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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: 8374 TechLake
Why Use Parallel Processing?
 
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This video compares the use of parallel and serial processing for the same SQL query. Copyright © 2012 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement.
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: 3100 Randolf Geist
Oracle Hints Tutorial for improving performance with examples
 
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Oracle Hints Tutorial for improving performance with examples Oracle Hints Oracle Tutorial for beginners SQL Tutorial for beginners SQL Hints SQL Performance tuning
Views: 3820 TechLake
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: 53131 Anindya Das
SQL: Optimizer Hints Part-1
 
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In this tutorial, you'll learn...what are optimizer hints and how to use it.. SQL (pronounced "ess-que-el") stands for Structured Query Language. SQL is used to communicate with a database. According to ANSI (American National Standards Institute), it is the standard language for relational database management systems.
Views: 20410 radhikaravikumar
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: 41526 itversity
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: 1322 Informatica Support
Optimize Replication using Parallel Extracts/Replicats in Oracle GoldenGate - GG Video 21
 
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In this video you will learn about some of the options you can use to Parallelise and Optimize/speedup replication in Oracle GoldenGate. . 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: 1358 Ramkumar Swaminathan
oracle parallelism
 
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Views: 164 Fatma Aksu
Using the qb_name Hint in Oracle Database
 
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Oracle ACE Ric Van Dyke shares a tip on using the qb_name hint in Oracle Database, and on how naming query blocks can make debugging a lot easier.
Views: 136 ArchBeat Archive
Tutorial: Algorithmic Aspects of Parallel Query Processing
 
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Tutorial: Algorithmic Aspects of Parallel Query Processing
Views: 263 Sigmod 2018
Parallel Query Has Arrived!
 
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Views: 868 PGCon
eXtrem Parallel Processing for Oracle
 
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eXtrem Parallel Processing for Oracle
Views: 193 Petr Jezek
Demonstrating Oracle DB Elapsed Time and Wall Time With Parallel Query
 
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Is it really true? In my recent postings I wrote that when using parallel query a SQL statement's wall time is roughly equal to its elapsed time divided by the number of parallel query slaves. To check I ran an experiment and posted the results. The results are both obvious and illuminating. If you don't want to read but just sit on the couch and watch a video, you're in luck! I created a special video clip demonstrating what I wrote about. The main video clip is from my OraPub Online Institute video seminar, Tuning Oracle Using An AWR Report - Part 1. (NOT Part 2 as the video shows) From my blog posting: http://blog.orapub.com/20140907/watch-oracle-database-elapsed-time-and-wall-time-with-parallel-query.html For more information on OraPub r for more great education, go to www.orapub.com
Views: 1215 OraPub, Inc.
Using Partition Wise Join
 
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This video shows you the use of partition wise join in parallel processing. Copyright © 2012 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement.
Analyzing and Troubleshooting Oracle Parallel Execution
 
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Presented by Randolf Geist 8th May 2013 Oracle parallel execution, a feature of the Enterprise Edition, allows you to automatically distribute the processing of a SQL statement execution among multiple worker processes. This requires additional effort when analysing and troubleshooting such parallel executions, since it adds complexity that is simply not there with normal serial execution where only a single process is involved. In this webinar, Randolf Geist, provides an overview of what these additional challenges are and how these can be approached. For our complete archive, and to sign up for upcoming webinars please go to http://www.red-gate.com/oracle-webinars
Views: 3461 Redgate Videos
Using Hint Parallel
 
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Cơ sở dữ liệu nâng cao
Views: 269 h2a
Real-World Performance - 8 - Set Based Parallel Processing
 
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Check out the entire series on the Oracle Learning Library at http://www.oracle.com/goto/oll/rwp In this video, listen and watch Andrew Holdsworth, Vice President of Oracle Database Real-World Performance at Oracle Corporation, as he demonstrates how set based parallel processing affects performance. Copyright © 2014 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement.
PL/SQL tutorial 74: PL/SQL Bulk Collect Clause with FETCH-INTO statement of an explicit cursor
 
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RebellionRider.com presents a PL/SQL tutorial on how to use PL/SQL Bulk Collect with Fetch-Into statement of an explicit cursor in Oracle Database. Watch and learn how to enhance query performance with Bulk Collect in Oracle Database by Manish Sharma. ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog: http://bit.ly/bulk-collect-3 Previous Tutorial ► Introduction to Bulk Collect: https://youtu.be/HPVzFBluM_Q ► Explicit Cursor: https://youtu.be/3q7dW_d2KVc ► Simple Loop: https://youtu.be/AFx6QYcY1CU ► The script on GIT: https://github.com/RebellionRider/pl-sql-tut-74.git ------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! ------------------------------------------------------------------------- ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ ___Facebook Official Page of Manish Sharma___ https://www.facebook.com/TheRebellionRider/ ___Facebook Official Page of RebellionRider.com___ https://www.facebook.com/RebellionRider.official/ For E-mail address please check the About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 10173 Manish Sharma
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: 1033 Connor McDonald
Hierarchical Queries (Oracle)
 
