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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: 884 Md Arshad
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: 959 Md Arshad
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: 7522 Oracle World
MySQL Deadlock Situation
 
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In the eighth episode of the 'Getting Started with MySQL' series, we saw some demonstrations on the Transaction capabilities of InnoDB Storage Engine in MySQL. We also understood the role of 'tx_isolation' variable in MySQL Transaction. Now in this short episode, we'll see how MySQL overcomes a Deadlock situation. When two Transactions wait for each other's lock, that ends up being a never ending wait. Such a situation (Deadlock) is handled automatically by MySQL, aborting one of those Transactions. One of the reasons why it is recommended to keep Transactions short (with only a few set of statements) is avoid situations when a Deadlock occurs and a lengthy Transaction gets aborted.
Views: 1844 Rajesh Rajasekharan
How To Kill All Database Processes On SQL Server
 
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SQl management studio provides lot of facilities to manage SQL processes. The “Activity monitor screen” which will show you some very useful and important information about SQL processes. It will show you all active processes, there status, number of open transactions for each process, the application by which the process is generated, Wait time CPU and memory utilisation, and the host name, means the host or the machine by which the process is initiated etc. If a process is hanging, it will show the process icon with an hour glass. Refresh it several times, sometimes the icon will turn to sleep mode if the process completes its execution. If the icon remains an hour glass, the process may be hanging. Use other info as well to decide if the process is really hanging. If you double click on the process ID it will show the SQL stamen subjected to the execution of the process. If a process is hanging you can identify which application has originated the process, which SQL stamen is hanging and even more from which machine or the host the process is initiated If some application users are complaining about uneven slowness, uneven timeouts etcetera, the reason behind may be one or more processors are hanging. What can you do now? You can restart the SQL server or the service which will disconnect all databases and all applications disturbing all the users. Or otherwise you can take the database to off line and bring it back to online. Or you can disconnect all connections to the database. The disturbance may be lesser than the previous case but still lot of applications and users can be disturbed, especially in an industrial setup. And still you do not know the real reason for the slowness or the malfunctioning as well. So what can you do? Go and examine the processors. Identify exactly which process is hanging. And most probably you will be identifying how and why. So you can find permanent solution. But the immediate solution is you can kill the troubling process or the few. It will solve the issue with minimum disturbance immediately. After identifying the correct process, you can right click on the process ID and click on ‘Kill process’ button. It will kill the selected process. You can kill processors using SQL statements and, using SQL commands you can kill all processors at once as well. Code for Killing Processes Individually USE master go DECLARE @dbname sysname SET @dbname = 'YourDB' EXECUTE ('KILL 53') Code for killing all Processes USE master go DECLARE @dbname sysname SET @dbname = 'YourDB' DECLARE @spid int SELECT @spid = min(spid) from master.dbo.sysprocesses where dbid = db_id(@dbname) WHILE @spid IS NOT NULL BEGIN EXECUTE ('KILL ' + @spid) SELECT @spid = min(spid) from master.dbo.sysprocesses where dbid = db_id(@dbname) AND spid @spid END
Views: 7286 Rohan Mehtha
How to fix deadlocks with SQLGrease
 
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See how SQLGrease helps identify and provide all the details necessary to fix a SQL Server deadlock. Visit us at www.sqlgrease.com for a free 7 day trial. No credit card required.
Views: 762 SQLGrease
DB2 Tips n Tricks Part 20 - How to Avoid Transaction Rollback after Lock Timeout
 
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How to Avoid Transaction Rollback after Lock Timeout db2set DB2LOCK_TO_RB = STATEMENT Happy Learning & Sharing
Views: 2362 DB2-LUW-ACADEMY
دروس برمجة: حساب التاريخ و الوقت الحالي بصيغة unix timestamp لـ (java,php,javascript,oracle,mysql)
 
