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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: 10456 Oracle World
01 Oracle database Table lock
 
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Purpose Use the LOCK TABLE statement to lock one or more tables, table partitions, or table subpartitions in a specified mode. This lock manually overrides automatic locking and permits or denies access to a table or view by other users for the duration of your operation. Some forms of locks can be placed on the same table at the same time. Other locks allow only one lock for a table. A locked table remains locked until you either commit your transaction or roll it back, either entirely or to a savepoint before you locked the table. A lock never prevents other users from querying the table. A query never places a lock on a table. Readers never block writers and writers never block readers. See Also: Oracle Database Concepts for a complete description of the interaction of lock modes COMMIT ROLLBACK SAVEPOINT Prerequisites The table or view must be in your own schema or you must have the LOCK ANY TABLE system privilege, or you must have any object privilege on the table or view. ROW SHARE ROW SHARE permits concurrent access to the locked table but prohibits users from locking the entire table for exclusive access. ROW SHARE is synonymous with SHARE UPDATE, which is included for compatibility with earlier versions of Oracle Database. ROW EXCLUSIVE ROW EXCLUSIVE is the same as ROW SHARE, but it also prohibits locking in SHARE mode. ROW EXCLUSIVE locks are automatically obtained when updating, inserting, or deleting. SHARE UPDATE See ROW SHARE. SHARE SHARE permits concurrent queries but prohibits updates to the locked table. SHARE ROW EXCLUSIVE SHARE ROW EXCLUSIVE is used to look at a whole table and to allow others to look at rows in the table but to prohibit others from locking the table in SHARE mode or from updating rows. EXCLUSIVE EXCLUSIVE permits queries on the locked table but prohibits any other activity on it. NOWAIT Specify NOWAIT if you want the database to return control to you immediately if the specified table, partition, or table subpartition is already locked by another user. In this case, the database returns a message indicating that the table, partition, or subpartition is already locked by another user. WAIT Use the WAIT clause to indicate that the LOCK TABLE statement should wait up to the specified number of seconds to acquire a DML lock. There is no limit on the value of integer. If you specify neither NOWAIT nor WAIT, then the database waits indefinitely until the table is available, locks it, and returns control to you. When the database is executing DDL statements concurrently with DML statements, a timeout or deadlock can sometimes result. The database detects such timeouts and deadlocks and returns an error.
Views: 844 Md Arshad
Oracle - Locking - Beginner
 
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Oracle - Locking - Beginner
Views: 8510 Chris Ostrowski
Oracle Database Lock Mode
 
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Tipe – tipe lock yang terdapat di oracle database
Views: 204 Muhammad Umar
Oracle Tutorial || Oracle|Adv Sql |online training|| Table Locks 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 Locks Explained Part 1
 
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Oracle Locks explained. How to Kill a User session in oracle database- Neway IT Solutions
Views: 2194 NewayITSolutions LLC
DBMS - Locking Methods
 
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DBMS - Locking Methods Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited
How to corrupt a block and how to recover it
 
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In this session i'm going to discus with you How to corrupt a block and how to recover it step by step
Views: 3198 OCP Technology
Oracle Midlands #13: All About Table Locks - Franck Pachot
 
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Timestamps: 0:45 - Basics 5:03 - TX lock demo 9:30 - TM lock info 21:04 - Foreign key index demo 28:48 - 10g, 11g, 12c locking differences 41:50 - New online operations in 12c 46:26 - Event 10704 trace 50:34 - Deadlock demo 53:42 - Q&A Franck discusses different types of locking scenarios to consider with your systems. The slides are available at: Google: https://drive.google.com/folderview?id=0B0DLaAfeW6uKZmJ3TXE0WGtLYlE Dropbox: https://www.dropbox.com/sh/9koxoemak8ts7j6/AADozVVYLoK_FdDZbQGC6TYta This event was sponsored by Red Stack Technology (http://redstacktechnology.com/). See more events at http://OracleMidlands.com/ Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for fair use for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use. "Fair Dealing" under UK Copyright, Designs and Patents Act 1988.
Views: 816 Oracle Midlands
02 Shared Lock & Exclusive Lock In oracle database table lock
 
