Data Access :: Transactions And Table Locking
Sep 3, 2015
Multi user ASP.Net website, SQL Server backend.When using transactions to insert multiple rows into a table and then commiting them once you're happy that everything looks good, the table(s) gets locked before commiting.Basically, I want to perform updates and inserts under a transaction but still allow other users to carry on using the site and potentially the tables that are being used with the transaction.
Question: Is there a way to stop the table lock occurring and for SQL to just do a record lock?, thus avoiding blocking other users?I know that a possibility is to use Snapshot replication, but am a little worried about turning it on due to the small team we have for testing.
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Jan 7, 2008
Hi all,
I'm just testing an SSIS package and am having issues with dealing with locked records.
my situation is as follows:
my source table is oracle, my destination table is in SQL server. my data flow is a very simple update with a lookup transformation and then two OLEDB commands for update and insert.
On each of the OLEDB commands I have set the "command timeout" to 5 seconds (just for testing purposes). also each OLE DB command has a failure path that outputs to a flat file. I'm expecting that if the destination table/records is/are locked then after 5 seconds the record will be output to the flat file.
so to test this I begin a transaction on the destination table and don't commit it. then I start the SSIS job. it doesn't appear to even get to the OLE DB commands. it appears to stop at the beginning of the data flow task. the output window shows this:
"Information: 0x40043007 at Import from Phoenix, DTS.Pipeline: Pre-Execute phase is beginning."
but it just hangs there indefinately. the progress tab tells me that it get's from the validating stage and past the prepare for execute stage but hangs on pre-execute - 0 percent.
I've put the command timeout = 5 on everything that I can find. I've mucked arround with all the possible "validateExternalMetadata" properties even though I only guessed that it may be the cause. is there anything that I'm missing? where should I look next?
(yes it does work perfectly when there is no transaction locking the target table)
Cheers,
Andrew
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May 14, 2015
declare @error int, @rowcount int
select @rowcount = COUNT(1) FROM STG_BCDR;
while @rowcount > 0
begin
BEGIN TRAN Deletion
[code]....
Above code i try to delete records batch by batch to avoid table locking at BCDR table.total records in this BCDR table is 40,000 records. However I run the code at execution plan, the BCDR table still clustered index scan which means that the locking still happend.
If i change the delete top (5000)...... to delete top (5).... then thre is clustered index seek, which is good..The problem here is each time only delete top 5 records which is means it will realy take very long time to remove those data.
how to cater the situation inorder for me to delete those huge data without table locking happend. If table locking happend , then other user will not be able to access this table at the same time.
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Jul 23, 2005
I'm trying to figure out what happened.I have have two Tables in SQLServer called "Contacts", and "Jobs"Whenever someone changes a record in either table I update two fieldscalled "Modby" and "Moddt" with a trigger. The Trigger may alsocontain other things as well.Here's the wierd thing.If the Modby Moddt statement is the first statement in the trigger Idon't get a "record changed by another user" but if it comes later inthe trigger I do.I think it has something to do with the LockDelay Key but I'm not sure.Any Ideas?
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Jul 4, 2007
I've been working on this problem for days and cannot seem to figure it out. I'm using the Microsoft Access Driver in an ASP web page to try to update a database. I'm using adLockPessimistic, but it is acting like I'm using adLockOptimistic.
Before you ask, I'm using MDAC 2.8 SP2 on my Windows 2003 Server.
If I open two web pages at the same time, both trying to increment a counter in a database 100 times, the end result should be a value of 200. But in most trials, I get a number less than 200, like 187. It almost seems like it is not locked at all, ecept for the fact that I sometimes get an error telling me I can't update the data because it is locked by another user.
So... I can read OK, but not save because sometimes its locked by another user and sometimes the increment doesn't really increment, therefore it seems like I have adLockOptimistic instead of adLockPessimistic. I do get adLockPessimistic when I read back the lock type.
Any help would be great!
