Lock Hint Question
Jul 20, 2005
Hi All,
I have a question about lock hint for you :
If the first user currently run a select command
with share lock and hold it. What kind of
lock (lock hint) should be used by the second user
in the select command (from the same table) so that
this command will wait until the first user releases
the lock ?
I have tried using tablock, tablockx, xlock and
updlock hint in the select command for the second
user, but it is not successful. Below is my
unsuccessful test :
The first user :
Begin Transaction
select fprefix from ut1 where fprefix = '000'
The second user :
select * from ut1 with (tablockx)
Please help me
Thanks in advance
Anita Hery
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Aug 1, 2007
Can I use the NO Lock hint when running a SELECT against a view that points to another server? Will the no lock "travel" to the other server through the view?
amk
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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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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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Apr 7, 2004
Hi
We are facing an acute situation in our web-application. Technology is ASP.NEt/VB.NET, SQL Server 2000.
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 :
Transaction (Process ID 78) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction
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?
Please advice. Thanks a bunch.
Pankaj
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Jan 3, 2007
Query hints exceed maximum command buffer size of 1023 bytes(1029 bytes input).
i tried a long query in BCP because i have to insert a character to one of its fields.
hope somebody had encountered and solved this (sql server 2000). thanks in advance..
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Sep 26, 2013
Is possible to use like hint with subselect? , i mean i want to find all rows in table A that contains a word in a field(CALLED CONTENT) in table B, concretely in a field called content too, i show you the idea although the syntax is incorrect.
select
' + char (39) + @country + char (39) + ' as PAIS,
A.ID,
A.IDUSUARIO MSISDN,
NULL AS MSISDN_COD,
convert(char(19),A.FECHA_ALVENTO, 121) AS FECHA_MO_LOCAL,
NULL AS FECHA_MO_LOCAL_D,
[code]....
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Jul 20, 2005
Background:I am currently working on a mission critical web based applicationthat is accessed 24 hours a day by users from just about every timezone. We use MS SQL Server as our database and we have lots ofproblems with time-outs. We used to have lots of problems with locksuntil my management decided that we would use the WITH (NOLOCK) hinton EVERY select statement and WITH (ROWLOCK) on EVERY updatestatement. I have argued since the beginning that the NOLOCK hintshould be the exception and not the rule. Meanwhile we continue tohave problems related to time-outs.Problem:I'm the one that they call when there are time-out errors.I am a programmer first and a DBA when I have to be. I'd really liketo hear from some of you who are the opposite. I realize that thereare many factors that contribute to slow response from a databaseserver (indexes, RAM, disk speed, etc.), but what I really need tohear from an expert is whether or not using NOLOCK on **EVERY** queryin a 30GB database that has 344 tables is a bad idea.Thanks in advance,Stephen McMahonJoin Bytes!
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May 22, 2006
Hi,
I have set of 2 DTS packages, one of which calls the other by forming a command-line (dtexec) using a Execute Process task.
From the parent package-> Execute Process Task->
dtsexec /F etc... /<pkg variable> = "servername"
Each of the parent and the called package have a variable: "User::DWServerSQLInstance" which is mapped to the SQL server connection manager server name property using an expression. The outer package has the above variable and so does the inner called package (which gets assigned through the command line from the outerpackage call to inner)
I "sometimes" get the following error:
OnError,I4,TESTDOMAdministrator,ACDWAggregation,{A1F8E43F-15F1-4685-8C18-6866AB31E62B},{77B2F3C7-6756-46EB-8C01-D880598FB4B3},5/22/2006 5:10:28 PM,5/22/2006 5:10:28 PM,-1073659822,0x,The variable "User::DWServerSQLInstance" is already on the read list. A variable may only be added once to either the read lock list or the write lock list.
Help would be appreciated!
I have seen other posts on this but, not able to relate the solution to my scenario.
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Nov 27, 2007
Hi all
If i have a view:
CREATE VIEW vw_Users
AS
SELECT * FROM Users WITH(NOLOCK)
Is it suggested to use nolock in views?
And if i needed to use this view in stored procs is it then suggested to apply the nolock hint?
CREATE PROC [dbo] .[usp_GetCompanyUsers]
AS
SELECT * FROM Companies WITH(NOLOCK) JOIN
vw_Users WITH(NOLOCK) --<< ---is this suggested?
