How To Avoid Deadlock With Simple Update Statements
Aug 29, 2007
I searched a bit but didn€™t get too far in actually solving a case of deadlock in a simple query I have running here. The queries in question are executed under 2 separate transactions (Serializable IsolationLevel) and are shown below. I guess I don€™t understand how those 2 can deadlock because they are operating on different rows of the table and Serializable should keep them isolated pretty well too. Is it because I€™m using the column value inside an update stmt? How should this query be split if that€™s the case?
This is what the SQL Profiler has to say:
Lock: Deadlock Chain Deadlock Chain SPID = 59
Lock: Deadlock Chain Deadlock Chain SPID = 57
Lock: Deadlock my_user_name
57: UPDATE CreditCard SET Balance = Balance - 200 WHERE (Account = 0 AND CardHolder = 'Foo' AND Balance - 200 >= 0)
59: UPDATE CreditCard SET Balance = Balance - 250 WHERE (Account = 3 AND CardHolder = 'Bar' AND Balance - 250 >= 0)
I also used DBCC TRACEON(1204, 3605, -1) but I don€™t understand what the SQL log is telling me. Can anyone shed some light on why the above 2 statements sometimes cause the following:
System.Data.SqlClient.SqlException: Transaction (Process ID 57) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
I really don't want to retry the update if I don't have to. Table looks like:
Column DataType Length
Account int 4
CardHolder char 64
Balance float 8
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Jan 2, 2008
I am tring to execute the simple update query in query analyiser but after some seconds process got block by the same process(DEADLOCK).
query:
update tablename
set col1 = 0
Other info may help you:
Database had 3 different primary data files. In these files, first two files restricted file growth option is selected and there size is full. Only third file has space and option to grow.
Table containts total 50 columns and 15 milion rows.
Please help me to solve this ASAP.
Thanks in advance.
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Oct 11, 2007
Hi,
Please help with the below deadlock problem :
We are using SQL Server 2000. Our application is a J2EE based. We use Java v 1.5 ,EJB 3.0 ,JBoss-4.2.0 and have sqljdbc.jar v 1.1 driver (to connect to sql server from jboss).
We have a JMS Queue which is unloading a java.util.List object at a time. This List has 5 value objects.
In the session bean I iterate through this list and do the following :
while(importListPeople.hasNext()){
Person value = (Person)importListPeople.next();
//select statement to check if the Person already exists in DB
Person prsn =entityManager.query("SELECT from Person where...");
if(prsn !=null){ //do an update if person already exists
// update person record
// update PersonAV table
// do an insert into personIndexingQueue
// increment the person update counter.
}else{//do a create
entityManager.persist(value);
//insert into personAv table
//do an insert into personIndexingQueue
//increment the person create counter.
}
}
I get the below error when we are running the application
13:04:41,904 WARN [JDBCExceptionReporter] SQL Error: 1205, SQLState: 40001
13:04:41,904 ERROR [JDBCExceptionReporter] Transaction (Process ID 63) was deadlocked on {lock} resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
For log ,sqlprofiler I could narrow down that the deadlock is occurring on the below select statement in the code.
//select statement to check if the Person already exists in DB
Person prsn =entityManager.query("SELECT from Person where...");
This code works if there is only one object in the list.
The above code works on mysql with 20 objects in the list.
Please help.
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Jun 4, 2015
How we can avoid blocking and deadlock?
