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Indexing in Oracle :B-Tree,Bitmap Indexing
 
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This Video is the 1st tutorial in the video series Indexing in Oracle , The video series explains in detail, What are indexes?It's types, what index should be used in which scenario and other important thing in basic terminology. Note :You may want to watch the video with a higher playback speed(1.25 if it suits you more)
Views: 15288 Tech Coach
Oracle || Indexes Part-1 by dinesh
 
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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 Indexes - Beginner
 
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Oracle Indexes - Beginner
Views: 65698 Chris Ostrowski
PL/SQL Collections
 
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Held on August 7 2018 Collections are PL/SQL's version of arrays and there are three types: associative arrays, nested tables, varrays. They are used in many performance features of PL/SQL, such as bulk processing, as well as table functions. Steven Feuerstein uses them all the time and thinks you should, too. He kicked off this Office Hours with some of his favorite collections features/usages, and then he and Chris Saxon answered questions on measuring PGA, executing DML in parallel, and more. 2:30 Steven's favorite collection things 3:20 First a little quiz! 7:56 Banish row-by-row SQL processing 14:06 String-indexed collections 17:19 Nested collections 20:42 Table functions 26:18 Q&A 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: 1309 Oracle Developers
Collections in PL/SQL | Oracle PL/SQL Tutorial Videos | Mr.Vijay Kumar
 
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Collections in PL/SQL PLSQL Tutorial
Views: 28812 Naresh i Technologies
Types of Indexes (A B-tree index,A bitmap index )
 
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Hi guys today is very most important topic in oracle is INDEXES help to increase performance at the time of search and modification into table records. #TypesofIndexes #B-treeindex#bitmapindex
Views: 28917 Oracle World
Local Vs Global Partitioned Index in Oracle 11g
 
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The Video Explains the difference between Local Partitioned Indexes(Prefixed vs Non Prefixed Indexes). and Global Partitioned Index along with the challenges in maintaining Global partitioned Indexes when the underlying tables partitioned is dropped/truncated/Merged/Moved. Local Partitioned Index Shares the same boundaries as the table and are in the same number as table partitions they are widely used in DSS and DWH systems. While Global Partitioned Index are predominantly used in OLTP systems
Views: 6482 Tech Coach
Which Order Should Columns Go in an Index?: Finding All the Red Sweets Part 4
 
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When you create an index on multiple columns there's an important question you need to answer: In which order should you list the columns? This video looks at some of the factors you should consider to help answer this question. ============================ 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: 4166 The Magic of SQL
Intuition Behind Oracle Index
 
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How index helps in performance For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=6 Full Course Experience Includes 1. Access to course videos and exercises 2. View & manage your progress/pace 3. In-class projects and code reviews 4. Personal guidance from your Mentors
Views: 13905 Oresoft LWC
B-Tree Indexes
 
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In this video, I'd like to take a look at B-tree indexes and show how knowing them can help design better database tables and queries.
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: 8127 The Magic of SQL
DBMS Indexing: The Basic Concept
 
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A quick introduction to the concept of indexing in RDBMSs
Views: 164417 Brian Finnegan
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: 2691 DWS Ltd
07 03 Bitmap Indexes
 
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ORACLE
Views: 8823 oracle ocm
SQL: Types of Indexing
 
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In this tutorial, you'll learn how to make use of different indexes...
Views: 32745 radhikaravikumar
ADS1: Hash tables for indexing
 
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We discuss how a hash table can hold a k-mer index, as well as how to query it. Course page: https://www.coursera.org/course/ads1.
Views: 4928 Ben Langmead
What Impact Do Indexes Have on Inserts?: Finding All the Red Sweets Part 0
 
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Creating indexes can improve query performance. Oracle must maintain the indexes however. This increases the work it must do whenever you modify data in indexed columns. In this video Chris looks at this overhead using a real world analogy - recording the color of all the candies stored in party bags! ============================ 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: 2703 The Magic of SQL
BITMAP  and  BITMAP JOIN INDEX IN ORACLE explained
 
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The video explains BITMAP and BITMAP JOIN INDEX IN ORACLE and when you should create them on a column. BITMAP INDEXES should be dealt with carefully as they can lead to serious performance issues if the table is updated by multiple processes in parallel. Indexing Basics :https://www.youtube.com/watch?v=0X9bbtwTnuE&t=1095s Star and snowflake Schema :https://www.youtube.com/watch?v=Qq4yhhAk9fc&t=17s
Views: 4384 Tech Coach
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 - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 95734 Caleb Curry
Why do we need Bit Map Index
 
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Internals of Bitmap Indexes in Oracle For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=6 Full Course Experience Includes 1. Access to course videos and exercises 2. View & manage your progress/pace 3. In-class projects and code reviews 4. Personal guidance from your Mentors
Views: 44850 Oresoft LWC
how to declare the index by table in PLSQL (Oracle)?
 
