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Multi-User Concurrent Transactions in an Oracle Database - DBArch  Video 12
 
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This video explains how an Oracle Database manages multi-user concurrent transactions. A database a multi-user environment and this video tells you how redo and data files are managed by an Oracle Instance / Database. 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: 6121 Ramkumar Swaminathan
Oracle 12c_Lesson10: Managing Data Concurrency
 
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Oracle Database 12c Administration Workshop
Views: 72 B N H
TUTORIAL - Managing Data & Concurrency Oracle 11g Enterprise Edition
 
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It's my colleges mid semester homework Part 2 Music Sad Machine covered by Boney
Views: 185 Sloogy Panda
Database Tutorial 16 - What is Data Concurrency?
 
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Database Tutorial. This video is about Database Fundamentals. I hope this series of videos can help those who want to be Database Professionals. I will cover various database technologies including Oracle Database, Microsoft SQL Server database and Sybase. Video: What is Data Concurrency? (Video 16 in the Database Tutorial Series) (Common for Oracle/Microsft SQL Server/Sybase /MySQL)
Views: 6502 Sam Dhanasekaran
0606 How Oracle Manages Concurrency
 
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ORACLE
Views: 151 oracle ocm
Real-World Performance - 13 - Large Dynamic Connection Pools - Part 1
 
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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 large dynamic connection pools affect 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.
APM SuiteApp: How to Monitor your Account Concurrency Usage
 
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Learn how to monitor and plan your usage of concurrent web service and RESTlet requests by using the Concurrency Monitor in the Application Performance Management (APM) SuiteApp. ================================= To improve the video quality, click the gear icon and set the Quality to 1080p/720p HD. For more information, see http://www.oracle.com/goto/oll and http://docs.oracle.com Copyright © 2018 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.
DB Transactions, Concurrency and Consistency
 
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A demonstration of what a database transaction is, as well as the difference between concurrent retrievals and consistent retrievals. The demonstration is done using the Progress OpenEdge RDBMS and the Progress OpenEdge ABL. Although I am good with maths, doing some simple calculations on the spot while recording at 11 pm did take its toll on my mathematical credibility. :-)
Views: 374 Simon Prinsloo
ORACLE - Managing Data and Concurrency
 
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Tugas UTS Mata Kuliah Manajemen Basis Data 2016 S1 Sistem Informasi Telkom University
Database 12c Managing Space
 
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Oracle DB 12c Managing Space
Views: 97 Ora Tube
oracle world - Row Level Lock in Oracle database
 
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Hello friends in this video we learn how the lock occur in database automatically when multiple user modified the same transaction in their session. #RowLevelLock Oracle database Unbeatable,Unbreakable Platform..
Views: 6799 Oracle World
What is a Database Control - Database Tutorial 44 (Oracle DBA tutorial)
 
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Video 44 - What is a Database Control? (Part of Oracle DBA tutorial) A database control is a Web Interface provided that comes along with Oracle 11g. When an Oracle 11g database is installed in a Windows PC, the installer also installs Oracle Database Control. Most of the Database Administration Tasks can be performed sing the Database Control. It is kind of a precursor to Oracle Enterprise Manager. This video gives a quick overview of an Oracle Database Control.
Views: 1986 Sam Dhanasekaran
Oracle DBA 11g Tutorial in Bangla: Lesson#9 Managing Data Concurrency
 
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This is Programming language channel. this channel name is leen's teach channel.
Views: 46 Leen's Tech
Locks   Blocks   Deadlocks
 
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Understanding Locks, Blocks and dead locks in oracle database.
Views: 3331 OrSkl Academy
Oracle Enterprise Manager 12c System Monitoring Plug-in for IBM DB2
 
