Concurrent Queries Error
Jul 23, 2005
On my server running SQL Server 2000 (SP3). I frequently get this
informational message in the Event Viewer log.
17052 :
This SQL Server has been optimized for 8 concurrent queries. This limit has
been exceeded by 2 queries and performance may be adversely affected.
The application that I am running is a vendor application so I do not have
access to the code. I contacted the vendor, but they have never seen this
problem and cannot recreate it. I checked the Microsoft Knowledge Base for
help, but I came up empty. It seems like it should be a simple
configuration change.
Any advice?
Thanks,
Jeff
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Nov 9, 2006
If applicable, what's the limit on concurrent queries supported by SQL Server 2005 Express? Also, if there's a limit, does next connection after the max errors out or merely queues up?
Thanks,
Phillip
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Feb 6, 2006
I have a package that has several data flows that run concurrently after some initial tasks and an initial data flow. I want transactions on each of the data flows and have set the transaction option to Required on the data flows (not on the package itself). I am also using checkpoint restart on the package. A couple things are happening.
1) the first data flow is successful and that releases the several that are waiting. Some of these complete OK but inevitably one or two will fail. The failing data flows will be different from run to run, sometimes one and sometimes two will fail. The error says:
Error: 0xC0202009 at Provider_NF_Code, Delete Provider_NF_Code [130]: An OLE DB error has occurred. Error code: 0x80004005.
An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Distributed transaction completed. Either enlist this session in a new transaction or the NULL transaction.".
My hunch is that DTC is getting the transactions mixed up. I think it is committing one just after another data flow has already started work expecting the transaction to still be active. That would explain why the failing data flows are random. Plus, if I set the MaxConcurrentExecutables to 1 the entire package is successful. BUT, why have concurrent tasks if you can't run them concurrently.
2) when the package fails with the DTC problem I restart it with the checkpoint file. I was expecting the package to restart with the failed data flows. Instead, it restarts with the initial data flow (that all the other flows wait for in the package). This data flow has always been successful. It's as if the transactions I have put on the individual data flows are actually placed on a single virtual container that all of them are in, and when down stream data flows fail the entire data flow chain is rolled back and set to restart.
How can I get multiple concurrent data flows to run with transactions?
Why are successful data flows being restarted? Can I get just the failed tasks to restart?
-Gordy
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Jul 20, 2005
We are running three web sites in a clustered environmentWLBS. The web servers are connected to a Database Serverrunning MS SQL server enterprise edition licensed as perCPU license. The Windows 2000 Advanced Server Licensingmode on all the servers is per SEAT license.Our customers are accessing our web servers and after sometime getting error 500, Maximum concurrent users havereached.We have been told by our software provider that theconnection problem lies with the ADO components whichcommunicating with the SQL server.We have been turning round and round, without any luck.Your help will be highly appreciated.Thanks and best regardsDaveLearning is a Never Ending process*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Aug 30, 2006
I am getting the following error when with SQL Express.SQL Server blocked access to STATEMENT 'OpenRowset/OpenDatasource' of component 'Ad Hoc Distributed Queries' because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of 'Ad Hoc Distributed Queries' by using sp_configure. For more information about enabling 'Ad Hoc Distributed Queries', see "Surface Area Configuration" in SQL Server Books Online. While I was very please to see such a verbose error and directions on where to find the answer I have yet to figure out how to turn this option on... I tried sp_configure 'Ad Hoc Distributed Queries', 1 but got the following error The configuration option 'Ad Hoc Distributed Queries' does not exist, or it may be an advanced option.If I execute only sp_configure it does not list Ad Hoc Distributied Queries as an option. I checked the sql Books Online and it tells me to use the Surface configuration tool which SQL Express does not seem to have.... Could someone help me out with this?Thanks - Mark
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Jan 11, 2002
Hi, I have the following error logged in SQL Server's error log whenever I run a query on a particular database :
2002-01-04 22:54:02.46 spid11 Error: 823, Severity: 24, State: 1 2002-01-04 22:54:02.46 spid11 I/O error 1117(The request could not be performed because of an I/O device error.) detected during read of BUF pointer = 0x14eac480, page ptr = 0x73c94000, pageid = (0x1:0x158c89), dbid = 8, status = 0x801, file = d:mssql7datamydb.mdf..
2002-01-05 05:54:22.01 kernel SQL Server terminating because of system shutdown. 2002-01-05 05:54:22.14 kernel LogEvent: Failed to report the current event. Operating system error = 31(A device attached to the system is not functioning.).
and get this error in the Results pane of Query analyzer : Server: Msg 823, Level 24, State 1, Line 1 I/O error 1117(The request could not be performed because of an I/O device error.) detected during read of BUF pointer = 0x14ace4c0, page ptr = 0x35df6000, pageid = (0x1:0x44b73), dbid = 14, status = 0x801, file = d:MSSQL7DATAmydb.mdf.
