Comments on: SQL SERVER – 2005 Locking Hints and Examples http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/ Personal Notes of Pinal Dave Thu, 09 Feb 2012 10:40:10 +0000 hourly 1 http://wordpress.com/ By: sudhi http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-203550 Thu, 24 Nov 2011 09:04:17 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-203550 hello sir,
Please help me. in my programme i m using sql 2008. when it run it multi user environment.if one person save a big invoice then my programme in all other systems are hanged untill he save the invoice. I know it s by db table lock. how to overcome it .pls reply. thanks in advance.

]]> By: Hari http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-197772 Thu, 17 Nov 2011 15:13:33 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-197772 Hi Pinal,

I am facing performance issue why processing the data. Here is what my data processing scenario. we process the data on daily basis (charges/Transactions)

1. We load the data into Temporary Tables (New) and Create the Transaction keys for the new records.
2. Then we merger the new data with Production Data (below logic we follow)
A. Insert the complete Production Data into TableB
B. Create Indexs on TableB
C. Delete old data if exists based on MDXkey with New Table
D. Insert New Data into TableB
E. Switch the Productiontable – TableA ,TableB to Production Table
F. Drop Table new, TableA

Questions:

1. Because of the above process we are facing lot issues in server level (Database server is getting crashed frequently) the reason for this is Lot of IO reads and taking lot of resources Is there any alternate way you can suggest me to process data

Thank you in Advance

Thanks

]]> By: madhivanan http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-178357 Thu, 13 Oct 2011 11:38:36 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-178357 1 For data accuracy you need to lock the table until data are inserted
2 It is not possible to create duplicate table

]]> By: Shankar http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-178255 Thu, 13 Oct 2011 05:52:36 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-178255 Hi Pinal,

We are having a problems with insert statements which locks the table while inserting the records and we cannot perform any other operations on that table at a time.. I have some questions regarding SQL Server 2000.

1> if one person inserting some records into the table that table will be locked and another person cannot access records from that table.. or another person trying to perform update or selecting records from that particular table. its not happening and he has to wait. Wat to do ? please help me with this..

2> is there any possibility that we can create duplicate table so that we can perform different operations like insert on one table and select or update on duplicated table…

]]> By: Shashikiran V http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-169222 Sun, 18 Sep 2011 08:36:49 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-169222 Hi Pinal,

I am facing one problem in one our application. Here we have table where we insert 400+ records every time. At the same time if any user performs a select operation on this, we are getting time out error and occurrence of deadlock.

When we select the records with nolock condition we are getting the records which are not locked. But this is not the actual solution to it.

This table consists of 500000 records altogether. Kindly suggest us a way to overcome of it.

Thanks.

]]> By: Ron http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-159505 Fri, 19 Aug 2011 13:20:59 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-159505 I have a database where I need to process 100+ queries on the same table per second. The query takes approx 20 milliseconds to run normally, but as I start to bring up more threads and do more simultaneous queries it starts to slow down to 200-2000 milliseconds. The more simultaneous queries I use the slower they all become. Is there any way to avoid this? I am using NOLOCK in the query, but was hoping you may have some tips to help me with this one.

]]> By: sreekanth http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-154061 Fri, 05 Aug 2011 09:29:16 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-154061 how to unlock d locked database

]]> By: Sanket http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-148649 Sat, 16 Jul 2011 04:42:30 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-148649 Hi pinal, u r doing good job, This blog helps me lot.

]]> By: SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Day 16 of 31 Journey to SQLAuthority http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-148618 Sat, 16 Jul 2011 01:31:52 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-148618 [...] Using the NOLOCK query optimizer hint is generally considered a good practice in order to improve concurrency on a busy system. When the NOLOCK hint is included in a SELECT statement, no locks are taken on data when data is read. The result is a Dirty Read, which means that another process could be updating the data at the exact time you are reading it. There are no guarantees that your query will retrieve the most recent data. The advantage to performance is that your reading of data will not block updates from taking place, and updates will not block your reading of data. SELECT statements take Shared (Read) locks. This means that multiple SELECT statements are allowed simultaneous access, but other processes are blocked from modifying the data. The updates will queue until all the reads have completed, and reads requested after the update will wait for the updates to complete. The result to your system is delay (blocking). (Read more here) [...]

]]> By: naimish http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-147393 Mon, 11 Jul 2011 10:10:28 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-147393 hello sir,

i have two linked server.

i am trying to insert from one to another using sp but in all this process
one table is locked.

not even access the data from local server also can’t drop table
this table have one trigger afterinsert and using this trigger i maintain a
log that table also locked so trigger can’t drop or altered

so to release this what i have to do
help me…

]]> By: Rashmi http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-146799 Fri, 08 Jul 2011 04:43:58 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-146799 Hello sir,

Please tell me why we need nolock and working of rowlock.