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The Oracle Enterprise Manager System Monitoring Plug-in for IBM DB2 Database (version 12.1.0.4.0) delivers comprehensive availability, performance and configuration information for IBM DB2 Universal Database. By combining IBM DB2 monitoring with the richest and most comprehensive management of Oracle systems, Oracle Enterprise Manager significantly reduces the cost and complexity of managing IT environments that have a mix of IBM DB2 and Oracle technologies. Administrators running packaged and custom applications on top of Oracle systems and IBM DB2 can now centralize all of the monitoring information in the Oracle Enterprise Manager Cloud Control, model and view the complete topology of their applications, and perform comprehensive root cause analysis. Database administrators managing Oracle Databases and IBM DB2 can perform proactive monitoring and detailed configuration analysis for IBM DB2, while consolidating all of the management information about their database environment in the Oracle Enterprise Manager Console. ================================= For more information, see http://www.oracle.com/goto/oll 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.
[Oracle 12C] - Managing Data Concurrency | Học lập trình
 
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Managing Data Concurrency Video được trích từ khóa học Oracle Database 12c - Program with PL/SQL tại TTTH: http://csc.edu.vn/lap-trinh-va-csdl/Oracle-12C-PL-SQL_88 Video giảng dạy thuộc Trung Tâm Tin Học Trường ĐH Khoa Học Tự Nhiên TPHCM. Website: http://csc.edu.vn/lap-trinh-va-csdl FB: https://www.facebook.com/Trungtamtinhockhtn Có thể bạn quan tâm: https://www.youtube.com/watch?v=OAnBscTGxhk&index=1&list=PLZdjH1eniL7UtJCKxFXB9SSieq3v2N6km
Views: 704 Học Lập Trình
Oracle Transaction Management
 
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Oracle Transaction Management
Views: 360 TechnologyFirst
Oracle Locks Explained Part 1
 
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Oracle Locks explained. How to Kill a User session in oracle database- Neway IT Solutions
Views: 1937 NewayITSolutions LLC
INFT3007 - Lecture 10 (Transactions and Concurrency Control - Part 2)
 
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Deadlocks Deadlock Detection & Prevention Phantoms and Dynamic Databases Multiple Granularity Locking SQL Server Concurrency Control Demo
Views: 2445 Rukshan Athauda
JSR 236: Introduction to Concurrency Utilities for Java EE 1.0
 
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Concurrency Utilities for Java EE is a new addition to the Java EE 7 platform. It adds asynchronous capabilities to Java EE application components through APIs that are mainly extensions of the concurrency utilities in Java SE. It provides a standard way for Java EE applications to submit asynchronous tasks and obtain managed threads from the Java EE application servers. This session provides an overview of Concurrency Utilities for Java EE 1.0. It discusses the four types of managed objects provided—ManagedThreadFactory, ManagedExecutorService, ManagedScheduledExecutorService, and ContextService—and walks through some code examples to illustrate how they can be used in an Java EE application. Authors: Fred Rowe Fred is the WebSphere Architect for a number of Application Server components including those responsible for JEE managed concurrency, JCA (Java Connector Architecture), and database connectivity and connection management. Fred has worked at IBM for 10 years in various development roles including Senior I/T architect in the GBS division on wireless technologies and RFID, and then in the SWG division on the WebSphere Application Server. Prior to IBM, he worked as a Senior Software Engineer in wireless and telecom doing application and network management development. View more trainings by Fred Rowe at https://www.parleys.com/author/fred-rowe Anthony Lai Anthony Lai is a UX Architect at Oracle Corporation. He has been designing and building enterprise software for more than a decade. Working at Oracle and Taleo, he has gained deep experience with many different platforms, architectures and technologies. Through his work, he has developer relationships with users, and he strives to build useful software that helps people do their jobs more efficiently. He holds two Master’s degrees from Stanford University and since 2007 has specialized in emerging technologies, building the first social networks at Oracle, including Oracle Mix, building the first Android apps at Oracle and pioneering new interfaces like Leap Motion and Google Glass. View more trainings by Anthony Lai at https://www.parleys.com/author/anthony-lai Find more related tutorials at https://www.parleys.com/category/developer-training-tutorials
Views: 1039 Oracle Developers
Oracle Enterprise Manager 12c: Use Active Session History (ASH) Analytics
 
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This demonstration shows you how to monitor your database using Active Session History (ASH) Analytics in Oracle Enterprise Manager Cloud Control 12c. 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.
Transactions and Concurrency Control Patterns by Vlad Mihalcea
 