Connection Broken
select @@version returns, Microsoft SQL Server 7.00 - 7.00.961 (Intel X86) Oct 24 2000 18:39:12 Copyright (c) 1988-1998 Microsoft Corporation Standard Edition on Windows NT 5.0 (Build 2195: Service Pack 2)
Books Online Help on Error 823 indicates that it is a disk problem and suggests that DBCC checkdb needs to be run on the database. But, hardware diagnostics on the server do not report any disk problems and dbcc checkdb also returns no errors.
Help on the cause of error 823 would be greatly appreciated. Thank you, Praveena
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May 8, 2001
I have a Stored Procedure I am trying to run that joins to a remote database. I am able to see everything in the QA just fine with this (courtesy of Anatha):
SELECT DISTINCT a.*
FROM LOCATION a,
LinkServer.MC_Card.webuser.LOCATION b
WHERE a.location_number = b.location_number
But I am trying to run this query in Stored Procedure(notice the 4-part name callout to the LinkedServer tables) which returns the error message:
Error 7405: Heterogeneous queries require ANSI_NULLS and ANSI_WARNINGS options to be set for the connection. This ensures consistent query semantics. Enable these options and then reissue your query.
Here is the Stored Procedure:
/****** Object: Stored Procedure dbo.spELRMCcardXtionByDate
Script Date: 4/24/2001 11:51:27 AM ******/
CREATE PROCEDURE dbo.spELRMCcardXtionByDate @dcid nvarchar(255), @startDate datetime, @endDate datetime
AS
-- declare @dcid nvarchar(255)
-- set @dcid = '1032'
SELECT STORE.[Str#], STORE.[Dcid#], E.card_number, E.program_number
, E.start_date, E.end_date, E.card_number, E.event_number
, E.status, E.budget, E.scheduled_date, P.tx_time, P.purchase_amount
, L.merchant_name
FROM (STORE INNER JOIN LinkServer.MC_Card.webuser.EVENT E ON STORE.[DemoID#] = E.event_number)
LEFT JOIN (LinkServer.MC_Card.webuser.LOCATION L RIGHT JOIN LinkServer.MC_Card.webuser.POS_TX P ON L.location_number = P.location_number)
ON E.event_number = P.event_number
WHERE (((STORE.[Dcid#])= @dcid)) AND E.scheduled_date BETWEEN @startDate AND @endDate
ORDER BY STORE.[Str#]
-- and E.card_number IS NOT NULL
GO
Any help greatly appreciated.
Thanks,
Bruce
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May 14, 2001
I am trying to create a stored procedure that updates a table on another server. It give the me the error about requiring ANSI_NULLS and WARNINGS being set. How can I set these if they are not already set? I tried setting them within the stored procedure, but does not appear to be working. Unless I am doing something wrong. I am trying to add SET ANSI_NULLS ON and doing the same thing for WARNINGS. Any thougts or suggestion on what to do? Thanks for the help
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Jul 20, 2005
Hi,I am running SQL Server 2000 SP3 on Windows Server 2003 and since recentlyhave a strange problem executing shape queries from COM+ components usingADO.Until 4 days ago, they worked, then from one moment to the next (I must havechanged something, but I have no clue what other than restoring a 1.2 GBdatabase) they started failing with this error:Microsoft OLE DB Provider for SQL Server error '80040e14'Syntax error or access violationI have no problem executing non-shape queries, it is just the shape queriesthat fail.Any clues what may have gone wrong? Or how I can fix it?Cheers,Rsa Myh
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Mar 16, 2004
Hey,
MSDE 2000 allows 25 concurrent connections.
If these are all used up, and a 26th connection comes in. What happens? is the connection rejected? or does it sit in a queue, waiting to be given a connection?
Thanks,
-Ashleigh
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May 8, 2002
hi
i hv developed an application that runs on the local windows system and interfaces with the MSSQL 7.0 database server using ODBC DSN Connections. This application will be deployed over the LAN with over 100 users.
The MSSQL 7.0 server has only 5 user licenses that limits the concurrent usage to 5 users.
I need a solution whereby all users can access the SQL server database without adding more licenses
Is there a way out.
Please help
Regards
JD
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Nov 30, 2007
Morning
I have been searching hi and low on the web to try and find out typically which version of sql server should be used based on the number of concurrent users you will be having.
I believe that Sql Server 2005 Express should only really be used for up to 10 concurrent users while I seem to remember that Standard edition supports up to approx. 33,000 connections.
Does anybody have this information to hand as I need to write a business case to justify the potential upgrade.