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Sep 26, 2013
Is possible to use like hint with subselect? , i mean i want to find all rows in table A that contains a word in a field(CALLED CONTENT) in table B, concretely in a field called content too, i show you the idea although the syntax is incorrect.
select
' + char (39) + @country + char (39) + ' as PAIS,
A.ID,
A.IDUSUARIO MSISDN,
NULL AS MSISDN_COD,
convert(char(19),A.FECHA_ALVENTO, 121) AS FECHA_MO_LOCAL,
NULL AS FECHA_MO_LOCAL_D,
[code]...
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Sep 28, 2007
Can someone give me the right syntax for using an index hint in a delete statement as below?
DELETE table1 WITH (INDEX('indexname_IX'))
WHERE datecolumn < @datevariable
I get this error message:
Incorrect syntax near the keyword 'index'.
I'm using Query Analyzer in SQL 2000 Enterprise.
Thanks,
Gerald
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Apr 10, 2002
Hi there,
I need to get back the actual characters (without trailing blanks) contained in a char(43) field.
So i tried:
- substring(fieldname,1,len(fieldname)) which yields a 43 char column
- using a variable that contains the actual length in
substring(fieldname,1,@nchar)) the same.
- tricking by concatenating the resulting string with a dummy like "" didn't
work either.
So apparently I am at a dead end.
Anybody a clue, hint or solution????
Thanks to all contributors
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Jun 8, 2001
We are discovering that adding Force Order to a query is substantially increasing performance. Any issues around using this ?
Craig
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Jul 12, 2006
According to what I see in BOL, the following should work:
delete
from dbo.tbl1 WITH (INDEX(idx_un01))
where tbl1_no = 1
Yet when I syntax check this I get:
Msg 1069, Level 15, State 1, Line 2
Index hints are only allowed in a FROM clause.
(Please ignore the fact that index hints are unnecessary / a bad idea / etc.)
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Aug 7, 2007
Hi,
I want to implement the following pattern (pseudo-code follows):
[for index in x different databases, where x is rather big]
create database MyDatabase_#{index}_Temp
launch a dedicated ssis package on this database
if I detect no error, proudly rename MyDatabase_#{index}_Temp to MyDatabase_#{index}_Last_Known_Good (drop the last_known_good first if it exist)
Later on, a consolidation process collect the data in Last_Known_Good versions of the databases.
My question: what is the simpliest way to achieve the rename operation (step 3) ?
I have tried an "alter database #{old_database_name} modify name = #{new_database_name}", but it works only once: once renamed, the database keeps the old mdf and ldf filenames, and the next create database will choke on this.
I have also tried to rename the logical filenames with ALTER DATABASE XXX MODIFY FILE (NAME = YYY, NEWNAME = ZZZ) but it doesn't work either.
I'd like to avoid specifying absolute mdf and ldf filenames myself, is it possible ?
best,
Thibaut
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Oct 25, 2006
An interesting discussion yesterday. One of the programmers asked about the use of the NOLOCK optimizer hint with an iterator table aka table of numbers. His comment was that this optimizer hint was not efficient. Rather than give a knee-jerk response I thought it would be better to ask. The main circumstance is that the iterator table is completely static with a fill factor of 100%. My purpose is to eliminate lock contention if I can.
Are there reasons to not use the NOLOCK hint in this case to potentially improve performance?
Dave
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May 10, 2006
Hi All,
I have seen a few other people have this error.
Package works fine when run from BIDS, DTExec, dtexecui. When I schedule it, It get these random errors. (See below)
The main culprit is a variable called "RecordsetFileDIR" which is set using an expression. (@[User::_ROOT] + "RecordSets\")
A number of other variables use this as part of their expression and as they all fail, pretty much everything dies.
I have installed SP1 (Not Beta) on server. Package uses config files to set the value of _ROOT.
The error does not always seem to be with this particular variable though. Always a variable that uses an expression but errors are random. Also, It will run 3 out of 10 times without a problem. I am the only person on the server at the time.
Any ideas?
Cheers,
Crispin
Error log:
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073659822,0x,The variable "User::RecordsetFileDIR" is already on the read list. A variable may only be added once to either the read lock list or the write lock list.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073639420,0x,The expression for variable "rsHeaderFile" failed evaluation. There was an error in the expression.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636247,0x,Accessing variable "User::rsHeaderFile" failed with error code 0xC00470EA.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1071636390,0x,The file name is not properly specified. Supply the path and name to the raw file either directly in the FileName property or by specifying a variable in the FileNameVariable property.
OnError,,,DF_Header_Header,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,Move All Data,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,Load Open Batches and Process Files,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
OnError,,,POSBasketImport,,,10/05/2006 12:03:34,10/05/2006 12:03:34,-1073450901,0x,"component "rsHeader" (365)" failed validation and returned validation status "VS_ISBROKEN".