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Transactions and Concurrency Control are very of paramount importance when it comes to enterprise systems data integrity. However, this topic is very tough since you have to understand the inner workings of the database system, its concurrency control design choices (e.g. 2PL, MVCC), transaction isolation levels and locking schemes. In this presentation, I'm going to explain what data anomalies can happen depending on the transaction isolation level, with references to Oracle, SQL Server, PostgreSQL, and MySQL. I will also demonstrate that database transactions are not enough, especially for multi-request web flows. For this reason, I'm going to present multiple application-level transaction patterns based on both optimistic and pessimistic locking mechanisms.
Views: 6384 Devoxx
Oracle Database Memory Serialization Control (latches & mutexes)
 
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Oracle Database Memory Serialization Control (latches & mutexes) teaches Oracle DBAs the ends and outs about Oracle memory structure control. Oracle effectively creates the illusion of simultaneous memory structure manipulation. And it's our job to ensure this illusion remains a mystery to our users. To help you keep this illusion real, in this seminar I will lead you into the mysterious world of Oracle memory structure serialization control by exploring latches and mutexes: what they are, how they work, how we monitor their performance, how we tell if there is a significant problem and how we systematically diagnose the situation. I think you will soon understand why I think Oracle serialization control rocks! For details go to http://www.orapub.com/video-seminar-serialization-control PART ONE of this seminar focuses on why latches and mutexes are so important to Oracle's operations and how Oracle uses latches and mutexes in its kernel code. I also dig into how Oracle's time model relates to latching. This enables you to properly diagnosis and communicate to others why or why not latches/mutexes are a significant performance issue. Finally, I get into how Oracle increases concurrency by effectively using multiple latches of the same type to increase memory structure concurrency. It's fascinating and very important for DBAs who want to pursue a career focused on Oracle performance tuning. PART TWO begins by focusing on advanced latch spin control and detailing three ways to identify the problem latch. Then I'll begin digging deep into mutexes, including why they are important, why Oracle began using them and the acquisition algorithm. I'll even get into advanced mutex control using Oracle instance parameters. We will observe Oracle using mutexes by operating system tracing Oracle processes. It's pretty cool and key for any DBA who wants to become a performance expert. What You Will Learn In Part 1 & 2 - Why Oracle processes must ensure serial access control to Oracle memory structures - What are Oracle latches and mutexes - How Oracle latches are different from mutexes - The latch and mutex acquisition algorithms - How L&M activity relates to Oracle's time model - How to monitor for real L&M problems using Oracle's time model and an AWR report - Steps to methodically approach diagnosing and coming up with performance solutions - The differences between latches and mutexes - How Oracle implement mutexes in its library cache - How to use advanced latch spin control - What options DBAs have to influence mutex behavior L&M = Latches And Mutexes Modules Part 1: 060 Oracle Serialization Control - Part 1 1. Why the simultaneous memory structure illusion must exist and why it works so well 2 Oracle processes, L&M and memory structures, the general L&M acquisition algorithm 3 L&M time accounting and how this relates to the Oracle time model and the AWR report 4. Oracle latch specifics: concurrency limitations, child latches, multiple latches and how latches "back off." Part 2: 062 Oracle Serializatoin Control - Part 2 1. Using latch specific spin count control to your advantage and three ways to identify the problem latch 2. Why mutexes are advantageous to increase concurrency 3. Detailing the Oracle mutex algorithm 4. Advanced mutex control and observering Oracle mutex usage in detail For more information to go www.orapub.com
Views: 2604 OraPub, Inc.
Simplified DBA-019-Data Concurrency and Locks
 