Code Snippet
for i = 1 to 100
if ( len(Request.Form("zipcode")) > 0 ) then
call LogImpression (38)
end if
next
Function LogImpression (CampID)
'This increments the impression counter for a campaign in the vendors database
On Error Resume Next
Set adoCon = Server.CreateObject("ADODB.Connection")
'adoCon.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ=" & Server.MapPath("accessdb/vendors.mdb")
adoCon.Open "DSN=vendorDB"
Set rsAddComments = Server.CreateObject("ADODB.Recordset")
strSQL = "SELECT vendors.impressions,vendors.ID FROM vendors WHERE ID=" & CampID & ";"
rsAddComments.CursorType = 2
rsAddComments.LockType = 2
rsAddComments.CursorLocation = 2
rsAddComments.Open strSQL, adoCon, 2, 2, adCmdTableDirect
if (NOT rsAddComments.EOF) then
Err.Clear
MyCount=CInt(rsAddComments.Fields("impressions")) + 1
rsAddComments.Fields("impressions") = MyCount
rsAddComments.Update
if Err.Number <> 0 then
'we had an error, row was locked
Err.Clear
MyCount=CInt(rsAddComments.Fields("impressions")) + 1
rsAddComments.Fields("impressions") = MyCount
rsAddComments.Update
end if
end if
rsAddComments.Close
Set rsAddComments = Nothing
Set adoCon = Nothing
end function
Thanks, Lee
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Mar 16, 2005
hello
i want to know how can i see user's logs?i meani want to know wich users have accessed wich tables and when thay have changed the data...
i know these information is in logfile..(i think so..i'm now sure)..but i'm sure these information should be save in sql..but i don't know how to find them..
Somayeh
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Oct 1, 2007
I'm trying to import data from Access table using DataFlow with TransactionOptions- Required.
I just want to "remove" (rollback) all records which my SSIS Dataflow inserts into SQL Server.
First I tried to use normal Jet 4.0 provider - but it causes strange error.
Then I tried to use .NET Jet 4.0 provider - it produces this error :
Code Block
[DataReader Source [540]] Error: System.InvalidOperationException: The ITransactionLocal interface is not supported by the 'Microsoft.Jet.OLEDB.4.0' provider. Local transactions are unavailable with the current provider. at System.Data.OleDb.OleDbConnectionInternal.EnlistTransactionInternal(Transaction transaction, Boolean forcedAutomatic) at System.Data.OleDb.OleDbConnectionInternal.EnlistTransaction(Transaction transaction) at System.Data.OleDb.OleDbConnection.EnlistTransaction(Transaction transaction) at Microsoft.SqlServer.Dts.Runtime.ManagedHelper.GetManagedConnection(String assemblyQualifiedName, String connStr, Object transaction) at Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSConnectionManager90.AcquireConnection(Object pTransaction) at Microsoft.SqlServer.Dts.Pipeline.DataReaderSourceAdapter.AcquireConnections(Object transaction) at Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostAcquireConnections(IDTSManagedComponentWrapper90 wrapper, Object transaction)
Any ideas how to do this? I really need transactions in my solution. With Excel file it works fine.
Thanks for help.
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Aug 11, 2015
SQL2008R2...Have a SPID that started yesterday and contained a command to drop a server audit. This did not finish (after 3hrs) so I killed the SPID. Problem is it's still there (sp_who2) and I think it's now blocking access to viewing editing logins within SSMS as I'm getting "Lock request time out period exceeded. (Microsoft SQL Server, Error: 1222)" when double clicking a login.Do I need to restart the instance as killing the "alter server" transaction (SPID=62) is not working? Code to show blocking transactions returns this.
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Dec 14, 2007
hi all,
is there any query to move certain data from a sql data to access table through query. i am having a requirement where i have to fetch the records from a sql table that falls within a specified range to a ms access table. is this possible through a query.
thanks
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Jun 9, 2013
I have two database(MYDB1 , MYDB2) on two different server's(SERVER1 , SERVER2) . I want to create an store procedure in MYDB1 on SERVER1 and get some data from a table of MYDB2 on SERVER2. How can i do this?
