Comments on: SQL SERVER – Detailed Explanation of Transaction Lock, Lock Type, Avoid Locks http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/ Personal Notes of Pinal Dave Mon, 13 Feb 2012 15:11:24 +0000 hourly 1 http://wordpress.com/ By: shovon http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-250145 Wed, 08 Feb 2012 21:16:36 +0000 http://sqlauthority.wordpress.com/?p=845#comment-250145 Hi Pinal Dev,
we have SQL Server 2008 R2 Enterprise Edition x64

Do we have to enable Locked Pages?

No:
Locking pages in memory is not required on 64-bit operating systems.
http://msdn.microsoft.com/en-us/library/ms190730.aspx.

Yes

http://support.microsoft.com/kb/918483

]]> By: Jat http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-178926 Fri, 14 Oct 2011 18:07:51 +0000 http://sqlauthority.wordpress.com/?p=845#comment-178926 I have a application with three window services running to import, import process and print files in a folder. Once I got deadlocks I’ll get more later. But after I reboot sql server all lock are gone so I don’t get deadlocks. It looks like once I got deadlocks, locks are not released.
I know they are working on a couple of table. How to remove those locks from a table? Thanks

]]> By: Kanchan Mishra http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-150782 Tue, 26 Jul 2011 11:24:35 +0000 http://sqlauthority.wordpress.com/?p=845#comment-150782 Begin T1:
Update T1 set Col2 = ‘C2′ where Col1 = 3 — means the 3rd row is updated
Waitfor delay ’000:00:20′ — delay for 20 secs
–meanwhile T2 begins

Begin T2
Update T1 set Col2 = ‘C3′ where Col1 = 3 –3rd row is updated
– This update while not happen untill T1 ends ie takes close to 20 secs to happen

The behaviour is same for both Read committed and Repeatable read isolation levels
Then where does the difference between the two in handling Lost Updates

]]> By: SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Day 16 of 31 Journey to SQLAuthority http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-148616 Sat, 16 Jul 2011 01:31:49 +0000 http://sqlauthority.wordpress.com/?p=845#comment-148616 [...] reads the uncommitted data modification.(Read more here) [...]

]]> By: kamal http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-128589 Wed, 13 Apr 2011 03:14:34 +0000 http://sqlauthority.wordpress.com/?p=845#comment-128589 lock sql server 2008

]]> By: pramod sharma http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-97801 Thu, 04 Nov 2010 11:11:58 +0000 http://sqlauthority.wordpress.com/?p=845#comment-97801 hii

]]> By: Dhananjai http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-76279 Tue, 15 Jun 2010 05:11:33 +0000 http://sqlauthority.wordpress.com/?p=845#comment-76279 Using bcp command you can genrate any format u want.
byeeeeee

Dhananjai Pratap Singh

]]> By: Sunil http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-75063 Mon, 07 Jun 2010 12:47:11 +0000 http://sqlauthority.wordpress.com/?p=845#comment-75063 How can we insert a record into the database object ( Table ) from a program which is locked because of update statement on same table.

]]> By: SQL SERVER - 2008 - Interview Questions and Answers - Part 7 Journey to SQL Authority with Pinal Dave http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-47480 Thu, 26 Feb 2009 12:07:21 +0000 http://sqlauthority.wordpress.com/?p=845#comment-47480 [...] Reads the uncommitted data modification. (Read More Here) [...]

]]> By: Kushal Kumar http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-44902 Thu, 18 Dec 2008 06:35:56 +0000 http://sqlauthority.wordpress.com/?p=845#comment-44902 Hi,

Excellent…
please provide some more knowledge about Level-2,3,4 also.
It will be very helpful.

Thanks,
Kushal

]]> By: Praveen http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-43918 Sun, 26 Oct 2008 20:16:10 +0000 http://sqlauthority.wordpress.com/?p=845#comment-43918 Thanks buddy

]]> By: cer http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-43461 Thu, 02 Oct 2008 20:18:37 +0000 http://sqlauthority.wordpress.com/?p=845#comment-43461 Jitendra:
Actually there are 5 isolation levels in SQL Server 2005 and newer, but only 4 in SQL Server 2000, since SNAPSHOT is not an option there.
Excellent post, as usual from Pinal Dave.
Thanks.

]]> By: rakesh http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-43326 Sun, 28 Sep 2008 03:53:53 +0000 http://sqlauthority.wordpress.com/?p=845#comment-43326 concept is crystal clear

]]> By: Scott Herbert http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-42713 Fri, 12 Sep 2008 06:37:53 +0000 http://sqlauthority.wordpress.com/?p=845#comment-42713 I’m glad you’ve noticed that mistake about READ UNCOMMITTED, as I was about to get really confused.

]]> By: Imran Mohammed http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-42618 Wed, 10 Sep 2008 03:12:44 +0000 http://sqlauthority.wordpress.com/?p=845#comment-42618 @ Jitender,

I agree

Level 0 : Read uncommited (lowest level)
Level 1: Read committed which is default.

I think I wrote it by mistake. Thanks for correcting me…

Thanks,
Imran.

]]> By: Jitendra Luniya http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-42596 Tue, 09 Sep 2008 13:55:34 +0000 http://sqlauthority.wordpress.com/?p=845#comment-42596 Hi,

There is some wrong information published in the content. It’s said that “level1 is the default isolation level of the database.” and also mentioned level1 is READ UNCOMMITED.

Actually there are 5 isolation levels as
READ UNCOMMITTED
READ COMMITTED
REPEATABLE READ
SNAPSHOT
SERIALIZABLE

and READ COMMITED is default level.

Thanks – JL

]]> By: guy vann http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-42564 Mon, 08 Sep 2008 21:16:28 +0000 http://sqlauthority.wordpress.com/?p=845#comment-42564 Imran Mohammed

thanks for the information on Transaction Lock , I was what we were looking for

]]> By: guy vann http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-42444 Fri, 05 Sep 2008 15:44:16 +0000 http://sqlauthority.wordpress.com/?p=845#comment-42444 We have a SQL application, If someone in one site opens it before anyone else is using it, no one else can open the program.
it gives this error “another program is using this file”

]]> By: Palani http://blog.sqlauthority.com/2008/08/18/sql-server-detailed-explanation-of-transaction-lock-lock-type-avoid-locks/#comment-41902 Fri, 22 Aug 2008 05:06:44 +0000 http://sqlauthority.wordpress.com/?p=845#comment-41902 Hi

How to generate select statement output into Excel or textual output

Please Let me know, is it possible?

by
Palani

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