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Index organised tables and heap tables, creating index organised tables
 
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Index organised tables and heap tables, creating index organised tables For Students of B.Tech, B.E, MCA, BCA, B.Sc., M.Sc., Courses - As Per IP University Syllabus and Other Engineering Courses
Heap Tables and Index Organized Tables in Oracle | Chris Saxon
 
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Chris Saxon, a database evangelist, developer advocate, and SQL specialist with Oracle, uses up his two minutes with a tip on using heap tables and index organized tables in Oracle Database.
Heap tables
 
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Views: 1154 Nikolay Savvinov
Oracle Heap Tables or SQL Server Clustered Indexes
 
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Live discussion between Jonathan Lewis and Grant Fritchey. Thurs 7th June 2012 Oracle and SQL Server may both share a common language, but certain things are handled quite differently. Jonathan Lewis (OakTable Network, Oracle Ace Director) is used to seeing heap tables (almost) everywhere, but Grant Fritchey (Microsoft SQL Server MVP) is used to seeing clustered indexes (almost) everywhere. But which arrangement performs better? And is comparative performance even the right thing to measure? In this live discussion, these two heavyweights in their respective technology areas will debate the pros and cons of Oracle Heap Tables and SQL Clustered Indexes. Jonathan and Grant may even play a few unexpected cards during the discussion. Be prepared for a lively exchange which will not only entertain, but will teach you key concepts on Oracle and SQL Server. For our complete archive, and to sign up for upcoming webinars please go to http://www.red-gate.com/oracle-webinars
Views: 859 Redgate Videos
Oracle 12c Release 2 - How to move a heap table online
 
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Need to reorganize a table ? Want to do it whenever you want without impacting any users ? Easy in 12.2 ========================================­­­­============== Copyright © 2017 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: 395 Connor McDonald
Index Organized Tables and Examples
 
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Index Organized Tables and Examples watch more videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjab, Tutorials Point India Private Limited
A Story of Indexes and Full Table Scans: Finding All the Red Sweets Part 1
 
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"Why isn't Oracle using my index?!" is a common question people have when tuning SQL queries. In this episode Chris compares two methods for finding all the red candies from party bags he's prepared. He shows how these are like a full table scan and an index range scan. He goes on to compare the performance of these two approaches. He shows when a full table scan becomes more efficient than an index range scan and vice versa. ============================ 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: 6828 The Magic of SQL
SQL tutorial 62: Indexes In Oracle Database By Manish Sharma RebellionRider
 
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Watch and learn concepts of SQL Index In Oracle Database. In this tutorial you will learn about B-Tree Index and Function based Index. ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : Previous Tutorial ► ------------------------------------------------------------------------- ►►►Help Me In Getting A Job◄◄◄ ►Help Me In Getting A Good Job By Connecting With Me on My LinkedIn and Endorsing My Skills. All My Contact Info is Down Below. You Can Also Refer Me To Your Company Thanks ------------------------------------------------------------------------- Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=kb4rc1 -------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! -------------------------------------------------------------------------- Amazon Wishlist: http://bit.ly/wishlist-amazon ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at for E-mail address please check 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: 37900 Manish Sharma
Comparing Temporary Tables in Oracle and SQL Server
 
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Presented by Jonathan Lewis (Oracle ACE Director, OakTable) and Grant Fritchey (SQL Server MVP) Thurs 11th October 2012 Summary Temporary tables are often used in applications for processes that are difficult to complete in a single pass. They are widely used in SQL Server development and can be local and global. In Oracle temporary tables are created with a static global definition, but are used to hold temporary local content. But is this the only difference in temporary tables in Oracle and SQL Server? What about the performance impacts/gains for using temporary tables, and does this differ in Oracle and SQL Server? Once again Jonathan Lewis (Oracle Ace Director, OakTable Network) and Grant Fritchey (Microsoft SQL Server MVP) will host a live discussion on Oracle and SQL Server, this time in relation to temporary tables. Will they agree on some common ground? Or will it be an out and out argument? Either way, be prepared for a lively exchange that will not only entertain, but will teach you key concepts on Oracle and SQL Server. A Q+A session with Jonathan and Grant will follow the presentation. For our complete archive, and to sign up for upcoming webinars please go to http://www.red-gate.com/oracle-webinars
Views: 2665 Redgate Videos
42 Oracle 11g Tutorials    Types of Tables
 