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Purpose Use the LOCK TABLE statement to lock one or more tables, table partitions, or table subpartitions in a specified mode. This lock manually overrides automatic locking and permits or denies access to a table or view by other users for the duration of your operation. Some forms of locks can be placed on the same table at the same time. Other locks allow only one lock for a table. A locked table remains locked until you either commit your transaction or roll it back, either entirely or to a savepoint before you locked the table. A lock never prevents other users from querying the table. A query never places a lock on a table. Readers never block writers and writers never block readers. See Also: Oracle Database Concepts for a complete description of the interaction of lock modes COMMIT ROLLBACK SAVEPOINT Prerequisites The table or view must be in your own schema or you must have the LOCK ANY TABLE system privilege, or you must have any object privilege on the table or view. ROW SHARE ROW SHARE permits concurrent access to the locked table but prohibits users from locking the entire table for exclusive access. ROW SHARE is synonymous with SHARE UPDATE, which is included for compatibility with earlier versions of Oracle Database. ROW EXCLUSIVE ROW EXCLUSIVE is the same as ROW SHARE, but it also prohibits locking in SHARE mode. ROW EXCLUSIVE locks are automatically obtained when updating, inserting, or deleting. SHARE UPDATE See ROW SHARE. SHARE SHARE permits concurrent queries but prohibits updates to the locked table. SHARE ROW EXCLUSIVE SHARE ROW EXCLUSIVE is used to look at a whole table and to allow others to look at rows in the table but to prohibit others from locking the table in SHARE mode or from updating rows. EXCLUSIVE EXCLUSIVE permits queries on the locked table but prohibits any other activity on it. NOWAIT Specify NOWAIT if you want the database to return control to you immediately if the specified table, partition, or table subpartition is already locked by another user. In this case, the database returns a message indicating that the table, partition, or subpartition is already locked by another user. WAIT Use the WAIT clause to indicate that the LOCK TABLE statement should wait up to the specified number of seconds to acquire a DML lock. There is no limit on the value of integer. If you specify neither NOWAIT nor WAIT, then the database waits indefinitely until the table is available, locks it, and returns control to you. When the database is executing DDL statements concurrently with DML statements, a timeout or deadlock can sometimes result. The database detects such timeouts and deadlocks and returns an error.
Views: 924 Md Arshad
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: 262 Md Arshad
Can you flashback table into SYSTEM tablespace?
 
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Flashback feature in Oracle database is well known to roll back the table to a specific timestamp (depends on undo retention) or to restore dropped table and many more. We must have used this flashback feature so far on application schema objects and found working without any issues. As an Oracle DBA did you configure any tools (might be monitoring, RMAN catalog or any) with objects created in SYSTEM tablespace? If so, you probably would see some problems later when you need to use Flashback on these objects though they are not Oracle supplied objects. Let us go through a case study which will clearly explain you the functionality of Flashback table. Did you like the video? Subscribe now, Like it and share it. Looking for Oracle DBA training or services? redirect to www.orskl.com WhatsApp to +919951696808
Views: 1611 OrSkl Academy
SCPT 48: Oracle Storage Parameters: INITTRANS and MAXTRANS
 
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Oracle DBA Tutorials 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: 13348 Oresoft LWC
SCPT 38: What is Blocking in Oracle
 
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Oracle DBA Tutorials 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: 15937 Oresoft LWC
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.
3.ORACLE WORLD - Flashback Table Point in time Recovery in oracle
 
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Hello friends in this demo we learn about how to perform a flashback point in time recovery on table in Oracle database,one important thing is that flashback not supported on SYS user objects... #performingflashback #FlashbackTablePointintimeRecovery By Lalit Saini
Views: 3448 Oracle World
Concurrency Control - Lock Based Protocol in DBMS Transaction Management
 
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DBMS Tutorial in English, Hindi - Concurrency Control - Lock Based Protocol in DBMS Transaction Management for students of IP University Delhi and Other Universities, Engineering, MCA, BCA, B.Sc, M.Sc Colleges.
Views: 209614 Easy Engineering Classes
Secure Logical Standby Oracle database
 
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Understand how do you secure your logical standby oracle database
Views: 1112 OrSkl Academy
Table Locking ( MySQL ) - Tutorial
 
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Table locking is an existing query in mysql, where this query is used to lock the table at the time the user or admin wants to perform INSERT, UPDATE, or DELETE. This query is run when a database resides on the server and there are few users who can access the database.So in order to avoid conflicting data during INSERT, UPDATE, DELETE then use Table Locking. - Introduction : 0:00 - Coding : 0:52
Views: 7218 Muhammad Ikram
SCPT 37: Optimistic and Pessimistic Locking
 
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Oracle DBA Tutorials 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: 22918 Oresoft LWC
How to Release a lock on Table in SQL Server
 