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in this video, you will learn how to declare the index by table and how to use the exist function ?
Views: 4315 MahmoudRFarra
Oracle Database Indexes: Myths, Tips and Tricks
 
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In this tutorial, OCM John Watson will - via demonstrations - debunk these myths: Myth #1: Oracle Database does not index NULL Myth #2: A search that includes wildcards can't use an index if the wildcard precedes the string. Myth #3: Oracle will not use a function-based index unless the FBI is coded in the predicate. Myth #4: Indexes always help. The more indexes the better. See http://skillbuilders.com/free-oracle-tutorials for gigabytes of free Oracle video tutorials.
Views: 16234 SkillBuilders
Oracle || Indexes Part-2 by dinesh
 
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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......
SQL: Indexes - Bit Map & B-trees
 
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In this tutorial, you'll learn when to use b-tree and bitmap index
Views: 53853 radhikaravikumar
Multiple Indexes on the Same Set of Columns
 
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This video demonstrates how you can use invisible indexes to allow multiple indexes on the same set of columns. Multiple indexes on the same column set is a new feature in Oracle 12c. For more information see: https://oracle-base.com/articles/12c/multiple-indexes-on-same-set-of-columns-12cr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Scott Spendolini Blog: http://spendolini.blogspot.co.uk/ Twitter: https://twitter.com/sspendol Website: http://www.sumnertech.com/ Cameo appearances are for fun, not an endorsement of the content of this video.
Views: 1329 ORACLE-BASE.com
Stop Rebuilding Global Indexes! Oracle 12c Global Index Maintenance
 
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Stop rebuilding Global Indexes! Stop worrying about invalidating Global Indexes! Oracle 11g gave us "UPDATE GLOBAL INDEXES". 12c provides a huge improvement: orphaned_entries! In this tutorial, Oracle Certified Master John Watson demonstrates how 11g and 12c handle Global Index maintenance with orphaned entries and overnight maintenance job PMO_DEFERRED_GIDX_MAINT_JOB.
Views: 2452 SkillBuilders
skip_unusable_indexes is NOT skipping unusable indexes!
 
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blog: connor-mcdonald.com Highlights from the April DBA Office Hours session. Office Hours is 100% free Q&A sessions held every month by Oracle experts to help you succeed with the Oracle suite of technologies. Music: Smells Like Summer - Del (Vlog Music No Copyrighted) Video Link: https://youtu.be/IrkMsqcOjGU
Views: 302 Connor McDonald
PART 5.3 Indexing in dbms in hindi basics of indexing in dbms primary secondary clustered
 
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Views: 162692 KNOWLEDGE GATE
Indexing JSON Data in Oracle Database 12c
 
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This video gives an overview of indexing JSON data in Oracle database 12c. For more information see: https://oracle-base.com/articles/12c/indexing-json-data-in-oracle-database-12cr1 Website: https://oracle-base.com Blog: https://oracle-base.com/blog Twitter: https://twitter.com/oraclebase Cameo by Bertrand Drouvot : Blog: https://bdrouvot.wordpress.com/ Twitter : https://twitter.com/BertrandDrouvot Cameo appearances are for fun, not an endorsement of the content of this video. All trademarks, product names and logos are the property of their respective owners.
Views: 1749 ORACLE-BASE.com
Database Design 21 - Primary Key Index
 
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Donate!: http://bit.ly/DonateCTVM2. Primary key will automatically create an index used for database optimization! More content: http://CalebCurry.com Courses for Download: http://www.udemy.com/u/calebcurry/ Facebook: http://www.facebook.com/CalebTheVideoMaker Google+: https://plus.google.com/+CalebTheVideoMaker2 Twitter: http://Twitter.com/calebCurry Subscribe (it's free!): http://bit.ly/PqPyvH Amazing Web Hosting - http://bit.ly/ccbluehost (The best web hosting for a cheap price!)
Views: 17488 Caleb Curry
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: 294690 Voluntary DBA
SQL Server training and interview question:-What is index and how does it make your search faster ?.
 