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DATA CONCURRENCY More than one user connections ( session ) can access same data. For example user1 and user2 can view same employee information at the same time. But not two users can modify same data in one time. This is maintained by oracle lock mechanism. Before the database allows a session to modify data, the session must first lock the data that is being modified. A lock gives the session exclusive control over the data so that no other transaction can modify the locked data until the lock is released. Transactions can lock individual rows of data, multiple rows, or even entire tables. Oracle Database supports both manual and automatic locking. Automatically acquired locks always choose the lowest possible level of locking to minimize potential conflicts with other transactions. Demo: User1 is modifying an employee. User1 session will acquire a lock on the row. Same time user2 is trying to modify same employee. Since User1 has acquired lock, user2 has to wait until user1 releases the lock. Manual locking is possible. A user can place a lock manually as follows: LOCK TABLE mytable1 IN EXCLUSIVE MODE; With the preceding statement, any other transaction that tries to update a row in the locked table must wait until the transaction that issued the lock request completes. EXCLUSIVE is the strictest lock mode. The following are the other lock modes: ROW SHARE: Permits concurrent access to the locked table but prohibits sessions from locking the entire table for exclusive access ROW EXCLUSIVE: Is the same as ROW SHARE, but also prohibits locking in SHARE mode. The ROW EXCLUSIVE locks are automatically obtained when updating, inserting, or deleting data. ROW EXCLUSIVE locks allow multiple readers and one writer. SHARE: Permits concurrent queries but prohibits updates to the locked table. A SHARE lock is required (and automatically requested) to create an index on a table. However, online index creation requires a ROW SHARE lock that is used when building the index.
Differences between Shared and Exclusive Lock in oracle database
 
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Hello friends in this video we learn how the lock occur in database automatically when multiple user modified the same transaction in their session. #SharedandExclusiveLock Oracle database Unbeatable,Unbreakable Platform..
Views: 9789 Oracle World
Oracle 11g DBA Bangla Tutorial |Ch10_1- Data & Concurrency | Database Management System | Training
 
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See the Description for required source code and links Oracle DBA Tutorial Source Code of Oracle Database Training: https://drive.google.com/open?id=0Bz0MNaVyRm3lZXJoUlhVN0ZJd28 Chapter-10 : Managing Data & Concurrency. In this chapter, you will know about what is data, data transaction, procedure, pl sql function, trigger, commit, rollback, savepoint, pl sql objects, dml, deadlock.The procedure, pl sql function, trigger are important object in oracle. Oracle DBA training including database design is special computer training designed online courses on Database Management System. It is fully bangla tutorial of Oracle 11g database administration. It will be much helpful for every database programmer and administrator. Subscribe this channel to watch my all tutorials on PHP, MYSQL, Javascript, Linux, Networking, Access Programming & Microsoft Office, C++, HTML, CSS. Oracle Database Administration PDF eBook Link : https://drive.google.com/open?id=0Bz0MNaVyRm3la2dYR1A1SlRiVlk All Source Codes & Required Documents together are found in the link: https://drive.google.com/open?id=0Bz0MNaVyRm3ldTUwaTd4cjVka0k Oracle DBA Tutorials: https://www.youtube.com/playlist?list=PLUYY2piVmub6bRM0ScQMNnbyH66yrh1cf Oracle - SQL Tutorial link: https://www.youtube.com/playlist?list=PLUYY2piVmub7QL0ET2_eg4D_SV3AOsPHT Channel Link: http://www.youtube.com/channel/UCT_fWLNX67sDH3W3FZ1wxLg?sub_confirmation=1 Required Document Link : https://drive.google.com/open?id=0Bz0MNaVyRm3lTWNhMURIbFV1MjA FB Page: https://www.facebook.com/BanglaTutorial24 FB Group: https://www.facebook.com/groups/banglatutorial24/ N.B: In the video tutorial, I have tried to describe about pl sql, data transaction, procedure, pl sql function, trigger, data manipulation languages - DML in oracle database. [SQL TUTORIAL, DATABASE MANAGEMENT SYSTEM, BANGLA TUTORIAL, TRAINING, DATABASE, ORACLE DBA]
Views: 330 MD. SHARIFUL ALAM
Oracle 11g DBA Bangla Tutorial |Ch10_4 - Data & Concurrency | Database Management System | Training
 