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Jul 20, 2005
hi can anyone tell me if the order of the update staments on multipletables can have an effect on deadlocks on a transactions.for examples if i have adog -> dogid colorid breedid namecolor-> colorid colorbreed-> breedid breedwould it make any difference if i update the breed table beforeupdating the dog table?thanks
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Dec 29, 2005
I sometimes get the following error from an update statement in astored procedure:Transaction (Process ID 62) was deadlocked on thread | communicationbuffer resources with another process and has been chosen as thedeadlock victim. Rerun the transaction.The isolation level is READ UNCOMMITTED and there are no explicittransactions in the stored procedure. The update statement is asfollows:UPDATE PLSET PL.PL_SI_LAST_YEAR_AMOUNT = #tmpWorkPLPrior.PRIOR_AMOUNTFROM #tmpWorkPLPriorWHERE PL.COMPANY = @compAND PL.PLAN_YEAR = @yearAND PL.FORECAST_QUARTER = @qtrAND PL.VERSION_ID = @verAND PL.BUSINESS_UNIT_CODE = #tmpWorkPLPrior.BUSINESS_UNITAND PL.PROJECT_ID = #tmpWorkPLPrior.PROJECT_IDAND PL.BUDGET_CODE = #tmpWorkPLPrior.BUDGET_CODEAND PL.BUSINESS_UNIT_CODE <> 'G7'PL rows: 24,342,553PL rows - Filtered: 230,088#tmpWorkPLPrior rows: 3,641Updated rows: 43,692The temp table (#tmpWorkPLPrior) is created by a SELECT INTO statement.It has the values that need to be set in the PL table. The PL tablehas a clustered index on 8 columns. The filters (@comp, @year, ...)select 230,088 rows. When the update succeeds it updates 43,692 rowsin about 15 seconds. Why does this sometimes deadlock and other timessucceed? There is nothing else running, so the process is deadlockingon itself.Thanks,Frank
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May 30, 2006
We are running a shopping mall in Korea and got a database including a table
of 4 million product prices, which is to be updated hourly basis. Updating 4million
records requires at least 10 minutes to complete. During the update, our shopping mall
exposed to customers does not respond quickly in fact very very slowly
and we investigated and found out that many tables of SQL database during the update were being
locked. As you know, site speed is top priority. We studied and found out that there are
two ways to avoid having locked tables during update, those are "read uncommitted" and
"snapshot" using the following lines.
set transaction Isolation level read uncommitted
set transaction Isolation level snapshot
We tried numerous times the above two lines and still find our tables being locked during update
and our customers are being disappointed.
My questions:
1. Is it possible at all in view of "the state of the art" to avoid having locked tables during update of 4 million records ?
2. if it is possible, would you please teach me like I am the beginner of database studies?
For your information, we are using 2005sql (64bit) in Windows 2003 (64bit).
Sincerely
Daeyeon Jo
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Apr 26, 2004
How to update a column in the table using the data from another column in the same table? Thanks.
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Nov 10, 2015
Is there a way to send out an email woth deadlock information (victim query, winner query, process id's and resources on which the deadlock occurred) as soon as a deadlock occurs in a database or at instance level?I currently has trace flag 1222 turned on. And also created an alert that send me an email whenever a deadlock occurs. but it just says that a deadlock occurred and I log into sql server error log and review the information.
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Jan 10, 2007
Hi guys! Is there a way to combine these update statements?
Dim update_phase As New SqlCommand("INSERT INTO TE_shounin_zangyou (syain_No,date_kyou,time_kyou) SELECT syain_No,date_kyou,time_kyou FROM TE_zangyou WHERE [syain_No] = @syain_No", cnn)
Dim update_phase2 As New SqlCommand(" UPDATE TE_shounin_zangyou SET " & " phase=2, phase_states2=06,syounin2_sysd=CONVERT(VARCHAR(10),GETDATE(),101) WHERE [syain_No] = @syain_No", cnn)
The same table is updated so I think it would be better to have just one update statement. But the problem is that, the first update statement retrieves values from another table, whereas the update values of the second statement is fixed. Is there a way to combine these two statements. I tried to do so but it does not update. Here's my code...
Dim update_phase As New SqlCommand("UPDATE TE_shounin_zangyou SET TE_shounin_zangyou.syain_No=TE_zangyou.syain_No, TE_shounin_zangyou.date_kyou=TE_zangyou.date_kyou, TE_shounin_zangyou.time_kyou=TE_zangyou.time_kyou FROM TE_zangyou WHERE TE_zangyou.syain_No = TE_shounin_zangyou.syain_No", cnn)
Please help me. Thanks.
Audrey
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Mar 13, 2008
hello gang, Is it possible to combine sql update statements? something like:
UPDATE table_nameSET column_name = new_valueWHERE column_name = some_valueANDSET column_name = new_valueWHERE column_name = some_other_value
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May 14, 2002
Hello,
I am creating my companys' database and I have a small problem that must be
solved.
I have a pictures table:
PicturesTable
-------------
ProductID int ForeignKey
Picture nvarchar(30)
...
(A product can have many pictures & the ProductID is unique for any product,
but not for the table of pictures).
What I want to do is to somehow do a procedure to:
1) Check if any images (for a productID) exists in the table
2) if they do not exist then add the appropriate images into the table
3) if the images exist, then update the images with the new one that I have.