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السلام عليكم و رحمة الله و بركاته درس اليوم يشرح عن طريقة حساب التاريخ و الوقت الحالي بصيغة unix timestamp لــ: java php javascript oracle mysql رابط صفحة الفيسبوك: https://www.facebook.com/HusseinAbusettaPage/ اشتركوا بالقناة ليصلكم كل جديد من مواضيع و فيديوهات شكراً لكم.
Views: 69 HUSSEIN ABU SETTA
(Ep. 14) - DB2 Database Locking Concepts
 
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The dreaded SQL0911N! The application failed because of a deadlock! It must be the database! (Hint: No, it's not). In this episode, we are going to discuss the basics of locking within Db2. What happens with a lock, what types of locking can happen, and does it mean something is wrong with my database? Timestamps: 00:10 - Describe locking issues through analogy. 01:00 - Normal locking behavior in a database (by example) 01:28 - Lock Wait (by example) 02:15 - Lock Timeout (by example) 03:19 - Deadlock (by example) 05:18 - Is the database the cause of locking problems? Useful Links: (Blog) Locks - Timeout vs. Deadlock - https://tinyurl.com/82tsqtz (Blog) DB2 Locking, Part 1: An Overview - https://tinyurl.com/y8rqwmmq (KC) Locks and Concurrency Control - https://tinyurl.com/ydybyvff (Reddit) Simulating a Lock Timeout and Deadlock Scenario - https://redd.it/67o6y0
Views: 485 DISCOVER.DB2
14-SQL NOLOCK
 
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تنفيذ الاستعلام وعدم انتظار الوظائف حتى الانتهاء منها (NOLOCK) رابط قاعدة البيانات المستخدمه : http://bit.ly/2epwzIe جروب الفيس بوك http://bit.ly/2eBlpzn صفحة فيس بوك http://bit.ly/2egqEBx
Views: 464 Ahmed Baidak
#15 October 2011: Fully logged operations
 
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SQLskills Insider video from October 3rd, 2011 newsletter. Several times over the last few weeks I've seen people being confused about the number of log records that will be generated by fully-logged bulk operations so I thought I'd do a quick demo to show you how things work and that expected behavior is not always what you get. The video is about 10 minutes long. Demo code: http://www.SQLskills.com/InsiderContent/YouTube/Insider201110Code.zip You can get all the Insider videos by joining our community, with a bi-weekly newsletter with an editorial, demo video, and book review. http://www.SQLskills.com/Insider.
Views: 421 Paul Randal
#1 March 2011: RESTART option for RESTORE commands
 
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SQLskills Insider video from March 9th, 2011 newsletter. A little know feature of RESTORE is that you can "resume" where you left off if there's a failure. For example, imagine that you're an hour into restoring a 2TB database when the power fails. Instead of completely restarting the restore you can execute the SAME restore command with the RESTART option. Don't get me wrong, I think this is horribly named as what you're doing with the RESTART option is effectively a RESUME not a RESTART. But it's an awesome feature! Demo code: http://www.SQLskills.com/InsiderContent/YouTube/Insider201103Code.zip You can get all the Insider videos by joining our community, with a bi-weekly newsletter with an editorial, demo video, and book review. http://www.SQLskills.com/Insider.
Views: 880 Paul Randal
#6 May 2011: Checkpoint tracking
 
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SQLskills Insider video from May 15th, 2011 newsletter. Several times recently I've been asked about checkpoints and how to track the I/O load they place on SQL Server. There are two trace flags you can use to trace checkpoint information so you can tell which database is the one undergoing a checkpoint when an I/O spike occurs. To show you this I thought I'd do a demo for you. The short video (11 minutes) shows how to track checkpoints using perfmon, the trace flags, and looking in the log to examine the checkpoint log records themselves. Demo code: http://www.SQLskills.com/InsiderContent/YouTube/Insider201105Code-2.zip You can get all the Insider videos by joining our community, with a bi-weekly newsletter with an editorial, demo video, and book review. http://www.SQLskills.com/Insider.
Views: 4331 Paul Randal
Resourse Busy demo.mp4
 
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Demo on 11g parameter ddl_lock_timeout parameter
Find query timeouts in Profiler
 