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See the Description for required source code and links Oracle DBA Tutorial Source Code of Oracle Database Training: https://drive.google.com/open?id=0Bz0MNaVyRm3lZXJoUlhVN0ZJd28 Chapter-10 : Managing Data & Concurrency. In this chapter, you will know about what is data, data transaction, procedure, pl sql function, trigger, commit, rollback, savepoint, pl sql objects, dml, deadlock.The procedure, pl sql function, trigger are important object in oracle. Oracle DBA training including database design is special computer training designed online courses on Database Management System. It is fully bangla tutorial of Oracle 11g database administration. It will be much helpful for every database programmer and administrator. Subscribe this channel to watch my all tutorials on PHP, MYSQL, Javascript, Linux, Networking, Access Programming & Microsoft Office, C++, HTML, CSS. Oracle Database Administration PDF eBook Link : https://drive.google.com/open?id=0Bz0MNaVyRm3la2dYR1A1SlRiVlk All Source Codes & Required Documents together are found in the link: https://drive.google.com/open?id=0Bz0MNaVyRm3ldTUwaTd4cjVka0k Oracle DBA Tutorials: https://www.youtube.com/playlist?list=PLUYY2piVmub6bRM0ScQMNnbyH66yrh1cf Oracle - SQL Tutorial link: https://www.youtube.com/playlist?list=PLUYY2piVmub7QL0ET2_eg4D_SV3AOsPHT Channel Link: http://www.youtube.com/channel/UCT_fWLNX67sDH3W3FZ1wxLg?sub_confirmation=1 Required Document Link : https://drive.google.com/open?id=0Bz0MNaVyRm3lTWNhMURIbFV1MjA FB Page: https://www.facebook.com/BanglaTutorial24 FB Group: https://www.facebook.com/groups/banglatutorial24/ N.B: In the video tutorial, I have tried to describe about pl sql, data transaction, procedure, pl sql function, trigger, data manipulation languages - DML in oracle database. [SQL TUTORIAL, DATABASE MANAGEMENT SYSTEM, BANGLA TUTORIAL, TRAINING, DATABASE, ORACLE DBA]
Views: 214 MD. SHARIFUL ALAM
Deadlock? in oracle database
 
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Hello friends in this video we learn how the lock occur in database automatically when multiple user modified the same transaction in their session. #Deadlock Oracle database Unbeatable,Unbreakable Platform..
Views: 7470 Oracle World
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: 3405 Redgate Videos
Oracle Enterprise Manager - Highlighted Questions and Extended Answers
 
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Presented by Doug Burns 15 August 2012 Summary Doug Burns will take a number of questions asked during his recent webinars on OEM and answer them in more detail. This session presents a unique opportunity to build your knowledge on performance analysis using OEM, based on areas the audience requested more information on. In his recent webinars, Doug Burns looked at how the Oracle 10g Diagnostics Pack instrumentation and related OEM Performance Pages offered a new, more visual, performance analysis approach (How I Learned to Love Pictures: OEM Performance Page Fundamentals), and demonstrated the new features in OEM 12c that make OEM more compelling and useful in more situations (Falling in Love All Over Again: OEM 12c Performance Page Enhancements). For our complete archive, and to sign up for upcoming webinars please go to http://www.red-gate.com/oracle-webinars
Views: 18580 Redgate Videos
Introduction to Concurrency Control
 
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The purpose of this unit is to introduce the fundamental technique of concurrency control, which provides database systems the ability to handle many users accessing to data simultaneously. In addition, this unit helps you understand the functionality of database management systems with special reference to on-line transaction processing (OLTP). (Chapter 9)
Views: 21391 vcilt14
Oracle 11g DBA Bangla Tutorial |Ch10_2- Data & Concurrency | Database Management System | Training
 