What I thought was to just delete all the images from the table for the
specific product:
DELETE FROM PicturesTable
WHERE ProductID = '10-11'
and then add the appropriate images:
INSERT INTO PicturesTable (ProductID, Picture)
VALUES ('10-11', 'Dir1/Pic1.gif')
INSERT INTO PicturesTable (ProductID, Picture)
VALUES ('10-11', 'Dir1/Pic2.gif')
INSERT INTO PicturesTable (ProductID, Picture)
VALUES ('10-11', 'Dir1/Pic3.gif')
but I do not like a lot this idea because if a user tries to read the pictures
for that product (at the same time I was deleting them) s/he would get
nothing. Is any other way that I can do it please?
I would appreciate it if someone answers me.
Yours, sincerely
Efthymios Kalyviotis
ekalyviotis@comerclub.gr
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Mar 29, 2004
My manager is interested in knowing if there is a way to update our website's SQL database using a method with excel, similar to importing.
The person who was previously in my position had imported a few hundred new products into the database with an excel spreadsheet.
Now, we would like to make updates such as a price changes or similar adjustments to a number of the products in the database. We could use a web interface, but ours requires us to find each product individually and it takes too much time. I told him that it would probably be necessary to write an SQL statement to update the tables, but we're also interested in maintaining the integrity of the database and are worried about loosing data due to a typo. Is it possible to export the db contents to an excel file, make changes, and then merge those changes into the existing database? I have tried and failed, so I am wondering if any experienced users could help me out.
Also, is there some kind of phpmyadmin for MS SQL? A free, open source alternative would be best.
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Jun 5, 2007
Hi,
I have this update statement that works, it updates the totalamount to calc amount, but I want to update totalamount only when it is not equal to calcamt.I have tried many things but in vain.Can some one please help me.
How do i use case statements to update only when totalamount!=calcamt.
update c
set totalamount= calcamt
from Prepay c
JOIN
(select sum(amt) as calcamt, payid
from pay
group by payid
)b ON b.payid= c.payid
where c.cust_no='somenum'
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Sep 19, 2006
HI Gurus
I have written one CTE (common table expression) and trying to use same CTE with three seperate UPDATE statements which gives me error saying "Invalid Object name" (it works fine when I try to use with 1 update statement (any one from three update statements)
Isnt it possible that I can use 1 CTE with mutiple update statements?
waiting for your reply....
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Oct 31, 2007
What is the single SQL statement to truncate the blank space on either side of data.
Ex.
Table1 has Name as column.
I have records filled with blank space on both side for Name field.
With one query I want to correct (truncate the leading and trailing space) the data.
How?
SQL Server 2005 SP2.
Thank you,
Smith
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Jun 5, 2007
Hi,
I have this update statement that works, it updates the totalamount to calc amount, but I want to update totalamount only when it is not equal to calcamt.I have tried many things but in vain.Can some one please help me.
How do i use case statements to update only when totalamount!=calcamt.
update c
set totalamount= calcamt
from Prepay c
JOIN
( select sum(amt) as calcamt, payid
from pay
group by payid
)b ON b.payid= c.payid
where c.cust_no='somenum'
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Nov 2, 2004
I am almost sure I can update variables columns in one select/case type
statement, but having problems working out the syntax.
I have a table with transactions - with tran types as the key.
in this example, types = A,B,C ,D.
in this first example I am updating the sum of QTY to value t_A based on
tran types =A.
can I perform sub query/case to update with the same where clause
but for types B,C and D?? I also have to insert for specific lot numbers each sum values.
Create table #t_reconcile(
t_lot_number int not null,
t_A float,
t_B float,
t_C float,
t_D float)
insert #t_reconcile
select t.lot_number, sum(t.qty)
from i , t
where i._id = t.event_id
i.transaction_type = 'A'
group by t.lot_number
order by t.lot_number
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Mar 18, 2008
I'm working on a query which involves changing the case of a field from mixed case to all lower case. The field exists in multiple tables, so to do this I have multiple update statements. Is there a way to make this more efficient?
See below for example:
update InvestBroker
set BrokerID = lower(BrokerID)
update InvestFill
set BrokerID = lower(BrokerID)
update InvestBrokerAccount
set BrokerID = lower(BrokerID)
update InvestFIXBroker
set BrokerID = lower(BrokerID)
update InvestUploadBrokerFilter
set BrokerID = lower(BrokerID)
update InvestSettleInstructions
set BrokerID = lower(BrokerID)
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Jun 22, 2015
I get the error:
(0 row(s) affected)
Msg 208, Level 16, State 1, Line 41
Invalid object name 'X_SET_PREOP'.
