Analyzing Lock Order Of Queries Against Same Table To Prevent Deadlocks
Aug 5, 2014
I need to discover the actual order in which locks are acquired on a table during a query.
This with a goal of analyzing the lock order of queries against the same table to prevent deadlocks.
I'm using SQL Server 2008 R2.
From Management Studio I execute:
begin transaction
<my query>
exec sp_lock
rollback transaction
In the output I see interesting information about which locks are acquired, but:
- are this locks ordered by the time they're acquired? That is, can I be sure that lock at row n is acquired before lock at row n+1?
- if not, how can I get this information?
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May 29, 2008
I'm going thru my application log, and just seeing what errors are popping up. I have a relatively intense search feature, thats causing alot of deadlocks.
Exception type: SqlException
Exception message: Transaction (Process ID 105) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
In general, what's the best way to resolve this ?
Should I see if I can apply "WITH (NOLOCK)" to my data ?
Any suggestions are greatly appreciated !
thanks again!
mike123
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Sep 13, 2007
Hi all.
How can I lock table with longtime query?
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Apr 21, 2015
I have the following MDX query:
SELECT NON EMPTY {[DateT].[Year].[Year].Members } ON ROWS,
NON EMPTY { [Measures].[Val] } ON COLUMNS FROM [MyDB]
I need to order the data by year, so I tried this query:
SELECT
NON EMPTY { Order ( [DateT].[Year].[Year].Members,Desc) }
ON ROWS,
NON EMPTY { [Measures].[Val] } ON COLUMNS
FROM [MyDB]
But it doesn't work.
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Jul 10, 2014
We recently upgraded to sql server 2012. We have xxx-D-011 as OLTP server and yyy-D-011 as distributor server.
The log is showing deadlocks every day between application queries/updates and replication jobs.
A fragment of the log about the deadlock is included below.
2014-07-10 15:31:05.94 spid13s deadlock-list
2014-07-10 15:31:05.94 spid13s deadlock victim=process37ced3498
2014-07-10 15:31:05.94 spid13s process-list
2014-07-10 15:31:05.94 spid13s process id=process37ced3498 taskpriority=0 logused=0 waitresource=OBJECT: 8:532249001:0 waittime=357 ownerId=860304057 transactionname=SELECT lasttranstarted=2014-07-10T15:31:05.090
[code]....
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Feb 9, 2006
When i process a order in table Orders_t i would like to check in storage_t if we defenetly have it in storage. .... if we have it in storage, i decrease the "amount" by 1 ..(amount -1), and process the order. Otherwise it will return nothing.
This is what i´ve come up with so far:
CREATE TRIGGER checkInStorage
ON orders_t
FOR INSERT, UPDATE
AS
DECLARE
@tOrderId char(3),
BEGIN
SET @tOrderId = (SELECT orderId FROM INSERTED)
--check if the amount in storage
IF EXIST(SELECT amount FROM storage_t WHERE orderId = @tOrderId and amount >= 0)
BEGIN --if it return true, i update the storage by decrease the amount with one
UPDATE storage_t
SET (amount = amount - 1)
WHERE orderId = @tOrderId
END
this doesn´t work...
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Jun 2, 2005
Hello,I am trying to begin a transaction is ASP.NET that acts as a temporary lock on a record so that another web user can not gain access to that row of information. My problem is that when I begin the transaction, if the user then closes out of the browser completely, the temporary lock that is put on my table from the transaction does not go away. Further, I have no idea if it will or if there is a time range you can specifiy to do so.What I am wondering is if anyone has ever tried this before, or does anyone have a definite answer to the following question, "If I begin a transaction, and then I do NOT rollback or committ that transaction, will it ever rollback on its own and if so where can I set this time frame?"Thanks in advance for any help.
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Feb 16, 2015
I have express edition [advance] of sqlserver 2008 r2 , is it possible to trace every event with out using profiler as u know it does not ship with it.
Basically i want to see how locks are taken and released in each isolation level when query is executed. I am using
SELECT resource_database_id, t.resource_type , t.resource_associated_entity_id,partitions.index_id,blocking_session_id,
indexes.name as index_name,o.name,
t.request_status, t.request_mode,t.request_session_id,
t.resource_description
[code]....
