Exclusive Insert Lock On A Table

Sep 10, 2007

Hello All!

I want to perform 4 or 5 statements as a transaction but I need to make sure that during this complete transaction no one else inserts or deletes records from a table named SomeTable.

So how can I lock MyTable at the beggining of the transaction so that during my transaction no one else can insert or delete anything in table SomeTable?

Thanks!

David

 

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Is It Possible To Read Data From A Table With Exclusive Lock ?

Sep 4, 2006

Hello,

We currently use SQL Serv 2000 with an ERP application and VB applications.

Both system work with the same database & tables but the ERP application seems to put exclusive lock on all tables it needs during processes. So our VB applications are not able to read these data and we receive TIMEOUT error.

What can I do ?

thank you

Nico

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Exclusive Lock During A SELECT

Aug 9, 2000

Anybody know how a SELECT statement can generate an exclusive lock on a table ?
I always thought that SELECT's take out shared locks. Is this something to do with temporary tables generated by ORDER BY's and DISTINCT ?
Rogue SQL below (from Site Server).

SELECT A.i_Dsid, A.i_Aid, A.vc_Val, A.i_Val, A.dt_Val, A.img_Val FROM Object_Attributes A, ( SELECT DISTINCT L.i_Dsid FROM Object_Lookup L , Object_Attributes OA2 (index = IND_vc_Aid) WHERE ((( L.i_ObjectClass = 9999 )) AND ( OA2.vc_Val LIKE ( '999999999.9999999%' ) AND OA2.i_Aid = 99)) AND (L.i_Container_Dsid = 99) AND ( OA2.i_Dsid = L.i_Dsid )) AS B WHERE B.i_Dsid = A.i_Dsid AND A.i_Aid NOT IN( 1, 2, 3, 4, 5 ) ORDER BY A.i_Dsid, A.i_Aid

Can anybody suggest a workaround ? Thanks.

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Can You Place An Exclusive Row Lock Using A Hint?

Feb 21, 2000

Hi,

Is it possible to place an exclusive row lock when running a SELECT query by using a lock hint (or otherwise).

Basically, when a select statement is run against a table I don't won't any other users to read that row until it has been updated - at some later stage.

Any suggestions on whether this is possible would be welcome.

Thanks,

Karl

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Inserts Resulting In Exclusive Key Lock

Apr 1, 2004

I'm relatively new to SQL and I've come across something that doesn't seem quite right. When an insert becomes part of an transaction I notice an exclusive KEY lock in Enterprise Manager. The table in question was using a Clustered index but I changed that, dropped the table and brought it back in but I still get the lock which keeps all others out of the table. Is this the expected behavior or is there something I am missing? Could the size of the tabe affect things? This is a very small table currently. I'm using MSSQL 7 sp3.

Thanks,
John

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Deadlock -select With Exclusive Lock

May 12, 2008

Hi ,
I have some issues with deadlock.I am getting deadlock becuase of two
select on same table. The sql server log is like this ,
Select statements should have always shared lock.I am not getting why
its doing exclusive lock and creating deadlock.


5/6/2008 12:38 spid4s Unknown Deadlock encountered €¦. Printing
deadlock information
5/6/2008 12:38 spid4s Unknown Wait-for graph
5/6/2008 12:38 spid4s Unknown Log Viewer could not read information
for this log entry. Cause: Data is Null. This method or property
cannot be called on Null values.. Content:
5/6/2008 12:38 spid4s Unknown Node:1
5/6/2008 12:38 spid4s Unknown KEY: 9:72057594050117632 (8d036f07c58f)
CleanCnt:3 Mode Flags: 0×0
5/6/2008 12:38 spid4s Unknown Grant List 3:
5/6/2008 12:38 spid4s Unknown Owner:0×12E9F160 Mode: S Flg:0×0 Ref:1
Life:00000001 SPID:68 ECID:0 XactLockInfo: 0×353D1C54
5/6/2008 12:38 spid4s Unknown SPID: 68 ECID: 0 Statement Type: SELECT
Line #: 4
5/6/2008 12:38 spid4s Unknown Input Buf: Language Event: (@actDefId
nvarchar(36)@stateList varchar(1)@stateList1 varchar(1)@procRelObjType
smallint@procRelObjIdList varchar(36))
5/6/2008 12:38 spid4s Unknown Requested By:
5/6/2008 12:38 spid4s Unknown ResType:LockOwner Stype:€™OR€™Xdes:
0×2FBB67F0 Mode: X SPID:112 BatchID:0 ECID:0 TaskProxy0×0792E378)
Value:0×38baa20 Cost0/11888)
5/6/2008 12:38 spid4s Unknown Log Viewer could not read information
for this log entry. Cause: Data is Null. This method or property
cannot be called on Null values.. Content:
5/6/2008 12:38 spid4s Unknown Node:2
5/6/2008 12:38 spid4s Unknown KEY: 9:72057594049986560 (6f02e1cd37c3)
CleanCnt:3 Mode:X Flags: 0×0
5/6/2008 12:38 spid4s Unknown Wait List:
5/6/2008 12:38 spid4s Unknown Owner:0×12396EE0 Mode: S Flg:0×2 Ref:1
Life:00000000 SPID:90 ECID:0 XactLockInfo: 0×0AA8178C
5/6/2008 12:38 spid4s Unknown SPID: 90 ECID: 0 Statement Type: SELECT
Line #: 4
5/6/2008 12:38 spid4s Unknown Input Buf: Language Event: (@actDefId
nvarchar(36)@stateList varchar(1)@stateList1 varchar(1)@procRelObjType
smallint@procRelObjIdList varchar(36))
5/6/2008 12:38 spid4s Unknown Requested By:
5/6/2008 12:38 spid4s Unknown ResType:LockOwner Stype:€™OR€™Xdes:
0×353D1C30 Mode: S SPID:68 BatchID:0 ECID:0 TaskProxy0×13B3E378)
Value:0×12e9e780 Cost0/6164)
5/6/2008 12:38 spid4s Unknown Log Viewer could not read information
for this log entry. Cause: Data is Null. This method or property
cannot be called on Null values.. Content:


