why theoretically table join order *does* make a difference for performance and why SQL Server doesn't use the order you provide. We also look at different techniques for forcing SQL Server to use the join order you specified. Blog post with all demo code and links: https://bertwagner.com/2017/11/21/does-the-join-order-of-my-tables-matter/ Presentation by Adam Machanic on row goals: https://sqlbits.com/Sessions/Event14/Query_Tuning_Mastery_Clash_of_the_Row_Goals Music by Joakim Karud http://youtube.com/joakimkarud Follow me on Twitter: https://twitter.com/bertwagner Want to receive my latest weekly blog posts and videos in your inbox? Sign up for the newsletter here: https://upscri.be/c77fc8/
Views: 2061 Bert Wagner