But i am not sure of the order becuase total_elapsed_time is same for many locks
like
resource_typeresource_associated_entity_idrequest_session_idrequest_modeindex_namenameresource_description
DATABASE051SNULLNULL
OBJECT209427886651Sch-SNULLwt
OBJECT209427886652IXNULLwt
PAGE7205759715088793652IXPK_wtNULL1:204815
KEY7205759715088793652XPK_wtNULL(4fb98fd9bfad)
DATABASE052SNULLNULL
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Jul 20, 2015
I need to search for such SPs in my database in which the queries for update a table contains where clause which uses non primary key while updating rows in table.
If employee table have empId as primary key and an Update query is using empName in where clause to update employee record then such SP should be listed. so there would be hundreds of tables with their primary key and thousands of SPs in a database. How can I find them where the "where" clause is using some other column than its primary key.
If there is any other hint or query to identify such queries that lock tables, I only found the above few queries that are not using primary key in where clause.
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May 24, 2008
I understand that I have to have a TOP statement to work with an ORDER BY in a subquery but I am unable to get it to work correctly...
I am using VS 2008 and it does throw a "TOP" error, but it does not go ahead and process it correctly like someone said it would in another post...
Is this possible or simply how do I accomplish the following?
Here is an example:
Code Snippet
SELECT ResultSet1.BCol2, ResultSet1.CCol2, ResultSet1.Expr1
FROM
(SELECT TableB.BCol2, TableC.CCol2, count(*) AS Expr1
FROM TableA
INNER JOIN
TableB ON TableA.ACol2 = TableB.BCol1
INNER JOIN
TableC ON TableA.ACol4 = TableC.CCol1 AND TableA.ACol5 = TableC.CCol4
WHERE (TableC.CCol2= 1)
GROUP BY TableB.BCol2, TableC.CCol2) AS ResultSet1
To...
Code Snippet
SELECT ResultSet1.BCol2, ResultSet1.CCol2, ResultSet1.Expr1
FROM
(SELECT TOP (10) TableB.BCol2, TableC.CCol2, count(*) AS Expr1
FROM TableA
INNER JOIN
TableB ON TableA.ACol2 = TableB.BCol1
INNER JOIN
TableC ON TableA.ACol4 = TableC.CCol1 AND TableA.ACol5 = TableC.CCol4
WHERE (TableC.CCol2= 1)
ORDER BY Expr1
GROUP BY TableB.BCol2, TableC.CCol2) AS ResultSet1
What am I obviously missing here?
Thanks a bunch.
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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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Jul 4, 2014
We have a highly transactional database. It was owned by a third party before but now both the database and the application is on our site and we are trying to improve this project. So, we have a big (902919 rows), heap table, which is getting bigger and bigger everyday and sometimes deadlocks occur. The table has only 4 columns, "token", "type", "value" and "cacheTime", unique index cannot be created. It has one index on "token"(char(36)) and "type"(varchar(50)) ("value" should also be included but it is nvarchar(max)).
<deadlock-list>
<deadlock victim="process670ba10c8">
<process-list>
<process id="process670ba10c8" taskpriority="0" logused="0" waitresource="RID: 6:1:14949918:1" waittime="417" ownerId="347523711" transactionname="SELECT" lasttranstarted="2014-07-01T17:43:35.233" XDES="0x117cf7da40"
[Code] ....
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Mar 24, 2006
We are experiencing a problem in SQL Server 2005 Standard Edition (on x86 & x64, RTM & SP1 CTP1). The problem is we have a view which does something like "CREATE VIEW myView;SELECT * FROM MyTable WHERE ISNumeric(MyVal)=1" when you do "SELECT * FROM myView" you see a dataset which only contains numeric values.
However it's clear that if you do "SELECT * FROM myView WHERE MyVal>5" that it is evaluating the >5 before the IsNumeric function (I assume as > is less costly than IsNumeric and thus it is more efficient this way). This didn't happen in Sql Server 2000 & 7.0.
My concern here is that how can you trust views if when you put evaluations on them they're working against a different dataset to that which you view if you do SELECT * ?
