How To Avoid Having Locked Tables During Update In Sql Server 2005?
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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Oct 20, 2014
We have a project developed on asp.net 3.5 with SQL Server 2008 R2 as back end database. One of our client is facing issue of system performance in the afternoon time only. Mostly the tables are getting locked for unlimited time and system gets very slow. Need a professional SQL Server DBA to identify the root cause.
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May 20, 2008
I want to change the (dateformat) columns in (syslanguages) tables from dmy to mdy in SQL Server 2005,
but the update query did not success, and error message (Ad hoc updates to system catalogs are not allowed) .
Although I used
sp_configure 'allow updates',1
RECONFIGURE WITH OVERRIDE
before executing the update statement.
Can any body help me.
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Nov 29, 2006
Greetings,
I receive an error message in event log when i try to connect to the Database Server using ODBC on a client machine. The database server is running on Windows 2003 Server Standard Edition and the client machine is Windows XP Professional. Following is the error message from the event log:
2147467259 - [Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user 'sa' because the account is currently locked out. The system administrator can unlock it.
What causes the error to occur and how to resolve it?Appreciate for your assistence.
Thanks and regards,
Viknes
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Feb 23, 2001
I am having an interesting problem that has got me completely baffled. I restored a database from the .bak file of another database on my server to use as a test DB for an App. upgrade before upgrading the live side. The problem I have run into is that the application will not allow login into the DB unless the Trusted Connection user has dbo privs. The DB is not set for dbo use only acoording to sp_dboption. It is not this way on the live side and tech support for the app. and I both think it has to strictly do with something in the SQL permissions. Any Ideas on what could have happened? Is the restored DB hanging onto something from the original DB that could be causing this? The connection works great on the live side on the older version, and I have seen it work in the newer version as well. Any takers?--Dallas
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Jul 23, 2005
HelloI have a stand alone Java application that uses SQL Server 2000 on thesame machine. Sometimes, when we run the applications and follow acertain steps, the SQL server locks some of the table. At that point oftime, if we try to query Select * on those table, in Query Analyzer, itjust keep spinning and doesn't return anything. That tells me that thetables are locked. If I close the application then it frees up theconnection and those tables are accessible again.My question is how do I find out how and what query/update causes thetables to be locked. Is there a tool (some kind of a profiler) that cantell me what was the last insert/update/delete quesry was run before itgot locked?Please help me.
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Dec 16, 2007
Hi all,
I have 10 tables with unique values such as mobile no: and message in each table.But now the problem is that this same mobile no: may be there in other tables.How can i eliminate the records from other tables.Can anyone tel me a suggestion.
Thank U.
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Sep 14, 2006
I need help on two questions:1. Is temp table the only way to pass recordsets from a nested storedprocedure to a calling stored procedure? Can we avoid temp tables inthis case?2. Are operations in a stored procedure are treated as a transaction?Any help will be greatly appreciated.Background: We need to use temp table to pass recordsets from a nestedstored procedure to a calling stored procedure. Our understanding isthat in this case, we have no choice but to use temp tables. So, weneed to optimize the performance as much as possible. To do this, wewanted to find out whether operations in a stored procedure are treatedas a transaction. We are using SQL 2000 SP4. I could not find anyanswers so I did the following experiment.Experiment 1:SET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS OFFGOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[Wiz_SP_Transaction_Test]') and OBJECTPROPERTY(id,N'IsProcedure') = 1)drop procedure [dbo].[Wiz_SP_Transaction_Test]GOCREATE PROCEDURE [dbo].[Wiz_SP_Transaction_Test]ASUpdateArticlesSETIsUpdate = 20whereArticlesId < 80000SELECT * from ArticlesGOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGO"SELECT * from Articles" takes a long time (about 40 seconds) tocompleteBefore executing the SP, the IsUpdate attribute for all articles is 30.Then I executed this SP. Before the SP is finished, I end the SPmanually. I checked the IsUpdate attribute again, and found that allArticles's (ArticlesId < 80000) Isupdate attribute is now 20. Theoperations did not rollback. I interpret this to mean that the whole SPis not treated as a transaction.Then, I did experiment 2 below. This time, I explicitly declared thetransaction.SET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS OFFGOif exists (select * from dbo.sysobjects where id =object_id(N'[dbo].[Wiz_SP_Transaction_Test]') and OBJECTPROPERTY(id,N'IsProcedure') = 1)drop procedure [dbo].[Wiz_SP_Transaction_Test]GOCREATE PROCEDURE [dbo].[Wiz_SP_Transaction_Test]ASBEGIN TRANSACTIONUpdateArticlesSETIsUpdate = 50whereArticlesId < 80000SELECT * from ArticlesIF @@ERROR <0 ROLLBACK TRANSACTIONCOMMIT TRANSACTIONGOSET QUOTED_IDENTIFIER OFFGOSET ANSI_NULLS ONGOBefore this second SP, the IsUpdate attribute is 20 (set in the firstexperiment). I run this second SP and ended it manually before itfinished. I checked the IsUpdate attributes for all Articles's(ArticlesId < 80000), but their Isupdate attribute is 50. So theoperation did not rollback either. But we have declared the transactionexplicitly. Does this mean that the SP is still not treated as atransaction?