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For more such videos visit http://www.questpond.com See our other Step by Step video series below :- Learn Angular tutorial for beginners https://tinyurl.com/ycd9j895 Learn MVC Core step by step :- http://tinyurl.com/y9jt3wkv Learn MSBI Step by Step in 32 hours:- https://goo.gl/TTpFZN Learn Xamarin Mobile Programming Step by Step :- https://goo.gl/WDVFuy Learn Design Pattern Step by Step in 8 hours:- https://goo.gl/eJdn0m Learn C# Step by Step in 100 hours :- https://goo.gl/FNlqn3 Learn Data structures & algorithm in 8 hours :-https://tinyurl.com/ybx29c5s Learn SQL Server Step by Step in 16 hours:- http://tinyurl.com/ja4zmwu Learn Javascript in 2 hours :- http://tinyurl.com/zkljbdl Learn SharePoint Step by Step in 8 hours:- https://goo.gl/XQKHeP Learn TypeScript in 45 Minutes :- https://goo.gl/oRkawI Learn webpack in 50 minutes:- https://goo.gl/ab7VJi Learn Visual Studio code in 10 steps for beginners:- https://tinyurl.com/lwgv8r8 Learn Tableau step by step :- https://tinyurl.com/kh6ojyo Preparing for C# / .NET interviews start here http://www.youtube.com/watch?v=gaDn-sVLj8Q In this SQL Server training video we will understand what are indexes and how they make your search faster. We also run through the fundamentals of B-tree or balanced tree structure. Its also one of those favourite SQL Server interview questions which is asked in SQL Server interviews. We are also distributing a 100 page Ebook "Sql Server Interview Question and Answers". If you want this ebook please share this video in your facebook/twitter/linkedin account and email us on [email protected] with the shared link and we will email you the PDF.
Views: 231601 Questpond
PART 5.4 Types of Indexing in DBMS in HINDI different classification of indexing physical secondary
 
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Views: 104054 KNOWLEDGE GATE
Oracle Tutorial - 10 - indexes
 
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Oracle PL/SQL Query Database. Check more videos on IT courses on iAspireAcademy.org
Views: 22504 iAspireAcademy
What is Indexing in DBMS in HINDI
 
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Find the notes of DBMS INDEXING AND HASHING in this link - https://viden.io/knowledge/dbms-indexing-and-hashing?utm_campaign=creator_campaign&utm_medium=referral&utm_source=youtube&utm_term=ajaze-khan-1 Best Buy Links (affiliate): SQL The Complete Reference https://amzn.to/2NAfr2G SQL Cookbook (Covers SQL Server, PostgrSQL, Oracle, MySQL, And Db2) https://amzn.to/2MhU6Xl Beginning SQL Queries https://amzn.to/2NzaAPj SQL, PL/SQL the Programming Language of Oracle https://amzn.to/2QjIyWH SQL in easy steps https://amzn.to/2x73t6G T-SQL Fundamentals https://amzn.to/2NywZfC Microsoft SQL Server 2012 Step By Step https://amzn.to/2O8BMBI -----------------------------------
Views: 10160 LearnEveryone
Indexing in dbms | dbms indexing in hindi | Introduction to Indexing | DBMS Lectures in Hindi #85
 