I am currently working with a workaround which is to simply put TOP in the sub-queries to force the execution order to that which I've defined. However this is nasty as I can't do TOP 100% as it gets optimised out and so instead I have to do TOP 999999999 or similar.
However my biggest concern by far is that even in "SQL Server 2000 (80)" compatibility mode the behaviour is not consistent wtih SS2000.
CREATE TABLE #Problem (idkey int IDENTITY(1,1), numinastr varchar(25))
INSERT INTO #Problem (numinastr) values ('1')
INSERT INTO #Problem (numinastr) values ('10')
INSERT INTO #Problem (numinastr) values ('25')
INSERT INTO #Problem (numinastr) values ('40')
INSERT INTO #Problem (numinastr) values ('>500')
INSERT INTO #Problem (numinastr) values ('600')
INSERT INTO #Problem (numinastr) values ('1000')
INSERT INTO #Problem (numinastr) values ('error!')
-- Note Lack of any non-numeric rows
SELECT numinastr FROM #Problem WHERE ISNUMERIC(numinastr)=1
-- This Command executes correctly
SELECT numinastr FROM #Problem WHERE ISNUMERIC(numinastr)=1 AND numinastr>15
--This one however is parsed incorrectly, with >15 being evalutated before ISNumeric
SELECT * from (
SELECT * FROM #Problem WHERE ISNUMERIC(numinastr)=1
) a where numinastr>15
-- Creating a view of SELECT * FROM #Problem WHERE ISNUMERIC(numinastr)=1 and
-- then querying that also gives the same error
DROP TABLE #Problem
I have been told (by an MVP) that you can't assume a specific execution order for queries. Do any DBA's out there really think this acceptable? I consider this a bug. If I put a query in as a sub-query or view, or if I bracket my where statement in such a way I expect it to respect what I've told it!
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Feb 4, 1999
Hi,
We are running SAP 3.1H on MS SQL server 6.5.
We are having serius problems with printing.
Here are some error messages from the system log.
Deadlock occurred
DB error 1205 at UPD access to table TSP02
MSGNO 1205, MSGSTATE 2,
SEVERITY 13 Your server
command (process id 92) was
deadlocked with another
process and has been chosen
as deadlock victim. Re-run
your commandsrvname SAPPROD :
procname
YR200000015BKH4037TSP02 :
line 2
Spool: RT_UPDATE error 1 for table TSP02
DB error 0 at UPD access to table TSP02
Spool: RT_UPDATE error 1 for table TSP02
DB error 0 at DEL access to table TST01
Database error: TemSe->XRTAB(5)->1 for table TST01
key [005]SPOOL25171 ,1
Database error: TemSe->XRTAB(5)->1 for table TST01
key [005]SPOOL25171 ,1
Some error in TemSe management
DB error 0 at DEL access to table TSP01
The system log is full of these errors, we have a lot of inconsistency's in the temse objects.
Can you tell me wat the solution is or cult be for this problem??
Kind regards,
Kris.
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Mar 5, 2014
Facing deadlock issues in my ETL job .
The driver table , which keeps track of what datamarts ran and for what date range gets updated frequently during the etl run . There can be as many as 250 updates issued on this table in a single second.
Now this table is a heap , and there are no indexes on it .
During these updates , we encounter deadlocks causing the ETL job to fail .
Will adding an index faciltate?
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May 19, 2015
I never paid much attention to this before but I noticed this today in a new table I was creating.
For tables defined in the tabular model the table properties have something like SELECT Blah FROM TableName ORDER BY Blah Then in the tabular model the table's data is in the same order it was ordered by in the data source for the table.
I have a date table I setup and I noticed it is NOT respecting the sort order.
I have it sorted by DateID which sorts with the oldest date first and newest date as last row.However, the table that is imported and stored in the data model is not in that order.
I can of course manually sort the rows in BIDS/DataTools, but I find this discrepancy odd.
Would this have negative impacts on the EARLIER function for example if the data rows are not in the order specified?
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Mar 27, 2008
Hi!
I recently run into a senario when a procedure quiered a table without a order by clause. Luckily it retrived data in the prefered order.
The table returns the data in the same order in SQL Manager "Open Table"
So I started to wonder what deterimins the sort order when there is no order by clause ?
