Lock SQL Table Using Asp.net

Jul 23, 2004

Hi,all:


This problem almost drives me crazy, hope I can get some hints from you guyz!!!


Ok, here is the situation:


I wanna only one users 2 modify the data(update) from my page each time, and if at the same time, there are some other users connecting my database through .aspx page, they can only browse the data until the first users finish updating.


It seems I need to implement locking the database, but I am not sure how I am gonna do that using asp.net!!!


Thanx in advance!

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How To Lock A Table So Others Cannot Lock It

May 23, 2001

Hi,

I want to lock a table so others cannot lock it but able to read it inside transactions.

The coding I need is something like this: set implicit_transactions on begin transaction select * from table1 with (tablock, holdlock) update table2 set field1 = 'test' commit transaction commit transaction

I have tried the coding above, it won't prevent others from locking table1.

So, I changed the tablock to tablockx to prevent others from locking table1. But this will also prevent others from reading table1. So, how can I lock table1 so others cannot lock it but still able to read it?

Thank you for any help

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Feb 2, 2007

I simply made my script task (or any other task) fail

In my package error handler i have a Exec SQL task - for Stored Proc

SP statement is set in following expression (works fine in design time):

"EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"

From progress:

Error: The Script returned a failure result.
Task SCR REIL Data failed

OnError - Task SQL Insert Error Msg
Error: A deadlock was detected while trying to lock variable "System::ErrorCode, System::ErrorDescription, System::ExecutionInstanceGUID, System::StartTime, User::FEED_ID, User::t_ProcessedFiles" for read access. A lock could not be acquired after 16 attempts and timed out.
Error: The expression ""EXEC [dbo].[us_sp_Insert_STG_FEED_EVENT_LOG] @FEED_ID= " + (DT_WSTR,10) @[User::FEED_ID] + ", @FEED_EVENT_LOG_TYPE_ID = 3, @STARTED_ON = '"+(DT_WSTR,30)@[System::StartTime] +"', @ENDED_ON = NULL, @message = 'Package failed. ErrorCode: "+(DT_WSTR,10)@[System::ErrorCode]+" ErrorMsg: "+@[System::ErrorDescription]+"', @FILES_PROCESSED = '" + @[User::t_ProcessedFiles] + "', @PKG_EXECUTION_ID = '" + @[System::ExecutionInstanceGUID] + "'"" on property "SqlStatementSource" cannot be evaluated. Modify the expression to be valid.

Warning: The Execution method succeeded, but the number of errors raised (4) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.

And how did I get 4 errors? - I only set my script task result to failure

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Nov 1, 2005

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Nov 5, 2007

Hello Friends,
I am having a VB application running for the SQL SERVER DB. The VB application is installed on the multiple of PCs in the network. Now when I am trying to fetch the same from all the different PCs simultaneously, its amazingly fast. But the issue comes when I am trying to update the same table (but different rows) from the different PCs simultaneously. The time taken is directly proportaional to the number of users. I am not getting what could be the problem? Can any one suggest me the approch? Is it some related to table / row / page locking? As all the connections are trying to update on the same table. I checked the isolation level. Its default, "READ COMMITTED". Kindly suggest...




Thanks in advance........
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Jun 5, 2008

Hi Gurus,

How can we know that particular table is locked.



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Mar 21, 2006

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like this.

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Feb 10, 2008

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Jul 23, 2005

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Nov 21, 2007

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May 6, 2008

Hi Friends

In my server i am getting this error how can i slove this error
could u people any body please help me

error:
Table Lock Wait Time Per Second is 867.3330
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Oct 3, 2000

Hi,

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Nov 4, 2004

Hi,
I am working on a project which need to produce a sequential certificate number, Everytime I need a new certificate number, I need to find out what is the max number in the database and then the new certificate number just max+1.
But how can I block another
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set cert_info=Server.CreateObject("ADODB.RecordSet")
cert_info.Open cmdTemp, , AdOpenKeySet, adLockOptimistic
If Not cert_info.EOF then

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End if
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Oct 14, 2005

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I got the description but, How can I apply this ?
The sql :
LOCK TABLE <tablename> IN EXCLUSIVE MODE
is not working.

Is there any query/method to do this ?
Please help ...

thanks


About Exclusive locks
--------------------
Exclusive (X) locks are used for data modification operations, such as UPDATE, INSERT, or DELETE.