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May 28, 2015
how I can load the CSV file data into the sql server table. I know there are ways like bulk insert and other to load the csv file data into the table. But in my case the table doesn't exist and has to be created at the run time. With simple insert in temp table we do like select * into #temp from tablename and that creates the temp table. So. I need something like that which create the temp table and load the data into it. because the CSV file would have different number of columns and names so I can not create the table structure in advance. I have to create the table at run time.
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Feb 7, 2002
Gurus,
I am trying to execute this stored procedure when I try to change all occurences of a field in a table.
(
@Dept char(8),
@DDept char(8)
)
As
Set NoCOUNt On
Begin
Select '@DDept'
update phodept set fo_dept = @Ddept
where fo_dept = @Dept
update phone set fo_dept = @Ddept where fo_dept = @Dept
End
GO
The table/database is being used by others, generally in a read only mode.
via a VB 5.0 FE program.
The Stored procedure, when it is invoked, just hangs like it is waiting for exclusive use of the table.
Is there a way around it, without doing major surgery on the VB code?
Thanks.
Sam
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May 24, 2002
Hello,
I am working on the implementation of a database for my company and I have
a simple (I hope) question to ask.
I have the following stored procedure that will be running when I want
(actually when I want to delete a customer).
Do not mind if you do not understand what this procedure does... ;-)
Actually the Level8View is a VIEW of a nested table
(CustomerData->CustomerData).
CREATE Procedure DeleteCustomer
@ClientID INT
AS
UPDATE Level8View
SET UpCode = Level2, Level1=Level2, Level2=Level3, Level3=Level4, Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level1=@ClientID
UPDATE Level8View
SET Level2=Level3, Level3=Level4, Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level2=@ClientID
UPDATE Level8View
SET Level3=Level4, Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level3=@ClientID
UPDATE Level8View
SET Level4=Level5, Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level4=@ClientID
UPDATE Level8View
SET Level5=Level6, Level6=Level7, Level7=Level8
WHERE Level5=@ClientID
UPDATE Level8View
SET Level6=Level7, Level7=Level8
WHERE Level6=@ClientID
UPDATE Level8View
SET Level7=Level8
WHERE Level7=@ClientID
DELETE FROM Customers
WHERE ClientID=@ClientID
GO
I checked this procedure and works perfectly.
What I want to do is to somehow lock the WHOLE TABLE (CustomerData) or the
view (Level8View) before the Update statements and unlock it after the
delete statements.
I do not want to do a Row by Row lock, or Page by Page lock since the updates
in this table occur in the whole table and during that operation I do not
want other threads to issue SELECT, INSERT or UPDATE statements.
Can someone answer me how I can lock and unlock the whole view or table
please?
I will appreciate it for your answer. Thanks.
Yours, sincerely
Efthymios Kalyviotis
ekalyviotis@comerclub.gr
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Nov 11, 2005
I have a SP for an e-commerce site that creates an order doing the following fashion:
begin
-Fill out some variables
*Critical Section
-Create Order number
-While loop select on order table and recreate if ordernumber already exists
-Insert into order table
*End Critical Section
-Insert into order lines table, address table, etc.
commit
The problem is the Create Order number and While loop used to be at the top and occasionally I would get duplicate order numbers if two submitted at the same time. I rearranged it to the above and it happens less now.
My question is if there is a way to put an XLOCK on the orders table only during the critical section lines. Also my understanding is that once the insert into orders is done that the server will hold a lock until the commit in case of rollback.? I don't want to XLOCK the whole SP if I don't have to. It is quick though.
Thanks
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Apr 25, 2008
I need 2 unique sequential numbers to be stored in the same table. Obviously, for the first number I can use an auto-number field. For the second number, I would like to use a 2nd table with just 1 field that would only ever store 1 record. The idea being that if a user needs to generate a new unique number, they lock the 2nd table, lookup the current value, store the value in a variable for use, add 1 to the value of the number in the table, then unlock the table.