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Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg By the Way to Terminate a Session is used to Release a Lock in a Table. In this Video we used KILL Statement to Release a Lock. KILL can be used to terminate a normal connection, which internally terminates the transactions that are associated with the specified session ID. So, Transaction automatically gets Rolled back and Lock will be Released.
Views: 1119 IT Port
Oracle Locks and Lock Trees
 
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Rows Locks and sessions waiting in a "tree order" on Row Locks in Oracle
Views: 229 Hemant K Chitale
How to identify and resolve database locks in Spotlight on Oracle
 
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This video shows how to identify and resolve database locks in Spotlight on Oracle. https://www.quest.com/Spotlight-on-Oracle
Views: 5204 Dell EMC Support
Lock and Unlock table statistics in Oracle Database
 
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Lock and Unlock table statistics in Oracle Database
How to Easily Identifying Oracle Locks
 
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How to Easily Identifying Oracle Locks. For more information, please go to: http://www.embarcadero.com/products/dbartisan-xe
Views: 2081 DBPowerStudio
Database Transactions, part 4: Autocommit Mode
 
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Autocommit modes treats every SQL command as though it was wrapped in a tiny transaction. Learn how to disable autocommit mode and the implications of doing so.
Views: 11301 Barry Brown
7.ORACLE WORLD- FLASHBACK TRANSACTION QUERY
 
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Hi guys today we will learn how to perform flashback transaction query to find out the DDL that performed by users. #FLASHBACKTRANSACTIONQUERY Oracle database Unbeatable,Unbreakable Platform..
Views: 1564 Oracle World
Oracle DBA Justin - How to put an Oracle database in restricted session mode
 
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How to put an Oracle database in restricted session mode
Views: 2568 jbleistein11
SCPT 46:Oracle Storage Termininology:  High Water Mark and Free Lists
 
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Oracle DBA Tutorials 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: 18392 Oresoft LWC
Oracle User account is Locked/Expired & Backup of user account password
 
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This video will cover the trobleshooting steps for follwoing three topics 1) User account in Locked 2) User account is Locked and expired 3) Backup of user account/Reset password Please visit my official website for oracle database training and hadoop blog. https://www.orcldata.com/ Please donate on below link if you think I am helping you with your career. https://www.paypal.me/ankushthavali OR Google Pay : 9960262955 OR Account No : 31347845762 IFSC: SBIN0012311 how to change expiry date of user in oracle alter user account lock oracle alter user password never expire alter user password expire how to change expired password in oracle sql developer how to unlock oracle user account in 11g oracle system password expired oracle expired(grace)
Views: 521 ANKUSH THAVALI
TSQL: Bulk Insert Data
 
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Easy script for bulk inserting data using TSQL
Views: 11390 SQLInSix Minutes
Oracle DBA Tutorials || online training || Database links by Shiva
 
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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 sql materialized view refresh complete
 
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Oracle sql materialized view refresh complete
Views: 7399 Sridhar Raghavan
SCPT 25: Hardware Consideration For Installing Oracle Database
 
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Hardware requirement for Oracle Database 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: 11330 Oresoft LWC
Turn FLASHBACK DATABASE on & off while the Database stays OPEN
 
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The clip demonstrates how to change FLASHBACK DATABASE without having to restart the instance. A text version is here: https://uhesse.com/2010/06/25/turning-flashback-database-on-off-with-instance-in-status-open/ The demo is done with 12c but the shown can be done with 11gR2 as well.
How to use the auto commit feature in oracle database
 
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How to use the auto commit feature in oracle database ===================================================== show autocommit; set autocommit on; create table fruit(sno number); insert into fruit values(1); insert inot fruit values(2); how to rollback the uncommited transactions ========================================= rollback;
Views: 880 Praveen Biyyapu
Foglight for Oracle Overview
 
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https://www.quest.com/products/foglight-for-oracle/ [0:00 - 1:40] Introduction [1:41 - 3:05] Global View and Baseline [3:06 - 3:28] Monitoring Coverage [3:29 - 4:21] Homepage [4:22 - 4:57] Alert Log [4:58 - 5:23] Tablespaces [5:24 - 6:09] ASM [6:10 - 6:54] Pluggable Databases (aka Multitenant) [6:55 - 7:47] FRA (Fast Recovery Area) [7:48 - 8:26] Data Guard [8:27 - 9:41] SQL PI Introduction [9:42 - 10:31] Multi-Dimensional Workload Analysis [10:32 - 11:08] Workload Activity Highlights [11:09 - 12:01] Lock Analysis [12:02 - 12:38] I/O Analysis [12:39 - 13:29] Change Tracking [13:30 - 14:31] Execution Plan Analysis [14:32 - 15:14] Compare [15:15 - 15:46] Advisories [15:47 - 17:52] Reporting [17:53 - 18:05] Deployment
Views: 280 Quest
Oracle DB - Dedicated & Shared Server Process
 