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Hierarchical Queries in Oracle, Using CONNECT BY PRIOR and START WITH clause. Visual Example using a practical scenario.
Views: 5615 CodeSmith 001
Enhancing Tableau Data Queries
 
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Speaker- Alex Lokhov, Alex Eskinasy Check out the various techniques for optimising live connections in Tableau. We will tackle techniques to optimise query performance from the Tableau side as well as the database side. Expect a recap of general performance tips in Tableau, an understanding of what happens under the covers (i.e. order of execution in Tableau, performance recording and implementation plan in a database), and a review of joins vs. blends vs. cross-database joins, performance implications, resulting queries, and more.
Views: 4138 Tableau Software
Thinking in Parallel
 
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The Java 8 Streams library makes it easy to run code in parallel. A common error is code that works when run sequentially but that misbehaves when run in parallel. This is often caused by programmers who are stuck in a mode of imperative, left-to-right thinking. This leads to an iterative style in which data is mutated and where the next result depends on the result of the previous computation, creating barriers to parallel computation. This presentation covers an alternative programming technique called array programming, where operations are applied on data aggregates instead of individual elements. It also includes examples and demonstrations that illustrate these techniques and how they lead to easier-to-understand, parallel-ready code.
Views: 4219 Oracle Developers
DML Processing in an Oracle Database -  DBArch Video 8
 
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This video explains the steps involved in processing a DML statement in an Oracle Database Server. 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: 57813 Ramkumar Swaminathan
[Oracle SQL Performance Tuning: 4/4] Basic Hints and their Usage
 
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This presentation explains how to use basic hints of Oracle. The series of SQL tuning videos presents performance tuning tips for developers. For presentation used in this video, please visit: https://drive.google.com/drive/folders/0B6EDqGZwjejmWng5VWM3ZEtaNzA?usp=sharing
Views: 10925 anilkumar ghorakavi
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: 4894 ODTUG
eXtreme Parallel Processing for Oracle
 
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Is your current processing task complex and depending on CPU? Does it take too much time processing your PL/SQL eventhough you have strong HW? Don't have time to rewrite PL/SQL sources to optimize them? If your answer is yes, then our product eXtreme Parallel Processing for Oracle is exactly for you
Views: 55 Petr Jezek
How to Create Database Link in Oracle. /* Step By Step /*
 
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Today I am showing you. How to create Database link (DB Link) in Oracle. What is Database Link ( DB Link ) ? A database link is a schema object in one database that enables you to access objects on another database. I have 2 databases 1. paragdb 2. orcl In Paragdb database 1. Create listener 2. Service Name 3. In Orcl Database 1. Create Listener 2. Service Name 3. Create new User 4.Grant connect,resource,create database link to username; 5. open user 6. create database link 1. create database link link1 connect to scott identified by tiger using 'connect_primary''; 7.select * from [email protected]; 8. select * from [email protected]; 9. views 1. select * from user_db_links; 2. select * from all_db_links; 10. conn sys as sysdba 11. grant public database link to username; 12. select * from dba_db_links; 13. conn username/pass 14. create public database link plink connect to scott identified by tiger using 'connect_primary'; 15. drop database link. drop database link link1; To follow this steps you will also create oracle database link. It is very easy to understand.
Views: 8847 Parag Mahalle
Using Parallel GROUP BY
 
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This video shows you the behavior of the GROUP BY clause when run in serial and in parallel. Copyright © 2012 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement.
Parallel Execution In an Oracle RAC environment
 
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In an Oracle RAC environment, a SQL statement executed in parallel can run across all of the nodes in the cluster. For more information please visit https://www.koenig-solutions.com/oracle-database-12c-rac-administration-training.aspx
Views: 52 Koenig Solutions
SQL: Introduction to Optimizer in Oracle
 
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In this tutorial, you'll know what is the meaning and use of Optimizer in Oracle
Views: 18192 radhikaravikumar
Tracing Parallel Execution
 
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This video shows how to trace parallel executions. Copyright © 2012 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement.
Database Time-Based Performance Tuning: From Theory to Practice
 
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In this 2014 OpenWorld session, Graham Wood covers how you can identify bottlenecks and maximize database performance with Oracle’s unique database time methodology. It covers a rich toolset at the disposal of DBAs—from Oracle Enterprise Manager 12c’s Automatic Workload Repository and Active Session History features to Oracle Database’s Automatic Database Diagnostics Monitor feature—and how these tools work together seamlessly. The session also provides an in-depth understanding of how the database time methodology is used in Oracle Enterprise Manager to provide a simple yet effective method to diagnose and resolve performance problems with just a couple of mouse clicks.
Parallel Query In PostgreSQL  Robert Haas
 
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I and others have been working on bringing parallel query for PostgreSQL for several years now, but PostgreSQL 9.6 is the first release expected to include a user-visible feature. And it's pretty cool. In this talk, I'll give an overview of the development of this feature, where we are now, and what the future might hold. I will discuss the overall architecture of parallelism in PostgreSQL, give examples of queries that can be accelerated by the features expected to be in PostgreSQL 9.6, and talk about what's not done yet. http://www.pgconf.us/2016/event/147/parallel-query-in-postgresql/
Views: 1505 Postgres Conference
Use NOCOPY to Improve Performance
 