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See the Description for required source code and links Oracle DBA Tutorial Source Code of Oracle Database Training: https://drive.google.com/open?id=0Bz0MNaVyRm3lZXJoUlhVN0ZJd28 Chapter-10 : Managing Data & Concurrency. In this chapter, you will know about what is data, data transaction, procedure, pl sql function, trigger, commit, rollback, savepoint, pl sql objects, dml, deadlock.The procedure, pl sql function, trigger are important object in oracle. Oracle DBA training including database design is special computer training designed online courses on Database Management System. It is fully bangla tutorial of Oracle 11g database administration. It will be much helpful for every database programmer and administrator. Subscribe this channel to watch my all tutorials on PHP, MYSQL, Javascript, Linux, Networking, Access Programming & Microsoft Office, C++, HTML, CSS. Oracle Database Administration PDF eBook Link : https://drive.google.com/open?id=0Bz0MNaVyRm3la2dYR1A1SlRiVlk All Source Codes & Required Documents together are found in the link: https://drive.google.com/open?id=0Bz0MNaVyRm3ldTUwaTd4cjVka0k Oracle DBA Tutorials: https://www.youtube.com/playlist?list=PLUYY2piVmub6bRM0ScQMNnbyH66yrh1cf Oracle - SQL Tutorial link: https://www.youtube.com/playlist?list=PLUYY2piVmub7QL0ET2_eg4D_SV3AOsPHT Channel Link: http://www.youtube.com/channel/UCT_fWLNX67sDH3W3FZ1wxLg?sub_confirmation=1 Required Document Link : https://drive.google.com/open?id=0Bz0MNaVyRm3lTWNhMURIbFV1MjA FB Page: https://www.facebook.com/BanglaTutorial24 FB Group: https://www.facebook.com/groups/banglatutorial24/ N.B: In the video tutorial, I have tried to describe about pl sql, data transaction, procedure, pl sql function, trigger, data manipulation languages - DML in oracle database. [SQL TUTORIAL, DATABASE MANAGEMENT SYSTEM, BANGLA TUTORIAL, TRAINING, DATABASE, ORACLE DBA]
Views: 189 MD. SHARIFUL ALAM
Oracle DB - Undo Data
 
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Oracle DB - Undo Data Watch More Videos at: https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjabi, Tutorials Point India Private Limited
03 Dead Lock in oracle database
 
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DML Locks DML locks or data locks guarantee the integrity of data being accessed concurrently by multiple users. DML locks help to prevent damage caused by interference from simultaneous conflicting DML or DDL operations. By default, DML statements acquire both table-level locks and row-level locks. The reference for each type of lock or lock mode is the abbreviation used in the Locks Monitor from Oracle Enterprise Manager (OEM). For example, OEM might display TM for any table lock within Oracle rather than show an indicator for the mode of table lock (RS or SRX). Row Locks (TX) Row-level locks serve a primary function to prevent multiple transactions from modifying the same row. Whenever a transaction needs to modify a row, a row lock is acquired by Oracle. There is no hard limit on the exact number of row locks held by a statement or transaction. Also, unlike other database platforms, Oracle will never escalate a lock from the row level to a coarser granular level. This row locking ability provides the DBA with the finest granular level of locking possible and, as such, provides the best possible data concurrency and performance for transactions. The mixing of multiple concurrency levels of control and row level locking means that users face contention for data only whenever the same rows are accessed at the same time. Furthermore, readers of data will never have to wait for writers of the same data rows. Writers of data are not required to wait for readers of these same data rows except in the case of when a SELECT... FOR UPDATE is used. Writers will only wait on other writers if they try to update the same rows at the same point in time. In a few special cases, readers of data may need to wait for writers of the same data. For example, concerning certain unique issues with pending transactions in distributed database environments with Oracle. Transactions will acquire exclusive row locks for individual rows that are using modified INSERT, UPDATE, and DELETE statements and also for the SELECT with the FOR UPDATE clause. Modified rows are always locked in exclusive mode with Oracle so that other transactions do not modify the row until the transaction which holds the lock issues a commit or is rolled back. In the event that the Oracle database transaction does fail to complete successfully due to an instance failure, then Oracle database block level recovery will make a row available before the entire transaction is recovered. The Oracle database provides the mechanism by which row locks acquire automatically for the DML statements mentioned above. Whenever a transaction obtains row locks for a row, it also acquires a table lock for the corresponding table. Table locks prevent conflicts with DDL operations that would cause an override of data changes in the current transaction. Table Locks (TM) What are table locks in Oracle? Table locks perform concurrency control for simultaneous DDL operations so that a table is not dropped in the middle of a DML operation, for example. When Oracle issues a DDL or DML statement on a table, a table lock is then acquired. As a rule, table locks do not affect concurrency of DML operations. Locks can be acquired at both the table and sub-partition level with partitioned tables in Oracle. A transaction acquires a table lock when a table is modified in the following DML statements: INSERT, UPDATE, DELETE, SELECT with the FOR UPDATE clause, and LOCK TABLE. These DML operations require table locks for two purposes: to reserve DML access to the table on behalf of a transaction and to prevent DDL operations that would conflict with the transaction. Any table lock prevents the acquisition of an exclusive DDL lock on the same table, and thereby prevents DDL operations that require such locks. For example, a table cannot be altered or dropped if an uncommitted transaction holds a table lock for it. A table lock can be held in any of several modes: row share (RS), row exclusive (RX), share (S), share row exclusive (SRX), and exclusive (X). The restrictiveness of a table lock's mode determines the modes in which other table locks on the same table can be obtained and held.
Views: 225 OnLinE ReSoUrCe
Oracle 12c_Lesson 9: Managing Undo Data
 