If you have any idea regarding this please let me know ASAP.


Thanks in advance .

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Insert Should Aquire Only Exclusive Rowlock. Why Does Insert Block Select With ( Updlock, Rowlock )?

Mar 12, 2007

Here is the situation i am stuck with, see the example first and below explained the problem:

-- 'SESSION A

create table foo (

id integer,

pid integer,

data varchar(10)

);

begin transaction

insert into foo values ( 1, 1, 'foo' )

insert into foo values ( 2, 1, 'bar' )

insert into foo values ( 3, 1, 'bozo' )

insert into foo values ( 4, 2, 'snafu' )

insert into foo values ( 5, 2, 'rimrom' )

insert into foo values ( 6, 2, 'blark' )

insert into foo values ( 7, 3, 'smeg' )

commit transaction

create index foo_id_idx on foo ( id )

create index foo_pid_idx on foo ( pid )

begin transaction

insert into foo values ( 9, 3, 'blamo' )

-- 'SESSION B

begin transaction

select id, data from foo with ( updlock, rowlock ) where id = 5;



-- Problem:

-- Uncommitted transaction in session A, with insert into table FOO, aquires lock on index foo_pid_idx which BLOCKS select with ( updlock, rowlock ) in session B.

-- Insert should aquire only exclusive rowlock. Why does insert block select with ( updlock, rowlock )?



Appreciate your help,

Rajesh.

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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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Jul 23, 2005

Howdy, all. We have a (log-type) file that's constantly being writtento. We need to grab the latest rows out of this file, insert them intoa table, and then process them. We've found out the hard way that BCPlocks the file while it's inserting, so rows can't be written to thefile while the BCP is running.Our current workaround is to make a copy of the file (using ftp), butwe're running into other problems.I'm trying to find a better way to do this. We've narrowed down acouple.1) use TAIL or something similar to grab the records since we last ran.2) use BULK INSERT, provided it doesn't lock the file.3) get suggestions off of USENET. :)Any suggestions or comments?Thanks,Michael

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Insert And Update With Trigger Causing Lock

Feb 20, 2008

Hi,
I'm taking an Excel spreadsheet (that could have around 30k rows) and processing it in SSIS. I essentially have a flag in one of the spreadsheet cols that indicates whether the record is already in the database or not.

I'm splitting the data using a conditional split on this column and using a OLE DB Destination (Fast Load) to perform the inserts and a OLE DB Command to fire a stored procedure to perform any updates. Both the OLE DB Destination and the stored procedure are hitting the same table and the two operations could be executing at the same time as they both appear directly after the Conditional Split, so the OLE DB Destination is set NOT to lock the table.

This seemed to work OK until recently. I've just added 2 triggers onto the table in question which I don't want to fire 30,000 times during the import. As the OLE DB Destination is set to use Fast Load, it doesn't fire the triggers - cool. In the update stored procedure it disables the trigger before performing it's update and re-enables the trigger when finished. Currently this does mean that if you only had updates, the trigger could be enables/disabled 30,000 times. That sounds kinda bad, but I don't really know if this carries a large overhead or not?

If, when importing now you have both updates and inserts the whole process locks up. From looking at activity monitor, it seems as though the INSERT gets suspended.

Do I have a fundamental problem with how I've structured the Data Flow or am I just being really stupid in Enabling/Disabling a trigger that many times, which is probably causing the problem?

Thanks in advance.

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Bulk Insert Data In Millions - Lock Issue

Oct 11, 2005

Hi all,Hope there is a quick fix for this:I am inserting data from one table to another on the same DB. Theinsert is pretty simple as in:insert into datatable(field1, field2, field3)select a1, a2, a3 from temptable...This inserts about 4 millions rows in one go. And since I had the'cannot obtain lock resources' problem, several methods were suggestedby some web sites:1) one to split the insert into smaller chunks (I have no idea how Ican spit a insert to insert only n records at a time..)2)to use waitfor - which I did but did not fix the error.3)use bulk insert (in t-sql) - I dont know how to do this?As I see I am simply trying to move data from one table to another(ofcourse lots of data) in SQL Server 2000 and I dont see one simplesolution to the locking problem.any ideas on how best I can do this will save my day!thanks all.

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Aug 28, 2007

Hi

I am using conditional split Checking to see if a record exists and if so update else insert. But this cause database dead lock any one has suggestion?

Thanks

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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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Jul 23, 2004

Hi,all:
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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!!!
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Nov 1, 2005

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Nov 4, 2004

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Oct 14, 2005

How can i give a table wise exclusive lock in MSSQL Server ?

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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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Folks,

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Oct 6, 2007

Hi All

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