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The NOCOPY parameter hint tells the PL/SQL compiler to pass OUT and IN-OUT parameters "by reference" (meaning: do not copy in, nor copy out). The result is better performance and reduced PGA consumption. ====================================== Practically Perfect PL/SQL with Steven Feuerstein 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.
Sql Server Degree of Parallelism and Parallel Query Plans
 
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Hey DBA guys! Ever wondered what goes behind when SQL Server chooses a parallel query plan or otherwise? Here's a slideshow explaining that! Happy reading! Got some feedback? Mail me at [email protected] ! Enjoy!
Views: 742 SQL Server DBA
Automatic Big Table Caching
 
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This is the second of two demonstrations about In-Memory caching new features, introduced in Oracle Database 12.1.0.2. This one illustrates the Automatic Big Table caching feature enhancing the in-memory parallel query capabilities of the Oracle Database in both single instance and Oracle RAC environments. An optional section of the buffer cache, called the big table cache, is used to store data for serial and parallel table scans. Copyright © 2014 Oracle and/or its affiliates. Oracle® is a registered trademark of Oracle and/or its affiliates. All rights reserved. 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 of merchantability, fitness for a particular purpose, and non-infringement.
Oracle Tuning Tutorial - Long Full Table Scans Part 5 of 5
 
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See all 5 tutorials, free, at SkillBuilders.com/OracleTuningFullTableScans. In summary, serial full table scans were always indirect before 11.2, parallel scans always direct before 11.2. These are the two critical parameters. That hidden parameter _serial_direct_read, remember, defaults to auto so your application may start behaving very differently as you upgrade from 11.2.01 or 11.2.02. Parallel_degree_policy, that defaults to manual. But again, it becomes an option when you go to 11.2 to enable the automatic facility which allows not only automatic tuning to the degree of parallelism but also enables the ability to make indirect reads when doing a full table scan.
Views: 1615 SkillBuilders
New in Postgres 9.6: Parallel Queries
 
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In this episode, we'll be looking at a new feature in Postgres 9.6, parallel queries. To learn more and for full transcript visit us at https://www.pgcasts.com This episode is sponsored by Hashrocket a consultancy specializing in PostgreSQL. Visit us at https://hashrocket.com
Views: 3572 PG Casts
What is Parallel Calculation?
 
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interRel presents Look Smarter Than You Are with Oracle Essbase: What is Parallel Calculation? Ever wonder what a parallel calculation is? Edward Roske, Oracle ACE Director and CEO of interRel gives you the scoop on what it is and how to leverage it to improve calculation performance! To see more of our videos, go to http://epm.bi/videos
Views: 1850 interRel Consulting
Hassan Chafi, Research Manager, Oracle Labs @ MLconf ATL
 
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PGX: An In-Memory, Parallel Graph Analytic and Query Engine Brief Description: In-memory (and distributed) graph analytic engine that is tightly coupled with a relational database. Long Description/Abstract: We present a graph processing system in which a graph database is tightly integrated with a graph analytic engine. Our graph database, based on existing NoSQL and relational databases, provides scalable management of graph data for transactional workloads. Our graph analytic engine, on the other hand, enables rapid execution of analytic workloads. We first introduce PGX, our in-memory graph analytic engine which initially loads up the graph data from the database and periodically synchronizes afterward. The parallel execution engine of PGX is very efficient – e.g. counting triangles in billion-edge graphs in 2 minutes. The users can also submit their custom graph algorithms written in a domain-specific language; PGX automatically parallelizes them for execution. Then we introduce PGX.DIST, our distributed graph analytic engine. We show that PGX.DIST is up to orders of magnitude faster than the state-of-art graph analytic engine. The DSL compiler can help running the same algorithm on both PGX and PGX.DIST, transparently. * Graph database tightly integrated with graph analytic engine * Fast, parallel in-memory graph analytic engine * Distributed graph analytic engine * Use of Domain-Specific Language for graph analytics
Views: 622 MLconf
Parallel Execution Skew in less than four minutes
 
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Learn what I've published about the topic "Parallel Execution Skew" in this four minutes summary
Views: 626 Randolf Geist
Why Has an Index Broken My Query?
 
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Sometimes Oracle can give unexpected exceptions. This often happens when working with dates stored as strings. In this video, Chris investigates why adding an index to a varchar storing dates could cause a query to fail. He explains why this happens. Then he shows workaround to avoid this. You can download the scripts in this video from LiveSQL at: https://livesql.oracle.com/apex/livesql/file/content_CVN82PZQWQSUFYMOVKG0VI19T.html ============================ 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: 2963 The Magic of SQL
SQL Advanced Videos #5: Hash Join
 
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The last of the three physical join operator and by far the most interesting one. However we pay a price in terms of memory for that interesting join :) #sql #database #hashjoin #hash #join
Views: 2796 SQL TV
14.416 Sort-Merge Join, Co-Grouping
 
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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/