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I like this video. This is a simple example of how you can track down queries that are timing out. Be careful though. If your trace table is too large it can take a long time to pull back the results. You can also add other elements to this to increase the accuracy. Perhaps I'll put together a sequel sometime.
Views: 650 MidnightDBA
Дмитрий Ленев — Блокировки в MySQL: история и архитектура
 
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Дмитрий Ленев, Oracle, MySQL Server Team — Блокировки в MySQL: история и архитектура Встреча CodeFreeze в Москве 19.02.2015 Отдельное внимание было уделено тому, какие исторические предпосылки и причины привели к возникновению трех отдельных подсистем и выбору различных подходов для решения, казалось бы, сходных задач. Были рассмотрены различные подходы к борьбе с дедлоками (deadlock avoidance vs deadlock detection). Речь шла и об использовании lock-free техник в реализации менеджера блокировок.
Views: 2658 СodeFreezeVideo
Avoiding Deadlocks
 
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I give some advice on how to avoid deadlocks.
Views: 3116 JimOnDemand
#nowait update 1
 
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#NOWAIT Release Date!! Sept. 6th 2011
Views: 510 TheGradTV
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: 7435 Muhammad Ikram
ORA 00054  resource busy and acquire with NOWAIT specified
 
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ORA 00054 resource busy and acquire with NOWAIT specified Find More details Here: http://oracletech2u.blogspot.com/2014/03/ora-00054-resource-busy-and-acquire.html
Views: 1237 oratech ahmed
SQL Tip #7: How to debug your SQL
 
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Several tips on how to debug a SQL select statement in Microsoft SQL Server Management Studio
Views: 6468 ITCorpsTV
db2diag visualization
 
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experimental visualization of db2diag log. play-by-play using google motion chart...
Views: 616 db2udbadm
sql lock
 
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Views: 73 man-han Tsai
Myth about Remote Query Timeout option in SQL Server
 
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This video is to clarify how Remote Query Timeout option works. This includes the demo showing in what situation this particular option come into picture.
Views: 1300 SQLGeeksPro
DB2 - Concurrency Control
 
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DB2 - Concurrency Control Watch More Videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Nishant Malik, Tutorials Point India Private Limited.
db2top: The Locks screen
 
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Demonstration of the Locks screen of db2top. Includes creating a lock chain, examining Application Status, Object Name, Locked By and Lock Count and using the Lock Chain screen (from http://www.thekguy.com).
Views: 5451 The K Guy
#2 March 2011: Logging during SELECT-INTO operations
 
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SQLskills Insider video from March 22nd, 2011 newsletter. There has been some discussion on the #sqlhelp Twitter hash-tag recently about the amount of transaction log that is generated for some operations in the different recovery models. I thought I'd dive in a bit deeper for you and investigate the difference between the BULK_LOGGED and FULL recovery models for a SELECT-INTO statement so I put together a demo and recorded a short (10 minutes) video for you. Demo code: http://www.SQLskills.com/InsiderContent/YouTube/Insider201103Code2.zip You can get all the Insider videos by joining our community, with a bi-weekly newsletter with an editorial, demo video, and book review. http://www.SQLskills.com/Insider.
Views: 553 Paul Randal
Always Be Running: Long-Running and Fault-Tolerant Java Services
 
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Michael Duigou, Instigator, Definitely Not A Robot For high-availability services, rebooting or starting a new instance is not a viable failure-handling strategy. This session covers experiences and approaches used for developing and deploying resilient, fault-tolerant code. It looks at exception handling, threads and pools, locking, timeouts, deadlocks, recovery, memory, logging, saturation/runaways, resource hogs, manual repair of running systems, and—yes—when a reboot is your best option. The presenter works on the on-vehicle software for the Liquid Robotics Wave Glider, an autonomous marine data collection platform that often spends months at a time at sea.
Views: 715 Oracle Developers
Core Java With OCJP/SCJP: Multithreading Enhancement  Part- 3|| java.util.concurrent.locks
 
01:36:50
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Creating and Identifying Deadlocks in SQL Server
 
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The following video shows you how to create a deadlock and how you can proactively monitor deadlocks using the default system health extended event.
Views: 2021 Procure SQL LLC
Oracle DB 12c - Automatic Data Optimization
 