Presumably, I'd use something like this:
SELECT OrderNo
FROM tblUniqueOrderNumber (WITH TABLOCK)
Does this lock the table so no other users can read/write the table? If so, how do I unlock the table once I've updated OrderNo? What happens if another user then reads the table while it has a TABLOCK applied? I'm using SQL Server 2005 and the database is a multi-user database. I have a feeling I'm not going about this the best way possible, but I'd like to know how the table lock works eitherway.
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Apr 30, 2004
hi
can i lock my table while doing an updation so that all others in n/w can insert into the table only after my operation is completed?
if a user attempts to save/update the 'locked'table, will he get an error message or will his application (using ADO) will wait till the table gets unlocked?
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May 11, 2004
Can any one please tell me how to lock & unlock a table a from inside a store procedure using T-SQL
thanks
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May 6, 2008
hi,
I am running a sql job that select data from one database (multiple table) and inserts into another database (1 table)
I have a problem with the way it is locking the tables I am selecting from !
my query is like :
insert into testdb.dbo.tabletest
select * from
livedb.dbo.tablex
inner join liveb.dbo.table1 on tablex.id=table1.xid
It seems to be locking the table and blocking other users from accessing the table.
suppose my question is why is the select locking the table ?
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Jul 20, 2005
I want to insert values into a table and the same time select a valuefrom the same table.I insert a record of a parent type and use a function to create asubscriberType for the record.Next i insert a record of child type and want to select thesubscriberType from the parent record.This do not work when i useINSERT TABLESELECT ,Name,"function to generate subscribertype",.............I DO NOT WANT TO USE CURSOR!!
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Jul 2, 2001
I am trying to find a way to look at the size of each table in a database and the last time each table was updated/accessed by a user. I was just given control over a DB that is VERY BADLY maintained and I want to look at what I can get rid of in it. I want to start deleating by size and last used. I can find creation dates for the tables and row counts but not total size and last update/access of the tables. Does anyone know how to get this information?
Thanks,
Nathan
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Jun 13, 2008
how to rename table name in sql?i trid as likerename table table_name to new_table_namebut this raises an error
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Aug 27, 2007
Hello,
I have a Data Flow Source that uses a SQL Command to pull data. In the SQL statement, I used CAST to change all varchar types to Nvarvchar to suit MS Access. I can preview the data from the source. In testing, the SQL statement only pulls about ten records.
I have a Microsoft 2000 Access database table as a destination. Data in each column in the table is required, and all columns have defaults.
I also have a grid data viewer set up. I have the DefaultBufferMaxRows set to 2 so that I can see data going across. When I execute this dataflow, no data is transfered to the Access database table. No data shows up in the dataviewer. There are no errors. The 'Execution Results' tab does not show errors, but indicates that zero rows were transfered. There are no warnings.