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Sep 27, 2005
My God! What happens if I miss a step, or put it in a different order??? I know I can specify ORDER BY StepID, but what about a missing step? I do have "missing ranges" script, but posting questions filtered through the script process may become a full-time job in itself...What to do, what to do...
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Jul 20, 2005
Hi All,I want to lock 2 tables on 2 servers using TABLOCKXhint. These tables function as semaphores in myapplication. It means when the tables are lockedthen other users will not be able to access themand automatically they can not continue their works.I have tried using the following code, but itdoes not work. I always got the error :"Cannot specify an index or locking hint fora remote data source" on the select command.begin transelect * from server1.accounting.dbo.semtabwith (tablockx) where fprefix = '000'select * from server2.accounting.dbo.semtabwith (tablockx) where fprefix = '000'--commit tranThe error will disappear if I remove the servername, like this :select * from accounting.dbo.semtabwith (tablockx) where fprefix = '000'But, it does not meet my requirement.It only locks one table on one server(default).Please help meThanks in advanceJohn S.*** Sent via Devdex http://www.devdex.com ***Don't just participate in USENET...get rewarded for it!
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Nov 28, 2007
Hello!
I would like when I compare query plans to be able to compare
2 queries where the 1. is the "normal" version and the 2. the version where I forced compiler
not to use a specific index (i don't want to force at table scan, so hint index(0) can't be used).
The only way I see how I could achieve something similar is to to drop the index and compare response time
before and after. But building index could be time consuming...
Is it possible?
select col42 from tbl;
select col42 from tbl with...
pressing CTRL+L
Greetings
Bjørn
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Feb 22, 2007
I've got a dilemma which I hope someone has a solution to.
Let's say we're building a data mining model to predict aircraft reliability. In the training table we've got a column (among many others) with a unique aircraft ID, and then a column for the type (737,747) and then a column for the series (100,200,300). I.E. A 737-800 series would be "737" and "800".
There is in essence a parent-child relationship between these 2 columns. 737's should share a common set of reliability factors, and then those factors might be further defined by the series number (for instance, the 737 might have very reliable radar except for the 500 series). The series is analogous to what model year a car is. What I want to make sure doesn't happen is for the system to correlate a 747-400 and a 737-400 because they are the same series. They are totally independent if the model number is different.
My only idea was to merge the columns and have a single value "737-100". But it would seem then that the model won't have any idea that a "737-100" and "737-200" should have a lot more in common than a "737-100" because the values will be completely different.
I was hoping to find some sort of parent-child hint in the column properties but found none.
What solutions have other people tried? It sure seems that there should be an elegant solution for something like, but I'm missing it.
Geof
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Apr 25, 2007
Hello
we have two SqlServer 2005 in cluster. The machines act very slow (although the CPU load is low) as soon as we achieve one of these operations:
- drop / create database
- restore database
We achieve those operations through the SqlServer Browser or via sqlcmd.
Everything else is running smoothly.
Is there any known reason on why it can be so slow ?
best regards
Thibaut
(hope this is not too OT, but could not find any cluster-specific forum).
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Jul 22, 2015
I am setting up filtered replication(tran repl) for a table that is 2+ TB in size. The filtered rows are less than 1% of total size.When I run the snapshot, sometimes it complete in 27 mins(I have already optimized the snapshot agent profile) and sometimes it runs for ever. Mostly it runs forever, so the chances of it finishing soon are really very less.I have infact created filtered index just to cater to the query in the filter i.e. on the filter predicates. The reason its flipping flopping is due to the incorrect plan that it chooses. I can force the right index and the filtered query runs just fine but. I cannot use the query hints when I am adding the filter in replication as its not allowed.
I then went ahead and created the plan guides to force the best plan. But the plan guide was not used because even if there is a single space in the actual query that replication runs in the background the plan guide will not be used(testing on plan guides has proved this). The query needs to be ditto same including whitespaces and carriage returns. I then ran profiler and found that there is a view that replication creates and executes to extract the filtered rows and BCP it. Got the text of the view and created the plan guide on it but it was still not used because sp_helptext output seems to be different than what is actually being fired by replication internally.
Further, I collected the verbose log with level 2 and tried to find out if the main query shows up there with no success.
(a) I can't use the plan guide because I do not know the exact syntax(I mean I have the query but I do not know the white spaces, carriage returns, etc) and
(b) I cannot use query hint while filtering the article.
1. I cannot afford to have downtime.
2. I cannot use backup and restore option either.
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Jul 11, 2006
Hi,
I am stuck with that error when running my ASP.NET application on my production server for many weeks now and still don't have a complete solution to that problem.