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Welcome to series of gate lectures by well academy GATE Practice Book Purchase Link ( ACE Academy ) https://goo.gl/jESdtD GATE Practice Book Purchase Link ( Made Easy ) https://goo.gl/zUU5Vn Here are some more GATE lectures by well academy SQL create table in hindi | SQL tutorial in hindi | DBMS Lectures in hindi #72 : https://youtu.be/Pm8XAQYDBGw constraints in dbms | constraints in sql in hindi | DBMS Lectures in Hindi #73 : https://youtu.be/kevkLGrJvUg sql insert command | sql insert into table | sql insert query | DBMS Lectures in hindi #74 : https://youtu.be/lsxyUFjh148 SQL Delete row | SQL Update Query | sql queries tutorial in hindi | DBMS Lectures in hindi #75 : https://youtu.be/KuUPDpYKtT0 referential integrity constraint in dbms | referential integrity in sql | DBMS Lectures in Hindi #76 : https://youtu.be/UT_8T7EL2Og SQL Alter command | sql alter table add column | dbms queries tutorial | DBMS Lectures in Hindi #77 : https://youtu.be/uCjKTMdy094 sql select query | sql select statement | sql select from multiple tables | dbms Lectures #78 : https://youtu.be/-Lo6KHlkiQk create view in sql | view in sql in hindi | View Operation in SQL | DBMS Lectures in Hindi #79 : https://youtu.be/YURtgFm0cIk SQL Pattern Matching | LIKE Condition | DBMS Gate Lectures in hindi #80 : https://youtu.be/goMsplCB730 arithmetic operators in SQL | SQL Arithmatic Operators | DBMS Lectures in Hindi #81 : https://youtu.be/kAfHeYfTXFI SQL order by | sql order by tutorial | dbms queries tutorial | DBMS Lectures in Hindi #82 : https://youtu.be/E8p1HzzCUW0 file organization in dbms | file organization in database | file organization in dbms in hindi #83 : https://youtu.be/ofslaTIpT8A organization of records in files in dbms | Ordered and Unordered | DBMS Lectures in hindi #84 : https://youtu.be/AsrQuq53xRI Facebook Me : https://goo.gl/2zQDpD Click here to subscribe well Academy https://www.youtube.com/wellacademy1 GATE Lectures by Well Academy Facebook Group https://www.facebook.com/groups/1392049960910003/ Thank you for watching share with your friends Follow on : Facebook page : https://www.facebook.com/wellacademy/ Instagram page : https://instagram.com/well_academy Twitter : https://twitter.com/well_academy file indexing in dbms, indexing in dbms in hindi, indexing in dbms with examples, types of indexing in dbms, dbms indexing gate, dbms indexing, dbms indexing gate, dbms indexing in hindi, indexing in dbms in hindi, indexing structures in dbms, indexing in dbms, indexing in dbms for gate, indexing in dbms in english, multilevel indexing in dbms,
Views: 15003 Well Academy
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.
COL8: Non-Sequential Indexing in Associative Arrays
 
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This lesson explores how to take advantage of the wide range of integer index values and the possible sparseness of associative arrays to construct and use non-sequentially filled collections. This video was taken from PLSQLChannel.com, originally recorded before Steven Feuerstein re-joined Oracle in March 2014. ======================================== 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.
Internals of Binary Tree Indexes
 
09:52
Binary Tree Indexes For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=6 Full Course Experience Includes 1. Access to course videos and exercises 2. View & manage your progress/pace 3. In-class projects and code reviews 4. Personal guidance from your Mentors
Views: 16776 Oresoft LWC
What is Index Scan ,Index Seek and Table Scan?
 
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An index scan or table scan is when SQL Server has to scan the data or index pages to find the appropriate records. index seek happens when data is searched among the index.Please watch full video for detail.
Views: 19749 SqlIsEasy
Oracle Indexes Lesson 2 What and Why
 
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What is an Oracle B-Tree Index? Why do we create them? Learn the answers here. See all lessons, FREE, at http://www.skillbuilders.com/all-about-oracle-btree-indexes.
Views: 448 SkillBuilders
Indexing within Relational Databases SQL Server / Oracle / Others
 
09:21
SQL Server and Relational Database Indexing - If you enjoyed the video, please +1 it or subscribe for more to follow! Get SQL Server with BI - Free Express (Limits to 4 Gigs of Ram on Processing) http://www.microsoft.com/download/en/details.aspx?id=25174
Splitting and Spawning in B- Tree Index : How Blocks are stored
 
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The video explains how Btree index is stored in blocks and when data is inserted into the underlying table how additional blocks are added to the index which leads to index Spawning and block spliting
Views: 1792 Tech Coach
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: 7138 Md Arshad
When to use Oracle Database Bitmap Indexes Lesson 1
 
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This tutorial will identify some use cases for Oracle bitmap indexes, including some of the more advanced capabilities. See all lessons, free, at http://www.skillbuilders.com/when-to-use-oracle-bitmap-indexes. Indexing your Oracle Database for best performance? There are cases, depending on data structures and queries, where b-tree indexes are not useful (e.g. scan access paths perform inadequately). In these cases, bitmap indexes may be a better solution. Bitmap indexes are a powerful tool, but they need to be used with care. Inappropriate use may cause problems worse than those they solve. The tutorial covers somewhat more advanced cases such as using bitmap join indexes to denormalize a snowflake schema, and to enable star transformations in queries that join fact tables to several dimension tables. This training will benefit any Oracle DBA administering a Data Warehouse or VLDB and "power" developers working in same. Instructor: Oracle Certified Master DBA John Watson, SkillBuilders
Views: 597 SkillBuilders
COL9: Working with String-indexed Associative Arrays
 
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One of my favorite features of associative arrays is the ability to index by string, in addition to integer. You can have all sorts of fun! This video was taken from PLSQLChannel.com, originally recorded before Steven Feuerstein re-joined Oracle in March 2014. ======================================== 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.

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