How do I begin to isolate the problem? The following is the SQL Statement in the Data Flow Source. Thank you for your help! - cdun2
DECLARE @CategoryTable TABLE
(ColID Int,
ColCategory varchar(60),
ColValue varchar(500)
)
--and fill it
INSERT INTO @CategoryTable
(ColID, ColCategory, ColValue)
SELECT
0,
LEFT(RawCollectionData,CHARINDEX(':',RawCollectionData)),
LTRIM(SUBSTRING(RawCollectionData,CHARINDEX(':',RawCollectionData)+1,255))
FROM Collections_Staging
--Assign an ID to each block of data for each occurance of 'Reason:'
DECLARE @ID int
SET @ID = 1
UPDATE @CategoryTable
SET [ColID] = CASE WHEN ColCategory = 'Reason:' THEN @ID - 1 ELSE @ID END,
@ID = CASE WHEN ColCategory = 'Reason:' THEN @ID + 1 ELSE @ID END
--Then put the data together
SELECT --cast to Nvarchar for MSAccess
a.ColID,
CAST(a.ColValue as Nvarchar(30)) AS OrderID,
COALESCE(CAST(b.ColValue as Nvarchar(30)),'') AS SellerUserID,
COALESCE(CAST(c.ColValue as Nvarchar(100)),'') AS BusinessName,
COALESCE(CAST(d.ColValue as Nvarchar(15)),'') AS BankID,
COALESCE(CAST(e.ColValue as Nvarchar(15)),'') AS AccountID,
COALESCE(CAST(SUBSTRING(f.ColValue,CHARINDEX('$',f.ColValue)+1,500)AS DECIMAL(18,2)),0) AS CollectionAmount,
COALESCE(CAST(g.ColValue as Nvarchar(10)),'') AS TransactionType,
CASE
WHEN h.ColValue LIKE '%Matching Disbursement%' THEN NULL
ELSE CAST(h.ColValue AS SmallDateTime)
END AS DisbursementDate,
--COALESCE(h.ColValue,'') AS DisbursementDate,
CASE
WHEN i.ColValue LIKE '%Matching Disbursements%' THEN NULL
WHEN CAST(LEFT(REVERSE(i.ColValue),4)AS INT) > 1000 THEN CAST(i.ColValue AS SmallDateTime)
WHEN LEFT(REVERSE(i.ColValue),4) = '1000' THEN NULL
END AS ReturnDate,
--COALESCE(i.ColValue,'') AS ReturnDate,
COALESCE(CAST(j.ColValue as Nvarchar(4)),'') AS Code,
COALESCE(CAST(k.ColValue as Nvarchar(255)),'') AS CollectionReason
FROM @CategoryTable a
LEFT JOIN @CategoryTable b ON b.ColID = a.ColID AND b.ColCategory = 'Seller UserId:'
LEFT JOIN @CategoryTable c ON c.ColID = a.ColID AND c.ColCategory = 'Business Name:'
LEFT JOIN @CategoryTable d ON d.ColID = a.ColID AND d.ColCategory = 'Bank ID:'
LEFT JOIN @CategoryTable e ON e.ColID = a.ColID AND e.ColCategory = 'Account ID:'
LEFT JOIN @CategoryTable f ON f.ColID = a.ColID AND f.ColCategory = 'Amount:'
LEFT JOIN @CategoryTable g ON g.ColID = a.ColID AND g.ColCategory = 'Transaction Type:'
LEFT JOIN @CategoryTable h ON h.ColID = a.ColID AND h.ColCategory = 'Disbursement Date:'
LEFT JOIN @CategoryTable i ON i.ColID = a.ColID AND i.ColCategory = 'Return Date:'
LEFT JOIN @CategoryTable j ON j.ColID = a.ColID AND j.ColCategory = 'Code:'
LEFT JOIN @CategoryTable k ON k.ColID = a.ColID AND k.ColCategory = 'Reason:'
WHERE a.ColCategory = 'Order ID:'
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Aug 21, 2007
We have a MS SQL database with an Oracle linked server 'ALTTEST'
We can Select, Insert, Delete and Update tables on the Oracle Db using OpenQuery, but how do I apply a table lock with a transaction?
I've tried applying the code below, but it doesn't work.
Any help appreciated.
BEGIN TRAN
SELECT * from openquery(ALTTEST,'select LAST_PIN_NUMBER from sys_params') WITH (TABLOCKX)
COMMIT
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Oct 3, 2007
So randomly every 1 to 6 days queries start timing out and I'm almost positive it's from an improperly terminated transaction
Is there a way to snoop this out the next time it happens? Like when a table's locked I can look and see yea this is the transaction it's in the middle of?
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Mar 25, 2006
Hi,
im developing an application for my university final year project and i want to lock the table before the query executes to ensure that no other changes are allowed (sorry if im confusing)
So my question , really does anyone know how to do this and is it possible ?, for example in coldfusion a query is surrounded with cflock or something similiar.