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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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Feb 5, 2008
I have a table T1 with columns: Date, Salesman, Sales. Salesman is a userid for each person and Sales is a decimal capturing sales done on Date.
From the data in T1 I would like to have a table with the following:
Salesman Sales-To-Date Sales-Last-Week
I have been able to do it with a temporary table, temp, as follows:
select Salesman, Sum(Sales) as ToDate into temp from T1 group by Salesman
with T2 as (
select Salesman, Lastweek=sum(Sales) from T1 where week>='1/28/2008' and week<='2/3/2008' group by Salesman
) select temp.Salesman, ToDate, Lastweek from temp full join T2 on temp.Salesman=T2.Salesman
How can I do the above in one query statement?
Thanks
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Jun 3, 2008
Hi all,
Below are my tables:
Rowid
Name
1
John
2
Peter
3
Jack Table
Rowid
Rowid1
1
1
1
2
1
3
2
1
2
2
3
2
3
3 Table1
Rowid1
Country
1
USA
2
UK
3
JAPAN Table2
I tried to get the Country for all the people in the first table.
My SQL statement is: SELECT Table.Name, Table2.Country FROM Table Left Join Table1 ON Table.Rowid = Table1.Rowid Left Join Table2 ON Table1.Rowid1 = Table2.Rowid1
My final result is shown on Table2. But is it possible if I can generate the results without the duplicate Names (as shown below)?
Name
Country
John
USA
UK
JAPAN
Peter
USA
UK
Jack
UK
JAPAN
Any advice will much appreciated.
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Jun 10, 2014
I created a Fact Table with 3 Keys from dimension tables, like Customer Key, property key and territory key. Since I can ONLY have one Identity key on a table, what do I need to do to avoid populating NULLs on these columns..
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Aug 27, 2007
My sql server just dissalowed every connection attempt made. All the allowed users were denied permission, including the computer's admins. I changed the permissions and tryed everything I could think of but it wont let me back in. Can someone help ASAP?
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Oct 26, 2006
Greetings,
I have two tables:
CustomerOrder
----
ID
CustomerID
StatusID
CustomerOrderDetail
----
ID
Order_ID
StockID
Quantity
CustomerOrderDetail table has clustered unique index for ID and non-clustered for Order_ID
SQL Server 2005 is using table scan for CustomerOrderDetail table When I user the following query:
select
cod.*
from CustomerOrder co
inner join CustomerOrderDetail cod ON cod.Order_ID = co.ID
where
co.StatusID = 8 -- Pending
Both of the tables are pretty big, detail table has more than million records, so scanning the table is a bad idea.
When I specify hint to use index then sql seeks, but how do I make SQL server to use index automatically? I don't want to use hints in my queries.
Thanks!
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Oct 22, 2004
I'm changing data storage for an asp.net project from MS Access to Sql Server. I've got the web site working, but I need to update the sql server tables with data from our Oracle db daily. What is the "best" way to do that?
I've read about DTS, but have never done anything like that. Would it be worth the time and effort to study? (So far I've created a package, with the import wizard, that doesn't work & I don't have the authority to delete :-)
I know I could create a dataset with my Oracle data and use that to update sql server. But is there a way to schedule an aspx to run authomatically? Would this affect performance? The sql server db isn't very big (30-40,000 records), but the Oracle db is & I need to do quite a bit of manipulation to the data.
This is new to me & I'm don't know what I should be searching for to find help. And if there is a more appropriate place to post this question, please let me know.
Thanks.