I researched this for a bit but found no straight answers. My table has no PK, but an identiy column.
Peace.
/P
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Nov 11, 2003
I have an ASP.Net Web appplication with a Back-End SQL DB. There are 3 Tables; Users, Groups, and GroupMember.
The GroupMember table is used to link Users to Groups and consists of just two fields; userID and GroupID.
Here is a sample of some data:
User1 Group1
User1 Group2
User2 Group2
User3 Group1
User3 Group3
Users can belong to multiple Groups. However, you shouldn't be able to have the same user and group comobination more than once. for example:
User1 Group1
User2 Group2
User1 Group1
I can stop this kind of duplicate data entry by doing a lookup first (using asp.net) to see if the entry already exists but this seems cumbersome.
Is there a simpler way to prevent duplicate entries in a table using sql?
Thanks a lot,
Chris
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Feb 21, 2001
hi, If I have a table which contains customer names. I want to have some kind of process to validate any new insert record into the customer table. so if the inserted new customer already exist in the table I will get a message that say " Sorry , this customer name is already in the system " .... how can I do that,
I am using sql server 2000. thanks
Ali
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Sep 20, 2006
hi..
How do i prevent other users from changing the data of my tables? Means one can change data using only my login rest others cannot even DBA or also from server administrator
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Apr 26, 2007
In a situation where messages are coming in faster than they can be processed, at what point will service broker start up another queue_reader? Also, how do you prevent table locking if part of the processing of that message involves inserting or updating data in a table? We are experiencing this problem because of the high number of messages coming through, and I'm not sure what the best solution is - does service broker have some built-in support for preventing contention on a table when multiple readers are running? Or maybe a pattern that can be used to get around it?
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May 15, 2004
Hi knights,
Pls tell me how to analyzing the db log. I'd appreciate your help!
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Jun 3, 2015
I know there's an option in the SSMS to remove the hook at the option "Prevent Saving changes that require table re-creation".
But how can I set the option silent. I mean for instance at the setup or by a secret T-SQL command or setting a value in a hidden file? I don't want the user to open the options dialog.
I logged the registry by a tool and alas there was it. So the thing is to set the registry entry by our own setup after installing the SSMS.
[HKEY_CURRENT_USERSoftwareMicrosoftSQL Server Management Studio12.0DataProject]
"WarnTablesReCreated"=dword:00000001
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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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Feb 14, 2005
Well my question is how do i analyze db growth per day. is there a tool i can use or a method. I mean i do take a look at the task view and the files but per day it doesnt move in MB wich is weird since this is a warehouse and their are nightly loads to it inserting maybe 30000 record a night on avg.
Any help would be grately aprreciated.
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Apr 6, 2004
Has anyone written routines to analyze sysjobhistory? I'm looking for a tool/routine to analyze jobs for failures, trends (such as constantly increasing run times) and other information. It's not as straighforward as I had originally hoped it would be.
I am specifically prohibited from using any 3rd-party tools (too expensive per mgmt).
I would be grateful for any input/insight.
Regards,
hmscott
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May 2, 2008
Hi,
I found out that executing the procedure SP_INDEXOPTION and setting 'AllowRowLocks' to false i can prevent the sql server from locking rows in a table and 'AllowPageLocks' prevents from pages being locked. I need to preform same operation
in case of tables. I need to perform insertion operations concurrently and acquire required locks manually. Is there a way to stop sqlserver from acquiring locks on the table. I need to disable all the locks (row, page and table).
Thank you in advance.
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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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Nov 1, 2005
hi, i have an application that updates some records in sql tables, and i want to do a web application that updates records in the some database-table(sql) so, my question is how can i lock the row or table so i dont have concurrency problems.tnx in advance.
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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........
Rahul Jha
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Jun 5, 2008
Hi Gurus,
How can we know that particular table is locked.
Thanks,
ServerTeam
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Mar 21, 2006
Hai to all,
I want to lock a patricular table during my transaction is this possible, for Example
Create sp() as
BEGIN
Lock Table
Do Some work
Relaese the Lock
END
like this.
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Feb 10, 2008
Is there any way to lock tables in SQL Server?
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