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Introduction to Oracle 11g Tuts
Views: 542 saratutus
01 Overview of table Partition in oracle
 
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Partitioning enhances the performance, manageability, and availability of a wide variety of applications and helps reduce the total cost of ownership for storing large amounts of data. Partitioning allows tables, indexes, and index-organized tables to be subdivided into smaller pieces, enabling these database objects to be managed and accessed at a finer level of granularity. Oracle provides a rich variety of partitioning strategies and extensions to address every business requirement. Moreover, since it is entirely transparent, partitioning can be applied to almost any application without the need for potentially expensive and time consuming application changes. Partitioning allows a table, index, or index-organized table to be subdivided into smaller pieces, where each piece of such a database object is called a partition. Each partition has its own name, and may optionally have its own storage characteristics. From the perspective of a database administrator, a partitioned object has multiple pieces that can be managed either collectively or individually. This gives the administrator considerable flexibility in managing partitioned objects. However, from the perspective of the application, a partitioned table is identical to a non-partitioned table; no modifications are necessary when accessing a partitioned table using SQL queries and DML statements. Partitioning Key ======================== Each row in a partitioned table is unambiguously assigned to a single partition. The partitioning key is comprised of one or more columns that determine the partition where each row will be stored. Oracle automatically directs insert, update, and delete operations to the appropriate partition through the use of the partitioning key. When to Partition a Table ========================== Here are some suggestions for when to partition a table: Tables greater than 2 GB should always be considered as candidates for partitioning. Tables containing historical data, in which new data is added into the newest partition. A typical example is a historical table where only the current month's data is updatable and the other 11 months are read only. When the contents of a table need to be distributed across different types of storage devices. When to Partition an Index ============================= Here are some suggestions for when to consider partitioning an index: Avoid rebuilding the entire index when data is removed. Perform maintenance on parts of the data without invalidating the entire index. Reduce the impact of index skew caused by an index on a column with a monotonically increasing value. Partitioned Index-Organized Tables =================================== Partitioned index-organized tables are very useful for providing improved performance, manageability, and availability for index-organized tables. For partitioning an index-organized table: ============================================ Partition columns must be a subset of the primary key columns Secondary indexes can be partitioned (both locally and globally) OVERFLOW data segments are always equi-partitioned with the table partitions See Also: Oracle Database Concepts for more information about index-organized tables System Partitioning System partitioning enables application-controlled partitioning without having the database controlling the data placement. The database simply provides the ability to break down a table into partitions without knowing what the individual partitions are going to be used for. All aspects of partitioning have to be controlled by the application. For example, an insertion into a system partitioned table without the explicit specification of a partition will fail. System partitioning provides the well-known benefits of partitioning (scalability, availability, and manageability), but the partitioning and actual data placement are controlled by the application. See Also: Oracle Database Data Cartridge Developer's Guide for more information about system partitioning Partitioning for Information Lifecycle Management Information Lifecycle Management (ILM) is concerned with managing data during its lifetime. Partitioning plays a key role in ILM because it enables groups of data (that is, partitions) to be distributed across different types of storage devices and managed individually.
Views: 6328 OnLinE ReSoUrCe
Tables and Tables Clusters in Oracle
 
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https://dbagenesis.com/p/oracle-11g-advanced-dba DBA Genesis provides all you need to build and manage effective Oracle technology learning. We designed DBA Genesis as a simple to use yet powerful online Oracle learning system for students. Each of our courses is taught by an expert instructor, and every course is available on demand. Video talks about "what are table clusters inside Oracle database". One of video lessons from our Advanced DBA video course. Have a happy learning!
Views: 3546 DBA Genesis
Table Compression Enhancement in Oracle Database 11g R2
 