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Oracle Database 12c Administration Workshop
Views: 120 B N H
Oracle Database 11g Replay Workload
 
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You can use Database Replay to capture a workload on the production system and replay it on a test system with the exact timing, concurrency, and transaction characteristics of the original workload. This enables you to test the effects of a system change without affecting the production system. Database Replay supports workload capture on a system running Oracle Database 10g Release 2 and newer releases. In order to capture a workload on a system running Oracle Database 10g Release 2, the database version can be 10.2.0.4 or higher. Workload replay is only supported on systems running Oracle Database 11g Release 1 and newer releases.
Views: 4415 CLEO & CUQUIN
049-Oracle SQL 12c: Read Consistency
 
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تعلم اوراكل حتى الاحتراف تعلم اوراكل من الصفر
Views: 1589 khaled alkhudari
Oracle database locking issue
 
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Analyzing locks with d.side - Automatic diagnostic for Oracle databases performance and troubleshooting http://www.dside-software.com Copyright (c) d.side software
Views: 252 D.SIDE SOFTWARE
Oracle GoldenGate - Tuning & Troubleshooting (Security, Trails, Networking)
 
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Oracle GoldenGate - Tuning & Troubleshooting (Security, Trails, Networking) Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Dilip Padmanabhan, Tutorials Point India Private Limited.
Demo Session on Oracle By Suman
 
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• INTRODUCTION to ORACLE • Exploring the Oracle Database Architecture • Installing your Oracle Software • Creating an Oracle Database • Managing the Database Instance • Managing Database Storage Structures • Administering User Security • Managing Data Concurrency • Managing Undo Data • Configuring the Oracle Network Environment • Backup and Recovery Concepts • Use of RMAN Recovery Catalog & Configuring Backup Settings • Performing Database Backups with RMAN • Performing Database Recovery • Moving Data ( Expdp, Impdp, Sqlloader & External tables ) • Using Flashback Technology I • Using Flashback Technology II • Implementing Oracle Database Auditing • Database Maintenance ( ADR, AWR, ADDM... ) • Performance Management ( Memory, Instance ... ) • Managing Performance by SQL Tuning • Diagnosing the Database • Managing Space • Managing Space for the Database • Configuring & Managing ASM Instance • Duplicating a Database / Cloning Database • Data Guard Concepts & Administration • Database Patches & Database Upgrades • Introduction to Real Application Clusters ( RAC )
Views: 156 Linga Infotech
Tutorial 52 - Transactions in PostgreSQL.
 
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Learn about Transactions in PostgreSQL
Views: 3497 Programming Guru
Practice 8 Managing Data and Concurrency surya
 
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Practice 8 Managing Data and Concurrency surya wahyusantoso 2103157024
Views: 3 Surya Right
Oracle Database 11g Managing Undo
 
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Oracle 11g Undo Management
Views: 1381 Hari Shankar
Foglight for Oracle Advanced - A Day in the Life of an Oracle DBA
 
19:27
This 19 minute video will pick up where "Foglight for Oracle Advanced - A Brief Primer" left off. We will go into the software itself to give you a "Day in the Life" of an Oracle database administrator. This presentation is more of a tutorial on best practices of using the software. Kris Hutchinson presents.
Views: 1607 khutchinsonquest
Hints and Tips - Avoiding never ending locks - part 1
 
05:52
Row locking is a critical component of ensuring the integrity of your data inside the database. But locks of extended duration can easily create system-wide problems in your applications. This quick tip gives you some ideas for handling locks better. ====================================================== 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: 1063 Connor McDonald

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