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Oracle DB 12c - Automatic Data Optimization Watch more videos at https://www.tutorialspoint.com/videotutorials/index.htm Lecture By: Mr. Parth Panjabi, Tutorials Point India Private Limited
SQL timeout expired. The timeout period elapsed prior to completion of the operation
 
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Description https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout.aspx c # Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. Have you set the CommandTimeout ? . If not set the CommmandTimeout (in seconds) check. Most of the times it should work. The below URL gives you more information about CommandTimeout. https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout.aspx This property is the cumulative time-out (for all network packets that are read during the invocation of a method) for all network reads during command execution or processing of the results. A time-out can still occur after the first row is returned, and does not include user processing time, only network read time. For example, with a 30 second time out, if Read requires two network packets, then it has 30 seconds to read both network packets. If you call Read again, it will have another 30 seconds to read any data that it requires.
Views: 8214 Rohan Mehtha
MySQL Chapter 17 - Locks
 
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Views: 2722 Suresh Kumar
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: 170 IT Port
WAITFOR DELAY | TIME in SQL Server
 
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Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg Blocks the execution of a batch, stored procedure, or transaction until a specified time or time interval is reached, or a specified statement modifies or returns at least one row. While executing the WAITFOR statement, the transaction is running and no other requests can run under the same transaction. The actual time delay may vary from the time specified in time_to_pass, time_to_execute, or timeout and depends on the activity level of the server. The time counter starts when the thread associated with the WAITFOR statement is scheduled. If the server is busy, the thread may not be immediately scheduled; therefore, the time delay may be longer than the specified time.
Views: 415 IT Port
Update - Locks in SQL Server - Part 4
 
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Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg Update (U) locks prevent a common form of deadlock. In a repeatable read or serializable transaction, the transaction reads data, acquiring a shared (S) lock on the resource (page or row), and then modifies the data, which requires lock conversion to an exclusive (X) lock. If two transactions acquire shared-mode locks on a resource and then attempt to update data concurrently, one transaction attempts the lock conversion to an exclusive (X) lock. The shared-mode-to-exclusive lock conversion must wait because the exclusive lock for one transaction is not compatible with the shared-mode lock of the other transaction; a lock wait occurs. The second transaction attempts to acquire an exclusive (X) lock for its update. Because both transactions are converting to exclusive (X) locks, and they are each waiting for the other transaction to release its shared-mode lock, a deadlock occurs. To avoid this potential deadlock problem, update (U) locks are used. Only one transaction can obtain an update (U) lock to a resource at a time. If a transaction modifies a resource, the update (U) lock is converted to an exclusive (X) lock. Isolation Level - https://youtu.be/ESET4zuNLoM Script for Active_Locks Function --------------------------------------------------- Create Function Active_locks () returns table return select Top 10000000 case dtl.request_session_id when -2 then 'orphaned distributed transaction' when -3 then 'deferred recovery transaction' else dtl.request_session_id end as spid, db_name(dtl.resource_database_id) as databasename, so.name as lockedobjectname, dtl.resource_type as lockedresource, dtl.request_mode as locktype, es.login_name as loginname, es.host_name as hostname, case tst.is_user_transaction when 0 then 'system transaction' when 1 then 'user transaction' end as user_or_system_transaction, at.name as transactionname, dtl.request_status from sys.dm_tran_locks dtl join sys.partitions sp on sp.hobt_id = dtl.resource_associated_entity_id join sys.objects so on so.object_id = sp.object_id join sys.dm_exec_sessions es on es.session_id = dtl.request_session_id join sys.dm_tran_session_transactions tst on es.session_id = tst.session_id join sys.dm_tran_active_transactions at on tst.transaction_id = at.transaction_id join sys.dm_exec_connections ec on ec.session_id = es.session_id cross apply sys.dm_exec_sql_text(ec.most_recent_sql_handle) as st where resource_database_id = db_id() order by dtl.request_session_id
Views: 623 IT Port
Lock Compatibility in SQL Server
 