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Table Compression: Overview Oracle Database supports three methods of table compression: 1.Basic table compression 2.OLTP table compression Oracle Corporation recommends to compress all data to reduce storage costs. The Oracle database can use table compression to eliminate duplicate values in a data block. For tables with highly redundant data, compression saves disk space and reduces memory use in the database buffer cache. Table compression is transparent to database applications. The table_compression clause is valid only for heap-organized tables. The COMPRESS keyword enables table compression. The NOCOMPRESS keyword disables table compression. NOCOMPRESS is the default. With basic compression, the Oracle database compresses data at the time of performing bulk load using operations such as direct loads or CREATE TABLE AS SELECT. With COMPRESS FOR OLTP, the Oracle database compresses data during all DML operations on the table.
Views: 2198 Saurabh Joshi
Oracle Optimization - Table Partitions
 
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Oracle optimization: create table partitions and Index-Organized Table. Other lessons, visit http://www.learn-with-video-tutorials.com/plsql-oracle-optimization
Oracle - Synonyms
 
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Oracle - Synonyms
Views: 7683 Chris Ostrowski
Oracle Edition-Based Redefinition in 5 minutes
 
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Visit my blog for more Oracle database related posts and presentations: http://db-oriented.com
Views: 2233 Oren Nakdimon
What is High Water Mark(HVM) in oracle and how it effects the performance of queries?
 
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This video tutorial is to understand the concept of a High Water Mark or HVM of a oracle table, also it states the various changes in the HVM when we perform a insert, delete and Truncate operation on the table, and the video also informs why is the truncate operation more advisable and optimized then the delete operation.
Views: 2802 Kishan Mashru
Ode to the Heap table
 
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The heap table.... shouldn't be the only choice for your table structure. So we put it to music :-) ========================================­­­­============== Copyright © 2016 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: 264 Connor McDonald
Reorganizing Tables in Oracle
 
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The clip explains why reorganizing of tables may or may not be required and how to do it. Text version is here: https://uhesse.com/2010/08/23/reorganizing-tables-in-oracle-is-it-worth-the-effort/
Oracle Core,  Лекция 2
 
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Ссылка на файл с презентацией: https://docs.google.com/presentation/d/1MeqLip8n8LWD2rORUMdFTwmHIH7VCVEhB3lrCLwRk2E/edit?usp=sharing (презентация может быть с анимацией) Ссылка на краткий конспект лекции: https://docs.google.com/document/d/13WM7Y_q2PZ_zaM7tk22OJYSKX3BtdJPWUXONpiYKyUQ/edit?usp=sharing 1. История развития СУБД Oracle 2. Схема (Schema). Оператор CREATE USER 3. Таблица (Table). Типы таблиц Oracle 4. Традиционные таблицы (heap organized table) 5. Индекс-таблицы (index organized table) 6. Кластеризованные индекс-таблицы (index clustered table) 7. Кластеризованные хэш-таблицы (hash clustered table) 8. Отсортированные кластеризованные хэш-таблицы (sorted hash clustered table) 9. Вложенные таблицы (nested table) 10. Временные таблицы (temporary table) 11. Внешние таблицы (external table) 12. Rowid 13. Индекс (index). Типы индексов 14. Индексы со структурой B-дерева (b-tree index) 15. Кластерные индексы со структурой B-дерева (b-tree cluster index) 16. Индексы по реверсивным ключам (reverse index) 17. Битовые индексы (bitmap index) 18. Функциональные индексы (functional index) 19. Констрейнт (constraint). Типы констрейнтов. 20. Представление (view). Оператор CREATE OR REPLACE VIEW 21. Последовательность (sequence). Оператор CREATE SEQUENCE 22. Триггер (trigger) 23. Процедура/функция (stored procedure/functions) 24. Пакет (package) 25. DBlink 26. Пространства имен (namespaces) Oracle Database, БД Oracle, вебинар Oracle, презентация Oracle, урок Oracle, лекция Oracle, обучение Oracle
Loading Data From An External Table in Oracle
 
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Ever need to load data from a text file or Excel file into your Oracle database? This video will show you how.
Views: 3542 Pretty Printed
Oracle Tutorial || Oracle|Sql Diff Type of Tables Part-1 by basha
 
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DURGASOFT is INDIA's No.1 Software Training Center offers online training on various technologies like JAVA, .NET , ANDROID,HADOOP,TESTING TOOLS ,ADF,INFORMATICA,TABLEAU,IPHONE,OBIEE,ANJULAR JS, SAP... courses from Hyderabad & Bangalore -India with Real Time Experts. Mail us your requirements to [email protected] so that our Supporting Team will arrange Demo Sessions. Ph:Call +91-8885252627,+91-7207212428,+91-7207212427,+91-8096969696. http://durgasoft.com http://durgasoftonlinetraining.com https://www.facebook.com/durgasoftware http://durgajobs.com https://www.facebook.com/durgajobsinfo......
Oracle ||  Index Organized Tables by siva
 