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Nov 2, 2006
Hi everyone, I hope someone can help me here! A friend of mine set up a Windows 2003 Server for me in my home with Sql Server 2005. I'm developing a website for prospective employers to see the kinds of things I can program since I have no field-related work experience. I have a cool site up, but I can't showcase the any features that use sql server (which obviously, are the kinds of things employers want to see) because the login and password my friend remembers produces this error:Cannot connect to server. Additional information:An error has occurred while establishing a connection to the server. When connecting to sql server 2005, this failure may be caused by the fact that under the default settings sql server doesn't allow remote connections,(provider: Named Pipes Provider, error: 40-could not open a connection to sql server)(Microsoft sql server, Error:2)My friend doesn't know how to fix this. Is there a way to create another login with admin rights in the command prompt so that I can login & get my database functionality going? Thanks in advance,Monster
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Jun 19, 2007
Am I imagining it or did I read somewhere once about an tool/command/method that allows the administrator/dba to access the server even if no-one else can - probably only in certain scenarios.
I think it had a use for a situation where all the connections are used up and no further connection pooling can kick in for a while. This tool enabled the dba to still get to the server and I presume still be able to run stuff like sp_who and kill.
Does this ring a bell with anyone?
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Mar 19, 2015
I have a query, I am trying to update a certain column in my query you can see that is hard coded. The column that I am trying to update is "O_Test" I used a select statement trying to figure out how many records that accounts for with the entire database of all the tables. I got 643 records. So I am wondering if there is a way I can update all the columns without looking up each table and updating each one. This Update statement wont work because I am accounting for all records in the DB of all tables associated of what I hard coded
SELECT t.name AS table_name,
SCHEMA_NAME(schema_id) AS schema_name,
c.name AS column_name
FROM sys.tables AS t
INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID
WHERE c.name LIKE '%O_Test%'
ORDER BY schema_name, table_name;
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Mar 26, 2008
HI, My computer keeps trying to download SQL Server 2005 Express Edition SP2 and fails with the error code 0x2B22. It is a new computer running with Windows XP Pro.
I have spent hours searching the forums and the internet, but I can't find anything to help, or I don't understand the solutions or whether they relate to my computer. I don't know how to find out why the update is failing either.
Please can someone help!!
Thank you!
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Jul 23, 2005
Hi-I've been trying to install SS2K Hot Fix # 818095 for one of my clientsand it keeps terminating - the Log for the install contains an errormessage that reads "...dbmslpcn.dll is WRITE LOCKED".I stopped all but a few of the services on the box, but still can'tseem to get it installed.Any suggesions??Thanks in advance for any help on this issue, it's been a royal PITA!Pete
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Apr 22, 2015
I have got 4 MS Access Database Files, which have got 3 Tables each, means Total 12 Tables which gets updated with new data every evening, by an external application. Means new data gets appended to all these 12 Tables.
I want to have exact same 4 Databases, which have got 3 Tables each, means Total 12 Tables, but WITHIN MS SQL SERVER. And then update all of these 12 Tables every evening, with the corresponding updates from the respective tables from the MS Access Databases.
I do not want to Manually Update all these 12 tables every evening into SQL Server. Hopefully there would be some easier method to do this in automatic manner.
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Jan 9, 2011
Just wondering if there is any query which can give me report of locked account in SQL 2008. I know there are options like:-
1) Can go in ssms--security--account and right click and select status. This is applicable to individual account.
2)SELECT LOGINPROPERTY('accountid', 'IsLocked'). Also applicable to individual account
3) SELECT name,type_desc,is_disabled,modify_date,default_database_name from sys.server_principals order by type_desc
Generate the report but give the informatio as is_disabled. But I think is_disabled <> is_locked.
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Dec 23, 2014
I'm working on databases where statistics of some indexes (tables) are changing too frequently. Once I update them manually, one minute after they get 10-20% change, and five minutes after they get over 100% change. Tables get updated very frequently (multiple times in a second).
When I run a query to read from sys.stats, sys.dm_db_stats_properties and other dynamic views, I see that they were last updated when I did it manually, but the change rate overpassed the 500+20% (tables have multiples of 10K rows). Auto create and update statistics are set to true on all databases, and I don't know why sql server does not do that automatically.