Appreciate any and all help guys
Many thanks in advance
andy
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Aug 5, 1999
Hi
Is a TABLOCK HOLDLOCK in a transaction the best way for locking a table for a brief period of time?
We need to get generate a unique serial number each time a certificate record is printed. We have in place a field called Field_SERIAL_NUMBER for each certificate record, which may be printed 1 time or 100 times. Each time it prints, we will insert a unique number into the Field_SERIAL_NUMBER field.
This is what I'm thinking to approach this.
- Create a new table called Table_SERIAL with one field called Field_NUMBER which has only 1 record set to 1.
- Every time a certificate is printed, we
1. Begin transaction
2. Select @number = Field_NUMBER from Table_SERIAL with a TABLOCK HOLDLOCK
3. Insert that number into the Field_SERIAL_NUMBER field in the certificate table
4. Increment @number by 1
5. Update Field_NUMBER with @number in Table_SERIAL
6. Unlock table
So, everytime the Field_NUMBER is pulled, it should be unique and incremented by 1.
Does this approach sound good?
Joyce
4. Increment
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Oct 20, 2005
Hi,
is there anyway i can run delete statements on an audit table that will not lock the whole table?
As it is an audit table, when i run the delete query, the whole application freezes until the delete query is complete.
the process is taking several minutes as the table is approx 40M rows, the where clause in the delete is indexed but thats it really.
any thoughts greatly appreciated by my system users!
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Apr 4, 2007
Hi,
I want to insert a record in a table having an identity column as primary key. I want to lock the table while inserting. so that no one should be able to insert, select, update, delete from the table. and once my insert is over, then will release the lock.
Can I have the code for the same. M using SQL SERVER 2005.
Thanks,
Rahul Jha
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Jul 23, 2005
Hi All,I am using a SQLTransaction to insert records into a table. At onetime, there are 5000 or more records to be inserted one by one. Ittakes some 20-25 mins for the entire process to run.Another application accesses the same table.As long as the insert process within the transaction isn't completed,the second application is not getting any response from the server. Ieven tried to run a SELECT on the table in SQL Query Analyzer while theinsert process was running and it also did not respond till the timethe insert process finished!Is this normal that a transaction is locking up a table? How do Iovercome it? I am using IsolationLevel.ReadUncommitted for thetransaction.If I do not run the process within a SQLTransaction, the second processor running the SELECT in Query Analyzer does not hang.Thanks,Sanjeev Mahajan
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Jul 20, 2005
SQL Server 2000, MSDE 2000I have a procedure in my application that I would like only one user at atime to be able to run. Is there a TSQL command I can run that willesentially lock a set of tables so others cannot access the table until theuser is done with the procedure or until the user disconnects from thatsession (in case of a hung app, I would like to lock released)TIA--Tim Morrison--------------------------------------------------------------------------------Vehicle Web Studio - The easiest way to create and maintain your vehiclerelated website.http://www.vehiclewebstudio.com
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Oct 12, 2007
I feel like I read about a new ability in SSRS 2005 to be able to lock the position of a table's header row (when viewing through the report viewer) so that it does not scroll out of view when scrolling down long report. Now that I need it, I have not been able to find any information about it. Does anyone have any information about this feature or know if this feature exists?
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Aug 10, 2006
Hi,
I have the following doubt about table lockinglocking in case of partitioning:-
Say we have 5 partition on the table Employee on the key Joining_Date and when we run 5 select queries on each of the parition in parallel will there be locking on the table when the 1st query is running or all the 5 queries can run in parallel. Basically, I am trying to see if parallelism and partitioning can work in sync or there will be locking at the table level if I don't specify any query hints?
Any help in this regard is highly appreciated.
Thanks,
Ritesh
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Apr 5, 2007
How do I get a System Table like 'Sysobjects' into the Data Access Layer?
My app generates tables on the fly, and has to check in the sysobjects table which tables are present.
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