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DURGASOFT is INDIA's No.1 Software Training Center offers online training on various technologies like JAVA, .NET , ANDROID,HADOOP,TESTING TOOLS , ADF, INFORMATICA,TABLEAU,IPHONE,OBIEE,ANJULAR JS, SAP... courses from Hyderabad & Bangalore -India with Real Time Experts. Mail us your requirements to [email protected] so that our Supporting Team will arrange Demo Sessions. Ph:Call +91-8885252627,+91-7207212428,+91-7207212427,+91-8096969696. http://durgasoft.com http://durgasoftonlinetraining.com https://www.facebook.com/durgasoftware http://durgajobs.com https://www.facebook.com/durgajobsinfo............
27/125 Oracle PLSQL: Index by Tables-Assosiative Arrays 3
 
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تعلم اوراكل حتى الاحتراف Learn Oracle PLSQL EXAM 1Z0-144
Views: 674 khaled alkhudari
SQL: Global Temporary Table (GTT) Part-1
 
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In this tutorial , you'll learn about GTT...
Views: 20115 radhikaravikumar
How to use partitioning to improve performance of large tables
 
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In this video we cover in much more detail the improvement in performance that can be achieved by using partitioning. MS SQL server databases can scale well using this feature. We cover how partitioning a table gives similar performance as a single table with a clustered index, we then explore how adding NC index improve performance of the heap table as well as the partitioned table.
Views: 16454 Jayanth Kurup
Global Temporary Table || Oracle || SQL || in Telugu - Part-1
 
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In this Video, we discuss what is global temporary table, how to create global temporary table.....etc in Telugu
SQL Advanced #8: INSERTs in HEAP Tables
 
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In this session we learn how SQL Server actually inserts a row in a heap table. We learn of all organizational units involved and we also get to know the secret why a heap is so much faster than a clustered index when it comes to insertion.
Views: 507 SQL TV
Creating Tables Without Segments
 
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Understand Deferred Segment Creation Beginning with Oracle Database 11g Release 2, when you create heap-organized tables in a locally managed tablespace, the database defers table segment creation until the first row is inserted. In addition, segment creation is deferred for any LOB columns of the table, any indexes created implicitly as part of table creation, and any indexes subsequently explicitly created on the table. The advantages of this space allocation method are the following: 1.It saves a significant amount of disk space in applications that create hundreds or thousands of tables upon installation, many of which might never be populated. 2.It reduces application installation time.
Views: 279 Saurabh Joshi
Oracle Indexes - Live Demonstration
 
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When is a Full Table Scan faster than an Index Scan? Watch Ross and Jordan act out an Oracle database reading and caching data via both methods, explaining the costs and benefits in simple and easy to understand terms. The demonstration is part of a talk by Ross Leishman of DWS Ltd on the principles of Understanding Indexes for SQL Tuning. The full lecture is at this link: https://www.youtube.com/watch?v=Z4hKomnGHFA 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: 2623 DWS Ltd
Oracle Tutorial || Online Training || Adv Sql | Index Organized Table Part - 1 by basha
 
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DURGASOFT is INDIA's No.1 Software Training Center offers online training on various technologies like JAVA, .NET , ANDROID,HADOOP,TESTING TOOLS ,ADF,INFORMATICA,TABLEAU,IPHONE,OBIEE,ANJULAR JS, SAP... courses from Hyderabad & Bangalore -India with Real Time Experts. Mail us your requirements to [email protected] so that our Supporting Team will arrange Demo Sessions. Ph:Call +91-8885252627,+91-7207212428,+91-7207212427,+91-8096969696. http://durgasoft.com http://durgasoftonlinetraining.com https://www.facebook.com/durgasoftware http://durgajobs.com https://www.facebook.com/durgajobsinfo......
Index Organized Tables
 
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Bases de Datos 2 Index Organized Tables Michelle Cersosimo Fernando Mata
Views: 769 Mich Cersosimo
How to Shrink table in Oracle..
 