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Aug 31, 2015
I am trying to run an update statement against a vendor's database that houses HR information. If I run a regular select statement against the database with the following query, it returns without error:
SELECT "QUDDAT_DATA"."QUDDAT-INT", "NAME"."INTERNET-ADDRESS", "QUDDAT_DATA"."QUDFLD-FIELD-ID", "QUDDAT_DATA"."QUDTBL-TABLE-ID"
FROM "SKYWARD"."PUB"."NAME" "NAME", "SKYWARD"."PUB"."QUDDAT-DATA" "QUDDAT_DATA"
WHERE ("NAME"."NAME-ID"="QUDDAT_DATA"."QUDDAT-SRC-ID") AND "QUDDAT_DATA"."QUDTBL-TABLE-ID"=0 AND "QUDDAT_DATA"."QUDFLD-FIELD-ID"=16 AND "QUDDAT_DATA"."QUDDAT-INT"=11237When I try to convert it into an
[Code] ....
I am assuming I am receiving this error because it doesn't know where to find QUDDAT-INT? How can I fix that?
The "QUDDAT-INT" column houses the employee number. So in the case of the SELECT query above, I am testing against a specific employee number.
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Nov 5, 2015
If I rebuild some indexes that are above 30% of average fragmentation, should I after that update statistics?
Also, How can I see if I Need to update statistics^on the tables of my database?
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Jan 3, 2005
hi!
I have a big problem. If anyone can help.
I want to retrieve the last update time of database. Whenever any update or delete or insert happend to my database i want to store and retrieve that time.
I know one way is that i have to make a table that will store the datetime field and system trigger / trigger that can update this field record whenever any update insert or deletion occur in database.
But i don't know exactly how to do the coding for this?
Is there any other way to do this?
can DBCC help to retrieve this info?
Please advise me how to do this.
Thanks in advance.
Vaibhav
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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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Dec 7, 2006
We have 20 -30 normalized tables in our dartabase . Also we have 4tables where we store the calculated data fron those normalised tables.The Reason we have these 4 denormalised tables is when we try to dothe calcultion on the fly, our site becomes very slow. So We haveprecalculated and stored it in 4 tables.The Process we use to do the precalcultion, will get do thecalculation and and store it in a temp table. It will compare the thetemp with denormalised tables and insert new rows , delte the old oneans update if any changes.This process take about 20 mins - 60mins. Ittakes long time because in this process we first do the calculationregardless of changes and then do a compare to see what are changed andremove if any rows are deleted, and insert new rowsand update thechanges.Now we like to capture the rows/columns changed in the normalisedtables and do only those chages to the denormalised table , which weare hoping will reduce the processing time by atleast 50%WE have upgraded to SQL SERVER 2005.So We like to use the newtechnology for this process.I have to design the a model to capture the changes and updated onlythose changes.I have the list of normalised tables and te columns which will affectthe end results.I thought of using Triggers or OUTPUT clause to capture the changes.Please help me with the any ideas how to design the new process
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Jan 24, 2008
I'm new to my company, although not new to SQL 2005 and I found something interesting. I don't have an ERD yet, and so I was asking a co-worker what table some data was in, they told me a table that is NOT in SQL Server 2005's list of tables, views or synonyms.
I thought that was strange, and so I searched over and over again and still I couldn't find it. Then I did a select statement the table that Access thinks exists and SQL Server does not show and to my shock, the select statement pulled in data!
So how did this happen? How can I find the object in SSMS folder listing of tables/views or whatever and what am I overlooking?
Thanks,
Keith
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Jan 28, 2007
I have a database in sql server 2000. In this i have used identity(seed,increment) property so that unique ids may be available. Now if requests from diffrent users arrives at same time on the server, will there be a conflict because of ids?
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Nov 13, 2007
I've recently bought a laptop with Windows XP Pro SP2. It keeps trying toinstall an MS update for SQL Server 2005 Express, but failing (with error0x2B22). What I'm wondering is, why is this there anyway? No SQL servicesare shown on the other two PCs in the house that run the same OS. Is itbecause the PC came with a trial version of MS Access, that I have nointention of trying out or activating? I have no need for databases onthe PC so far as I know. Can I just remove it? And if I remove it, howcomplex it is to re-install if necessary?Sorry for these basic questions. I would be grateful for links to web sitesthat have useful information. All the ones I can find assume I know allabout SQL servers already, which is the opposite of the truth!--Tony WMy e-mail address has no hyphen- but please don't use it, reply to the group.
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Apr 28, 2008
Hello,
I want to actualice my SQL Server and i´m asking if it´s posible to update all the hotfix trough the web update.microsoft.com, there is any automatic way in order to update SQL Server?
If there isn´t, What is the last hostfix?
Thanks
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Sep 25, 2007
Hi
I have a C# scheduled job trying to update a whole SQL table daily .
The way i can think of is drop the table everyday and create it again
I cant figure out how to use the update statement
Can some one help me with the update statement
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