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Oracle DB - Dedicated & Shared Server Process Watch More Videos at: https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjabi, Tutorials Point India Private Limited
SCPT 12: Oracle System Global Area
 
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Oracle DBA Tutorials 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: 31509 Oresoft LWC
Open Database Recovery when Initially Oracle Database was Closed on Window
 
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By Vivek Saxena Insa Shabad Coachings Shamli Open Database Recovery(Recover database at run time) in Archive Mode when Database Initially Closed Create tabkespace vivek2 datafile 'e:\vivek2a.dbf' size 200k; Create table vivek(rn number(20)) tabkespace vivek2; Insert into vivek values(1); Commit ; Alter system switch logfile ; Shut immediate Startup Database mounted ERROR:ORA-01157:can't identified/lock data file 5 - see DBWR trace file ORA-01110: data file 5 Alter database datafile 5 offline ; Alter database open ; Alter database rename file 'e:\vivek2a.dbf' to 'c:\db3\data\vivek2a.dbf'; Set autorecovery on Select * from dba_data_files; Desc v$datafile ; Select file#, status from v$datafile ; Select * from v$recover_file ; Recover datafile 5; Alter database datafile 'c:\db3\data\vivek2a.dbf online ; select * from vivek ;
What is Oracle.wmv
 
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This video describe Oracle Technology Stack For Full Course Experience Please Go To http://mentorsnet.org/course_preview?course_id=4 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: 14097 Oresoft LWC
Oracle DBA Tutorial || Online Training || Flashback techonogies by Shiva
 
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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......
SqlServer transaction locking vs postgreSQL
 
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Video demonstrating the transaction interference in Sqlserver due to its locking mechanis vs the expected behavior on postgreSQL A table is created in both databases, first sqlserver is used and two clients are used to simulate diferent conections. While sqlserver locks on insert, remove, or update. Postgres does as expected and allows you to complete other transactions
Views: 272 Dario Garcia
Lock Modes - Locks in SQL Server - Part 2
 
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Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg The Microsoft SQL Server Database Engine locks resources using different lock modes that determine how the resources can be accessed by concurrent transactions. There are more than 20 types of Lock modes in SQL Server. Here we list out Most Important lock modes.
Views: 513 IT Port
Lock Compatibility in SQL Server Tamil
 
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Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg Lock compatibility controls whether multiple transactions can acquire locks on the same resource at the same time. If a resource is already locked by another transaction, a new lock request can be granted only if the mode of the requested lock is compatible with the mode of the existing lock. If the mode of the requested lock is not compatible with the existing lock, the transaction requesting the new lock waits for the existing lock to be released or for the lock timeout interval to expire.For example, no lock modes are compatible with exclusive locks. While an exclusive (X) lock is held, no other transaction can acquire a lock of any kind (shared, update, or exclusive) on that resource until the exclusive (X) lock is released. Alternatively, if a shared (S) lock has been applied to a resource, other transactions can also acquire a shared lock or an update (U) lock on that item even if the first transaction has not completed. However, other transactions cannot acquire an exclusive lock until the shared lock has been released. Explained in Tamil
Views: 161 IT Port
Oracle Performance Tuning - Loading Data - 05 Direct Path Load
 
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Connect with me or follow me at https://www.linkedin.com/in/durga0gadiraju https://www.facebook.com/itversity https://github.com/dgadiraju https://www.youtube.com/c/TechnologyMentor https://twitter.com/itversity
Views: 1746 itversity
Oracle Deadlock
 
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Views: 208 Ladida455
Créer un compte admin bd Oracle
 
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Create an Admin Account Oracle database, creer utilisateur base de données oracle
Views: 292 Global Tech
Using Savepoint, Commit and Rollback in SQL,  Class 12 IP
 
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This video explains what are transactions, How transactions work, their properties and how to solve output questions using Commit, Rollback and Savepoints. Also explain the purpose of Autocommit.
Views: 9921 Anjali Luthra

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