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this video will help how to reclaim space from the table.
Views: 1478 oracdb
Database Design 39 - Indexes (Clustered, Nonclustered, Composite Index)
 
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This video covers the basics of indexes. Indexing is an extremely important step of database design. Without Indexes database queries can take a substantial amount of time and hog system resources. The main two classifications of indexes are clustered and non-clustered indexes. Clustered indexes are usually the primary key and determine how the data is actually stored in the table. These are the fastest and most effective. Non-clustered indexes sort a reference to data that is still fast but doesn't actually determine how the data is structured. The best tip I can give you is to use indexes but don't over use them. Having loads of indexes on columns that are barely ever in a where clause or join can bog down the database. This is because every time the table is updated the index must also be updated! When a database looks through a table for certain where conditions on a column that does not have an index, it does an entire table scan. This is not a good practice for large databases (or even small databases but not as bad). With an index the database will do an index seek and quickly find the data you are looking for. Composite indexes consist of two or more columns within one index. Use these when you plan on using the two columns together for a database query WHERE clause. Learn more about indexes here: https://www.calebcurry.com/blogs/database-design/introduction-to-indexes Donate!: http://bit.ly/DonateCTVM2. Courses for Download: http://www.udemy.com/u/calebcurry/ (Use the coupon code "YouTubeDiscount" without the quotes) Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://Twitter.com/calebCurry Subscribe (it's free!): https://www.youtube.com/channel/UCZUyPT9DkJWmS_DzdOi7RIA?sub_confirmation=1 Amazing Web Hosting - https://www.dreamhost.com/r.cgi?1487063 (The best web hosting for a cheap price!)
Views: 84450 Caleb Curry
How Does the Phyiscal Location of Rows Affect Indexes?: Finding All the Red Sweets Part 2
 
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In part one of the red candy series, Chris compared the efficiency of using a index range scan and full table scan to access data. He found that a full table scan was more efficient when fetching more rows than there are table blocks. This analysis made a big assumption however. It worked on the presumption that there was no correlation between the order of candies in the document and which the bags they were in. In this episode tests this assumption. Chris looks at how the physical order of rows in a table can affect the efficiency of indexes on it. He discusses how Oracle tracks this via the clustering factor. ============================ 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: 2918 The Magic of SQL
SQL Advanced #10: UPDATE in HEAP Tables
 
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This time we talk about how updates are performed in heap tables. We learn of the interesting not in-place updates and forwarded rows.
Views: 240 SQL TV
Oracle Database | Bangla Tutorials 14  :: Displaying Data From Multiple Tables (Table Joining))
 
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www.facebook.com/oracle.shohag Email : [email protected] Website : www.oraclebangla.com Topics : Displaying Data From Multiple Tables
Views: 1938 Oracle Bangla
DBMS Indexing: The Basic Concept
 
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A quick introduction to the concept of indexing in RDBMSs
Views: 147172 Brian Finnegan
Create Clustered index on all heap tables by on single click
 
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In this video we Learn us How we can figure all the Heap tables on OUR SQL SERVER CLUSTERS by one click then create clustered index on this HEAP TABLES all this without more effort. To download Stored Procedure :http://sqlserver-performance-tuning.net/?p=5446 & https://mostafaelmasry.wordpress.com/2015/03/11/create-clustered-index-on-all-heap-tables-by-on-single-click-v2/
Views: 99 Mostafa Elmasry
Index Organized Tables
 
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Creadores: Michelle Cersosimo Fernando Mata Universidad de Costa Rica - Bases de Datos 2 2014
Views: 379 Mich Cersosimo
Create Clustered index on all heap tables by on single click
 
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In this video we Learn us How we can figure all the Heap tables on OUR SQL SERVER CLUSTERS by one click then create clustered index on this HEAP TABLES all this without more effort. To download Stored Procedure :http://sqlserver-performance-tuning.net/?p=5446 & https://mostafaelmasry.wordpress.com/2015/03/11/create-clustered-index-on-all-heap-tables-by-on-single-click-v2/
Views: 351 SQL GULF
Clustered vs. Nonclustered Index Structures in SQL Server
 