I formerly posted that thread and read that other thread without success, so as I have made a few progress in delimiting the problem I am posting this new thread with the hope somebody will finally be able to help me.
To summarize:
1) I have developed an ASP.NET application,
- on a Windows XP Pro SP2 computer
- with VS studio 2005 Dev and included SQL 2005 engine
- this application works fine on the dev computer
2) I have deployed the application on a production server which is:
- a Windows 2000 SP 4 computer
- with SQL Express SP1 with Advance services installed
When I launch the prod application I have this error:
Login failed for user xxxxASPNET
I have found that I can bypass this error by doing the following:
1) manually attach my .mdf database with SQL Server Management Studio Express and specifying the field Attached as with myDatabaseName (in place of the default fullPhysicalPath/myDatabaseName.MDF) then detach it
2) change the auto generated connection string in web.config file from
<add name="ConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|myDatabaseName.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/>
To
<add name="ConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|myDatabaseName.mdf;User ID=sa;Password=mySAPassword;database=myDatabaseName" providerName="System.Data.SqlClient"/>
That would have been an acceptable substitution solution but unfortunately my
application also uses the new Login and Webparts features of VS 2005 which implies the automatic creation of an ASPNETDB.MDF database by VS.
As I have no mean (or at least don't know how) of modifying the associated Connection String for that database (it does not appear in web.config) I cannot bypass the problem for it and thus the error still appears when the application try to use this database.
Please I really need help on this matter, I can provide any other useful information as needed (logs, sources ...)
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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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Dec 23, 2014
I have two select statements, in between select statement taking UNION ALL . I need to avoid the error
Warning: The join order has been enforced because a local join hint is used.
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Apr 21, 2008
Hi,
*** Skip all and go to last 2nd para for main question ****
We have our custom ETL tool that loads data in SS 2005 Enterprise Vesion using BCP. We use '-h "TABLOCK"' table hint and '-b 10000' batch size options.
Prior to 2005 Enterprise version (2K and 2K5 Standard Versions), we use to maintain around 10 DBs with same schema/sps and views in each of the dbs.
Now, in Enterprise version we are maintaining one DB where all tables are partitioned by one column.
Multiple instances might run from different workstations. Here, I want to clarify you that no instance will load data pertaining to another partition.
But at the same time there will be other components running that will query the tables in a SELECT sql and all tables have NOLOCK table hint.
There can be multiple instances of this component running from different workstations. Again, none of the instance will not access data pertaining to another instance (including the component that is loading data)
I have no clue why we some times get deadlock issues when we run multiple instances of custom ETL tool for loading data and other component that just has select only sql.
More over I get deadlocks many times only in BCP, this is a puzzle to me because i use NOLOCK table hint. This is the only place where table is populated by data and data in table neither updates or deleted.
Can some one tell which of these below concurrent transactions will get conflicts and leads to dead lock?
bcping data into table of partition A
bcping data into table of partition B
deleting few rows of data from table of partition E
updating few rows of data from table of partition F
querying table of partition C
querying table of partition D
Thanks
- D
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Sep 18, 2006
Hello everyone,I have a web project where users access a aspx page to view information stored in an SQL database.My client want that one user can access a row of information and see it, all other users shouldn't be able to view or update the same row?it means whenever a row of data is displayed by some user, this row should be locked even for beeing viewed by all other users, when this user close this page, this row will be available. ?I should do this in code behind or something in sql...How can I do that???
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Oct 6, 2003
I remember there's a command you can type into SP . so no one else can see your SP even the SA. can anyone tell me what's the command is thanks!!
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Mar 27, 2001
Hello,
An application we are designing is behaving rather strangely. Basically, we
have a trigger on SQL 2000 on W2K Server watching for a record update. When
that happens a stored procedure gets executed which in turn spawns a VB that extracts that record, applies some rules to it, and writes a text file to disk. 9 out of 10 times, this program will cause a CPU spin, and it can't be killed from the Task Manager.
I did not write the VB app, I am writing the front end for the application in ColdFusion, but I need some ideas on what might be causing such behavior and how can the problem can be diagnosed. Thanks for any help!
Stas Newdel
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Sep 3, 2007
Is it good practice to use WITH (NO LOCK) on SELECT statements, ie
SELECT * FROM MyTable WITH(NO LOCK)
Or does the SQL Server optimiser automatically use WITH (NO LOCK) ?
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May 30, 2006
Hi,
i have a big problem , i work with sql 2000 on windows 2000.
When user do a select against my database sqlserver lock all the table and nonoe can work.
Haw can i change the isolation level for a ropw and for all the db.
Thanks.
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