Other transactions cannot read or modify data locked with an Exclusive (X) lock. If a Shared (S) exists, other transactions cannot acquire an Exclusive (X) lock.
--------------------

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Feb 5, 2004

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Mar 12, 2004

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BEGIN TRANSACTION

UPDATE forum WITH (TABLOCKX)
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WHERE forum_id = @forum_id

SELECT @new_id = forum_last_used_msg_id
FROM forum
WHERE forum_id = @forum_id

COMMIT TRANSACTION

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(1) - (4)
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Thanks,
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Jul 27, 2007

Folks,

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2)any ideas on optimizing the query?

Here is the query:

UPDATE Customers
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Thx
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Oct 6, 2007

Hi All

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We have disabled the lock table option in the target( in the insert flow)
The first set of records which come for updates flow fine.
But when the records start coming into the insert flow, the data flow stops.

Is this a table lock issue?
How do i set the commit interval at the update flow?
can someone lpease help me out of this situation

Thanka and Regards
Preethe

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Jul 23, 2005

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Dec 6, 2005

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Sep 11, 2007

Hi!
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Maybe you have an better alternative, then let me hear ;-)

Or should I use "begin transaction"...

Thanks for help

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Oct 26, 2006

Hi!

I'm new in SQL and I´ve been the problem bellow:

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Example:

** At open of the invoice:

SET ISOLATION LEVEL READ UNCOMMITTED

BEGIN TRANSACTION

SELECT * FROM INVOICE WITH (ROWLOCK UPLOCK) WHERE ( ID = 15 )

******* at the end of invoice:

INSERT INTO INVOICE ........

COMMIT TRANSACTION

END



******* The relationship are:

INVOICE <>> ITENS_INVOICE

ITENS_INVOICE <>> PRODUCTS

CUSTOMER <>> INVOICE

VENDORS <>> INVOICE

Just the INVOICE and PRODUCTS record´s involved in Transaction are lock. ( The CUSTOMER and VENDORS are not locked for example )

But I need that just INVOICE record be locked.

Thank´s for all and sorry my English.



Igor Sane

São Paulo - Brazil

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Apr 7, 2004

Hi
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Consider a scenario in which User 1 is clicking on a button which calls a SQL stored procedure. This procedure selects Group A of records of Database Page1.

At the same time if User 2 also clicks the same button which calls same SQL stored procedure. This procedure selects Group B of records of Database Page1.

So, its the same Page1 but different sets of records. At this moment, both the calls have shared locked on the Page1 inside the procedure.

Now, in call 1, inside the procedure after selecting Group A of records, the next statement is and update to those records. As soon as update statement executes, SQL Server throws a deadlock exception as follows :

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We are able to understand why its happening. Its because, Group A and Group B of records are on the same Page1. But both the users have shared lock on the Page1. So, no one gets the exclusive lock in records for update, even though, the records are different.

How can I resolve this issue? How can I get lock on wanted rows instead of entire page?

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Pankaj

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Sep 10, 2007

Hello All!
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Thanks!
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Apr 17, 2008

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Apr 9, 2003

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Jan 29, 2004

Hi,

I have some questions about locking tables in stored procedures. I got some excellent tips from my last post, but since it's sort of a different problem I figured I'd post it separately.

I have a large log table I need to do manual, periodic clean-up process on, which basically is purging unneccessary log-entries. The idea is to select out the 1-3% I need to another table, drop the old table, and rename the new table to the old one.

The problem is that I most likely will need to lock the entire table while I do all the clean-up stuff. If a client manages to add things inbetween this is going on, I could end up loosing data.


The table looks like this:
Logid PK
LogTypeID -- what category
LogValue --
LogTime -- when it occurred

My imaginary stored procedure looks something like this:

CREATE PROCEDURE ShrinkDB AS
-- 1)
"lock table log" -- do I have to do something like this?

-- 2)
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(
logtypeid <> 2020 AND -- activity played
logtypeid <> 5020 AND -- database connected
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)
-- 3)
drop table log

-- 4)
EXEC sp_rename 'log_keep', 'log'
GO

I'm not able to figure out wether I need to run some sort of "Lock" command or not, or if everything inside a stored procedure automatically is locked. If so, I shouldn't worry about loosing any data I guess??


Hopefully it works that way, but if not I assume I'll run into these two problems:

- If a client logs immediately after the Selecet, could data be logged AFTER the select, but BEFORE the drop table-command? In which case I guess I would loose data?

- Immediately after the drop table log in step 3, there's no table named 'log' in my database. 'Log' will be "created" when I run step 4. This means I could perhaps loose data since the client for a brief moment can't log data to the 'log' table?


Hopefully someone can clearify this for me, I've read the documentation, but I don't feel too sure on this subject.... :-)

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Hi,

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