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Clustered and nonclustered indexes share many of the same internal structures, but they're fundamentally different in nature. Watch Microsoft Certified IT Professional Jon Seigel explain the similarities and differences of clustered and nonclustered indexes, using a real-world example to show how these structures work to improve the performance of SQL queries. Blog post on primary key vs. the clustered index: http://voluntarydba.com/post/2012/10/02/The-Primary-Key-vs-The-Clustered-Index.aspx CREATE INDEX statement reference: http://technet.microsoft.com/en-us/library/ms188783.aspx ALTER INDEX statement reference: http://technet.microsoft.com/en-us/library/ms188388.aspx Index navigation internals by example: http://sqlblog.com/blogs/paul_white/archive/2011/08/09/sql-server-seeks-and-binary-search.aspx Sample index data is from the AdventureWorksLT2008R2 sample database: http://awlt2008dbscript.codeplex.com/releases/view/46169 Visit my channel for more database administration videos: https://www.youtube.com/voluntarydba Subscribe to get notified about my latest videos: https://www.youtube.com/voluntarydba?sub_confirmation=1 Read additional content on my blog: http://voluntarydba.com Follow on Twitter: https://twitter.com/voluntarydba Like on Facebook: https://facebook.com/voluntarydba
Views: 260803 Voluntary DBA
The Optimum Histogram Utility DEMO 1 - Maximize Oracle Performance and SQL Execution Efficiency
 
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Demonstration of the influence of the Optimum Histogram utilities on the estimation accuracy of the Oracle Optimizer in a 11.2.0.1 Oracle Database. Tests highlight the increase in estimation accuracy on the optimizer and impact on execution plan selection. Tests conducted against a numeric column in a heap table and execution plan results and statistics captured to indicate impact on the optimizers execution plan selection of the OHU histograms. IMPORTANT NOTE: This utility is not a substitute for oracle's dbms_stats which calculates highly valuable statistics for oracle objects. It is an add on utility that can be used on columns with skewed distribution. Please see demonstration one for overview of architecture
Views: 4126 Doug Laughlin
What is a HashTable Data Structure - Introduction to Hash Tables , Part 0
 
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This tutorial is an introduction to hash tables. A hash table is a data structure that is used to implement an associative array. This video explains some of the basic concepts regarding hash tables, and also discusses one method (chaining) that can be used to avoid collisions. Wan't to learn C++? I highly recommend this book http://amzn.to/1PftaSt Donate http://bit.ly/17vCDFx
Views: 699755 Paul Programming
Statistics in Oracle and SQL Server
 
01:28:28
The better the information that Oracle and SQL Server have about the data in a database, the better choices they can make on how to execute the SQL. Statistics are Oracle's and SQL Server's chief source of information. If this information is out of date, performance of queries will suffer. In their third live 'Oracle vs. SQL Server' discussion, Jonathan Lewis (Oracle Ace Director, OakTable Network) and Grant Fritchey (Microsoft SQL Server MVP) will look at statistics in Oracle and SQL Server. Do Oracle and SQL Server gather the same information? What does each optimizer use this information for? And how can Oracle and SQL Server administrators override the defaults for better (or worse) performance? These are just some of the questions that Jonathan and Grant will try to answer in another not-to-be-missed session. As before, this will be a live discussion with limited supporting slides, and will conclude with a Q+A session with Jonathan and Grant. Be prepared for a lively exchange that will not only entertain, but will teach you key concepts on Oracle and SQL Server. For our complete archive please go to http://www.red-gate.com/oracle-webinars
Views: 2303 Redgate Videos
07 06 Index Skip Scan Operations
 
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ORACLE
Views: 694 oracle ocm
SQL Server Execution Plan Operators
 
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Table scans, clustered index scans, merge joins, sorts, and more.
Views: 24972 Brent Ozar Unlimited
Part 21 - Databases - Cluestered Indexes vs. Non Clustered Indexes
 
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- Indexes in Books - Indexed data in Dictionary, Telephone Directory - Indexes in databases (Clustered Index, Non-Clustered Index) - Heap table vs. Index Table - CREATE/DROP Clustered Index - CREATE/DROP non-Clustered Index Script file: https://github.com/bilalshahzad139/LearnInUrdu/blob/master/Databases/Scripts/21_Indexes.sql
Views: 309 Learn In Urdu