]]> By: Narayana http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-146331 Wed, 06 Jul 2011 06:56:52 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-146331 Hello Sir,

Please can you help me on executing the ssis package from
trigger,as it’s going to an infinity loop .

]]> By: Susendran http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-145428 Sun, 03 Jul 2011 02:54:35 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-145428 Hello sir,

I am susendran,i new to sql i want to lock my stored procedure and when i want nedd to modify it please give me idea

]]> By: adamtuliper http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-144878 Thu, 30 Jun 2011 13:45:31 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-144878 I’d recommend editing your text up top to remove that nolock is the default for SELECT or specify up top its the default only for read uncommitted. I know you mention this in your reply below this is the case, but since READ UNCOMMITTED is not a usual default this is quite misleading when you first read this post as witnessed by several replies in this thread

]]> By: nisha http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-136198 Mon, 23 May 2011 11:58:56 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-136198 here i read a row
select name from emply where id=19
and nxt if i try to read d same row it should be locked..i shouldnt be able to read it…can u suggest me how to achieve this hibernate

]]> By: Rejith http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-134993 Wed, 18 May 2011 13:10:05 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-134993 We have some deadlock issue while updating a set of tables in a single transaction.if multiple users are trying to update same table at same time, it gets locked. Could you please give a solution for this

Thanx in advance

]]> By: Rohit Kumar Choudhary http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-130347 Thu, 21 Apr 2011 11:14:16 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-130347 Hi Pinal,
I want to know how one can view and remove locking on DBOs in SQLServer and also how to decide on which table to be removed off locking (if is deadlocked) without loosing data.

“Thanks in advance P.Dave.”

]]> By: aman http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-128527 Tue, 12 Apr 2011 21:07:58 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-128527 Hello,

We are migrating from sql server 2000 to sql server 2005. When running the advisory stats, the below error message was given for an particular SP.

In SQL Server 2005, with some exceptions, table hints are supported in the FROM clause of a query only when the hints are specified using the WITH keyword.

Below is the query in the SP, here an index has been specified to be used.

Select cw.FundID from BRCallPaymentWork cw (INDEX = NonIdx_FourKey_BrCallPayment) where cw.FundID = cp.FundID and cw.InvestorID = cp.InvestorID and cw.ParentID = cp.ParentID and cw.ChildID = cp.ChildID and cw.amountcalled = cp.amount

I believe in 2005 we need to use an hint , can u please help me how will this work?

Your help will be appreciated.

thanks,
aman

]]> By: Ravinder Pal Singh http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115533 Tue, 01 Feb 2011 13:14:05 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115533 select * from users (with rowlock) where userid=’141′

]]> By: Ravinder Pal Singh http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115532 Tue, 01 Feb 2011 13:13:06 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115532 It should be WITH(HoldLock)

]]> By: Ravinder Pal Singh http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115531 Tue, 01 Feb 2011 13:11:16 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115531 Hi Kapil,

The syntax is incorrect. Use WITH(HoldLock) rather than (WITH HoldLock).

Query will become:

select * from projects WITH (HOLDLOCK)where pj_id=1

Same is for (WITH ROWLOCK). Use WITH (ROWLOCK).

Query will become:

Select * from users WITH (ROWLOCK) where userid=141

]]> By: swapnil sawant http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115092 Sat, 29 Jan 2011 05:22:35 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115092 hey pinal,
thank u very much for such a great post…….. it’s fabulous.
I need to ask u one question.

suppose if i am using rowlock in following manner

SELECT OrderID
FROM Orders WITH( holdlock , ROWLOCK)
WHERE OrderID =100

then can u please tell me ….. untill how much it will hold this lock . because as soon as i execute this query ; simultaneously i can select the same query from another page. that means it is not holding a lock …

SO PLEASE ME HELP OUT…….
PLEASE REPLY ME AS SOON AS POSSIBLE
THANKS IN ADVANCE

]]> By: swapnil http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115091 Sat, 29 Jan 2011 05:20:53 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-115091 hii pinal,
thank u very much for such a great post…….. it’s fabulous.
I need to ask u one question.

suppose if i am using rowlock in following manner

SELECT OrderID
FROM Orders WITH( holdlock , ROWLOCK)
WHERE OrderID =100

then can u please tell me ….. untill how much it will hold this lock . because as soon as i execute this query ; simultaneously i can select the same query from another page. that means it is not holding a lock …

SO PLEASE ME HELP OUT…….
THANKS IN ADVANCE

]]> By: Rafay http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-114656 Thu, 27 Jan 2011 11:09:49 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-114656 hi!!
i want to ask that how create a lock on login.
i as an administrator created a user and now i want to lock my login section in sql server 2000 can you tell me how can i do it.

REPLY!! ASAP…

]]> By: madhivanan http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-110978 Fri, 14 Jan 2011 12:03:32 +0000 http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/#comment-110978 It should be WITH (ROWLOCK)

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