FOR THE FOLLOWING CODE SEGMENT.. I am trying to do 2 updates with just one WITH BLOCk.Create table #temp( MPOG_CASE_ID uniqueidentifier, lab_name varchar(100), lab_date datetime, lab_value decimal(19,2) );
with X_SET_PREOP as
(
SELECT
xx= ROW_NUMBER() OVER ( PARTITION BY lab.MPOG_Case_ID, lab.lab_name ORDER BY lab.lab_date DESC ),
lab.MPOG_Case_ID,
lab.lab_name,
lab.lab_value,lab.lab_date
FROM
MPOG_Research..ACRC_427_lab_data lab
[code]....
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Jul 20, 2005
HiI'm using the SQL 2000 table variable to hold 2 different fact sets.I'm declaring the variable @CurrentTable and inserting into it using aSELECT statement with no problems.I'm leaving certain of the columns null in order to later update themwith the PK.Problem is in the UPDATE syntax I'm usingUPDATE @CurrentTableSET ManagerTitle = (select mgrs.pos_title from mgrs) wheremgrs.pos_num = @CurrentTable.MgrPosNumIt is insisting I declare the @CurrentTable variable when I try to useit in the where clause.Is it simply out-of-scope or am I really doing something foolish?Andrew
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Jul 20, 2005
Hi,I am using MS SQL Server 7.0 SP2 in Windows 2000 server SP4.I have one-to-many tables (TABLE_HEAD and TABLE_DETAILS)which I amgoing to update by using a stored procedure with UPDATE statements.But somehow ,ONCE IN A WHILE, when executing the stored procedurewith about 1000 rows updated, I lost 10-20 records from TABLE_HEAD(seems like 10-20 records were deleted) , and all data rows inTABLE_DETAILS were updated correctly (even details of lost rows ofTABLE_HEAD).In update procedure, I update both part of primary key and othercolumns with having WHERE condition.Please help , I really don't know why this happens.Thanks in advanceNipon Wongtrakul
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Apr 8, 2008
Our existing DW's ETL was written in a very complex fashion by the previous team. They use DTS package lookups to read a row in the Source SQL Server database see if that row exists in the taget SQL Server database. If the row does not exist, they use ActiveX scripts to INSERT the row in the target SQL Server database. If it exists, they update the row on the target side. How would you do this in SSIS? Apologize if this sounds like a basic question, however, I would have done this via Stored Procedures or SQL Scripts especially since it involves SQL Servers alone. Appreciate any help.
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Jan 31, 2008
I have a SP that has the correct syntax. However when I run my web-app it gives me this error: "Only one expression can be specified in the select list when the subquery is not introduced with EXISTS. "
The procedure takes in three parameters and retrieves 23 values from the DB to display on my form.
Any ideas?
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Mar 28, 2006
I have been posting to the Data Presentation Controls forum for about a month regarding a problem I've been dealing with.
http://forums.asp.net/thread/1223055.aspx
What it boils down to is that on a button click event, I was updating
some records, then re-executing a SELECT statement to get the records
back out and rebind my DataGrids. This was happening too quickly
and the data was not being updated in time before the SELECT was
executed. So my grids would still display "old" data.
How do I get SQL Server to commit the UPDATE before my C# code continues?
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Feb 23, 2007
Hi all,
Does an UPDATE statment lock the entire table or just the rows that will be affected by the UPDATE?
I ask because -
Can I run UPDATE statements in parallel on the same table on the same column. The need for doing this is because the table is a large fact table. I plan to execute the same UPDATE statements on different time sections of the data to expedite the processing.
If the UPDATE statment lock the entire table then I cannot run an UPDATE in parallel. If the UPDATE statement just locks the rows that will be affected then maybe I can because rows affected will be different for each UPDATE.
Let me know.
Thanks,
Vivek
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Mar 11, 2004
When working from within VB, should i be using Insert or Update statements, or should i pass the values to a stored proc that does it for me.
thanks
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Nov 6, 2007
Hi , I am trying to update a main table from its staging table based on certain criteria
like if the checksum doesnot match for the same Business/primary key update that row in the main table .
problem what i am facing is if there are two rows in the staging table with different checksum values the main table's corresponding row gets updated with only the first row from the staging table and ignores the second row in staging , i want the update to be capturing each row. is there a way to do this task repitively in ssis.
iam using execute sql task in ssis
first step to delete all matching checksum records in staging
next update non matching checksum into main table.
i want to repeat these two steps based until condition that count of rows in staging is equal to zero .
is there a way to acheive this please let me know.
for example
staging main table
name age checksum name age checksum
xyz 26 456 xyz 24 876
xyz 28 234
my result should have in main table
xyz 28 234
but instead i am getting xyz 26 456
i want the update statement row by row not set based . please help me with this
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Apr 21, 2007
Hi, I just want you to know that I am very young in ASP.NET world so please bear with me.I have been looking for an answer to my problem, but unfortunately I couldn’t find one. So I created a user here on www.asp.net just for making this post.