10:14
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.
Views: 367 IT Port
Concurrency vs Parallelism
 
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Clear the confusion about parallelism and concurrency, and what tools Java provides to enable each concept. Channel ---------------------------------- Complex concepts explained in short & simple manner. Topics include Java Concurrency, Spring Boot, Microservices, Distributed Systems etc. Feel free to ask any doubts in the comments. Also happy to take requests for new videos. Subscribe or explore the channel - https://youtube.com/defogtech New video added every weekend. Popular Videos ---------------------------------- What is an API Gateway - https://youtu.be/vHQqQBYJtLI Executor Service - https://youtu.be/6Oo-9Can3H8 Introduction to CompletableFuture - https://youtu.be/ImtZgX1nmr8 Java Memory Model in 10 minutes - https://youtu.be/Z4hMFBvCDV4 Volatile vs Atomic - https://youtu.be/WH5UvQJizH0 What is Spring Webflux - https://youtu.be/M3jNn3HMeWg Java Concurrency Interview question - https://youtu.be/_RSAS-gIjGo
Views: 17227 Defog Tech
Database Lesson #6 of 8 - Database Administration
 
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Dr. Soper gives a lecture on database administration. Topics covered include concurrent access / concurrency control, database security, database backup and recovery strategies, database locking (including optimistic locking, pessimistic locking, and deadlock), and database transactions.
Views: 95942 Dr. Daniel Soper
Confused by sp_who2 (Dear SQL DBA Episode 30)
 
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Learn why the output for the built in sp_who2 can be confusing, and better tools to get you more information, fast. Note: technical content begins about a minute into the video. Prefer a written version? Go to https://www.littlekendra.com/2017/02/16/confused-by-sp_who2-dear-sql-dba-episode-30/
Always Be Running: long running and fault tolerant java services with Mike Duigou
 
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For high availability services rebooting or stating a new instance is not a viable failure handling strategy. There are specific techniques and approaches needed to build fault tolerant, long running Java applications. This session will cover the experiences and approach used for developing and deploying resilient, fault tolerant code. We will look at exception handling, threads and pools, locking, timeouts, deadlocks, recovery, memory, logging, saturation/runaways, resource hogs, manual repair of running systems, and yes, when a reboot is your best option. The presenter works on the on-vehicle software for the Liquid Robotics Wave Glider, an autonomous marine data collection platform that often spends months at sea and previously worked on the Java team at Oracle, on robotics, autonomous systems and peer-to-peer network services projects at Sun Microsystems.
Views: 559 NightHacking
Graphical Chaining
 
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Event Manager's advanced chaining features enable you to quickly and easily define dependencies and workflows involving SQL Agent jobs, Windows Tasks and/or Oracle jobs. Send an email or initiate another automated response based on conditions specific to the entire chain, such as success, failure, or runtime thresholds. Find more information about our products: Event Manager: http://www.sqlsentry.com/event-manager
Views: 81 SentryOne
DB connection resilience in PowerCenter
 
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This video provides an introduction in DB connection resilience along with the steps and demo for the same.
Views: 674 Informatica Support
What's Adaptive Query Processing in SQL Server? (Dear SQL DBA Episode 21)
 
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Learn about emerging features to speed up SQL Server queries. Kendra talks about automatic index tuning and speculates about Adaptive Query Processing. Prefer a readable transcript? Get it here: https://www.littlekendra.com/2016/11/03/whats-adaptive-query-processing-dear-sql-dba-episode-21/
Debugging sql server stored procedures
 