Before I continue I just want to apologies if there is another post where this question is already answered.
Please watch this Print Screen I just took: � http://www.bewarmaronsi.com/Capture.JPG “
As you can see the “INSERT, UPDATE, and DELETE Statements� are disabled, and that’s exactly my problem. I tried with an MS access database and it works perfect, but when I use a MS SQL database this field gets disabled for some reason.
The MDF file is located in the App_data folder and is called ASPNETDB.
And when I try to add custom SQL statements, it gives me Syntax error near “=�. Something like that. I bought the Total Training Set1 package and it works perfect in their examples.
I just want to thank you for reading my post and I hope that you got some useful information for me.
By the way, I’, from Sweden so you have to excuse me if my English is rusty.
Thanks!
PS: Can it be that I’m running windows Vista?
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Mar 26, 2008
I have problem in using the SQLDataSource. When in VS 2005 I drag and drop the SQLDataSource onto my page and then add a GridView control.I bind the GridView control to the SQLDataSource control. But the problem is it does not generate the INSERT, UPDATE, and DELETE statements. The dialog box is inactive. The screenshots may help. please help me in this regard. I also tried it for Accesscontrol but the same problem. Sorry for my poor English!. thanks in advance
the screenshot links:
http://img139.imagevenue.com/img.php?image=28285_2_122_937lo.JPGhttp://img205.imagevenue.com/img.php?image=27550_1_122_203lo.JPG
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Oct 25, 2004
Auditors want us to track when Insert, Update and Delete failures occur. Is this possible in SQL 2000?
They also want us to track schema changes. Is this possible?
Thanks, Dave
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May 4, 2015
I have a main table called Stock for example.
One process ( a service ) inserts data into this table , as well as updates certain fields of the table periodically.
Another process ( SQL Job ) updates the table with certain defaults and rules that are unknown to the service - to deal with some calculations and removal of null values where we can estimate the values etc.
These 2 processes have started to deadlock each other horribly.
The SQL Job calls one stored procedure that has around 10 statements in it. This stored proc runs every minute. Most of them are of the form below - the idea being that once this has corrected the data - the update will not affect these rows again. I guess there are read locks on the selecting part of this query - but usually it updates 0 rows - so I am wondering if there are still locks taken ?
UPDATE s
SET equivQty = Qty * ISNULL(p.Factor,4.5) / 4.5
FROM Stock s
LEFT OUTER JOIN Pack p
on s.Product = p.ProductId
AND s.Pack = p.PackId
WHERE ISNULL(equivQty,0) <> Qty * ISNULL(p.Factor,4.5) / 4.5
The deadlocks are always between these statements from the stored procedure - and the service updating rows. I can't really see how the deadlocks occur but they do.
Another suggestion has been to try and use an exists before the update as below
IF EXISTS( SELECT based on above criteria )
( UPDATE as before )
Does this reduce the locking at all ? I don't know how to test the theory - i added this code to some of the statements, and it didn't seem to make much difference ?
Is there a way to make a process ( in my case the stored procedure ) - give up if it can't aquire the locks rather than being deadlocked - which leads to job failures and emails etc ?
We are currently trying to filter down the data that is updated to be only the last few months - to reduce the amount of rows even analyzed - as the deadlocking does seem to be impacted by the number of rows in the tables.
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Jul 20, 2006
Hi,I'm new to ASP.NET and having a problem configuring the SqlDataSource control. I am using the standard ASP.NET 2.0 "aspnetdb" database to manage user accounts. The problem is this:When using the wizard to configure my SqlDataSource control, the option to auto-generate the Insert/Update/Delete SQL statements are grayed out. I've searched this forum and found that this can be a symptom of no primary keys in the tables. However, there are primary keys (UserId), which is the default schema as generated by asp.net (aspnet_regsql.exe). When I use the wizard, I make the following choices:How would you like to retrieve data from your database?-> Select "Specify columns from a table or view"-> Select the "vw_aspnet_MembershipUsers" view from the "Name:" drop-down list-> Select "UserId", "Email", "UserName" from "Columns:"After this, still no option to auto-generate I/U/D statements. Any thoughts on why this isn't working??? Thanks,Leah.
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