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debugging in ssms debugging t-sql code t sql debug stored procedure sql server management studio debug stored procedure how to debug t sql debug in sql server management studio In this video we will discuss how to debug stored procedures in SQL Server. Setting up the Debugger in SSMS : If you have connected to SQL Server using (local) or . (period), and when you start the debugger you will get the following error Unable to start T-SQL Debugging. Could not connect to computer. To fix this error, use the computer name to connect to the SQL Server instead of using (local) or . For the examples in this video we will be using the following stored procedure. Create procedure spPrintEvenNumbers @Target int as Begin Declare @StartNumber int Set @StartNumber = 1 while(@StartNumber [ @Target) Begin If(@StartNumber%2 = 0) Begin Print @StartNumber End Set @StartNumber = @StartNumber + 1 End Print 'Finished printing even numbers till ' + RTRIM(@Target) End Connect to SQL Server using your computer name, and then execute the above code to create the stored procedure. At this point, open a New Query window. Copy and paste the following T-SQL code to execute the stored procedure. DECLARE @TargetNumber INT SET @TargetNumber = 10 EXECUTE spPrintEvenNumbers @TargetNumber Print 'Done' Starting the Debugger in SSMS : There are 2 ways to start the debugger 1. In SSMS, click on the Debug Menu and select Start Debugging 2. Use the keyboard shortcut ALT + F5 At this point you should have the debugger running. The line that is about to be executed is marked with an yellow arrow Step Over, Step into and Step Out in SSMS : You can find the keyboard shortcuts in the Debug menu in SSMS. Let us understand what Step Over, Step into and Step Out does when debugging the following piece of code 1. There is no difference when you STEP INTO (F11) or STEP OVER (F10) the code on LINE 2 2. On LINE 3, we are calling a Stored Procedure. On this statement if we press F10 (STEP OVER), it won't give us the opportunity to debug the stored procedure code. To be able to debug the stored procedure code you will have to STEP INTO it by pressing F11. 3. If the debugger is in the stored procedure, and you don't want to debug line by line with in that stored procedure, you can STEP OUT of it by pressing SHIFT + F11. When you do this, the debugger completes the execution of the stored procedure and waits on the next line in the main query, i.e on LINE 4 in this example. To stop debugging : There are 2 ways to stop debugging 1. In SSMS, click on the Debug Menu and select Stop Debugging 2. Use the keyboard shortcut SHIFT + F5 Show Next Statement shows the next statement that the debugger is about to execute. Run to Cursor command executes all the statements in a batch up to the current cursor position Locals Window in SSMS : Displays the current values of variables and parameters If you cannot see the locals window or if you have closed it and if you want to open it, you can do so using the following menu option. Locals window is only available if you are in DEBUG mode. Watch Window in SSMS : Just like Locals window, Watch window is used to watch the values of variables. You can add and remove variables from the watch window. To add a variable to the Watch Window, right click on the variable and select "Add Watch" option from the context menu. Call Stack Window in SSMS : Allows you to navigate up and down the call stack to see what values your application is storing at different levels. It's an invaluable tool for determining why your code is doing what it's doing. Immediate Window in SSMS : Very helpful during debugging to evaluate expressions, and print variable values. To clear immediate window type ]cls and press enter. Breakpoints in SSMS : There are 2 ways to set a breakpoint in SSMS. 1. By clicking on the grey margin on the left hand side in SSMS (to remove click again) 2. By pressing F9 (to remove press F9 again) Enable, Disable or Delete all breakpoints : There are 2 ways to Enable, Disable or Delete all breakpoints 1. From the Debug menu 2. From the Breakpoints window. To view Breakpoints window select Debug =] Windows =] Breakpoints or use the keyboard shortcut ALT + CTRL + B Conditional Breakpoint : Conditional Breakpoints are hit only when the specified condition is met. These are extremely useful when you have some kind of a loop and you want to break, only when the loop variable has a specific value (For example loop varible = 100). How to set a conditional break point in SSMS : 1. Right click on the Breakpoint and select Condition from the context menu 2. In the Breakpoint window specify the condition Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/debugging-sql-server-stored-procedures.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/debugging-sql-server-stored-procedures_28.html
Views: 114499 kudvenkat
HADR Tutorial Part 7 - LOAD Copy Image contains both Table Data and Index Pages
 
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LOAD Copy Image contains both Table Data and Index Pages Happy Learning & Sharing http://db2luwacademy.blogspot.in
Views: 358 DB2-LUW-ACADEMY
DB2 Certificación, lock parte 1
 
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material de certificación de db2
Views: 168 jesus ambriz

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