Many thanks
James
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Dec 16, 2005
Hi,Is it possible to have many different clients conncecting to a web basedserver all using, simultaneously, the same DSN-less connection string heldin a server side include file?Many thanksRay Allison
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Feb 29, 2008
what happens when a package is run concurrently by 2 or more users. will the flow be in a queue, if not how is it going to be.
Thanks .
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Aug 24, 2006
is it possible to limit the concurrent users in SQL connection string? Now, i m using .net 2003.regards,
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Nov 6, 2003
hey all,
MSDE will only allow 5 concurrent connections to ...
a particular database?
a particular instance?
or a particular server?
ie. if i have one application running on one instance of MSDE with 5 connections and i have another application running on another instance of MSDE with 5 connections. would i actually have 10 connections? **both instances on the same machine...
can someone please clarify.
TIA
Chris
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Nov 7, 2000
Hi,
Does anyone know is MS Access has any limited no of users, or how many concurrent users MS Access has?
Thanks
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Jul 20, 2000
I need to know how many concurrent users are allowed to access the database at any point of time.Will it depend on the type of licence?Where do we set this parameter.Some users are complaining 'time out' problem.Thanks for any help!
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Nov 29, 2007
dear folks,
Does anyone know how can I get concurrent user information on Microsoft SQL Server 2000/2005….?
Thanks
cheers
sbahri
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Mar 8, 2004
Hi all
I have a stored proc that runs every 4 hours - as a job. The stored proc takes about 3-5 minutes to comple, depending on number of records.
To do testing we run that stored proc manually, also.
Sometimes 2 or more people may run the same stored proc without knowing that the other person is running. This may create duplicates entries once processed.
What I want to know is, Is there a way to check if that stored procedure is currently running. If so it wont run second time concurrently.
(May be semapohres,mutex or something like that?)
(I am trying not to use a table to store whether the stored proc is running or not)
Thanks in advance.
Rochana
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Jul 20, 2005
I've been asked to turn our single-user database system into a multi-usersystem. At present, each user has a copy of the MSDE on their desktopmachine and uses our program to access it. In future, we would like tocentralise our MSDE instance and allow multiple users to access it. Inorder to facilitate this, we are going to only allow one user write accessto the system at a time (I know, its a kludge, but the system was neverdesigned for multiple users in the first place).I have a single, simple question this being the case: can I update a single"read-only" bit field in a table of the database in order to flag to otherusers that the system is in read-only mode in a way that avoids concurrencyissues? ie. does an "UPDATE" query lock and unlock? ( I suspect the answeris yes! ). If anyone else has experience of these things, I would alsoappreciate some tips on how best to proceed.ThanksRobin
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Jul 25, 2007
I'm new using SQL 2005 Express
I'm planning to use SQL Server Express 2005 for a asp net web application for a video rental store.
Is there a concurrent user conection limit that I should care?
TIA
Gerardo
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May 6, 2006
I have a puzzle in my mind here. I will thank anyone who can solve my puzzle.
I am not familiar with SQL and its theories behind, so please bear with me if I am asking a stupid newbie question.
My puzzle is generally a problem of generating sequence numbers. The following SQL is only a stripped down version - it fetches the max number, add 1 to it and updates the table with the new number.
DECLARE @max int
SELECT @max = MAX(next_number) + 1 from sequence_numbers
UPDATE sequence_numbers SET next_number = @max WHERE next_number = @max
Now if user1 gets 100 and user2 also gets 100 and they both try to update the table, what would happen? I fear that the result would be 101.
One of my coworker thinks that adding 'WHERE next_number = @max' can solve the conflict - user2 will fail. His reasoning is like this:
After user1 updates the table, next_number would be 101 and user2's update will fail because his WHERE criteria is still 100.
But I think user2 still sees the old data (100) and still succeeds and thus both users update the table with number 101.
Thanks.
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Apr 13, 2006
Hello,
There was a 5 concurrent user limitation in MSDE (the version prior to SQL Express). Does that same limitation exist with SQL Express 2005?
Thanks.
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Nov 8, 2007
Hi and thank you in advance to whomever takes the time to read this entry. I will be as detailed as possible, so I apologize for the length. The information here relates to the automotive industry, but I don't believe that is a very important detail
The overall purpose of this query is to create a compressed set of the data that exists in the database. The de-normalized information is structured like the following (including made-up data):
Code Block
PartNumber Make Model Year
-------------------------------------------------------
835100 ACURA INTEGRA 2004
835100 ACURA INTEGRA 2003
835100 ACURA INTEGRA 2001
835100 ACURA INTEGRA 2000
835100 FORD FOCUS 2002
There is any number of part numbers, makes, etc in this mix. The query that I currently use is utilizing MAX and MIN functions to determine year range, but as in the sample above, this does not take into account the fact that there could be a year skipped in the middle. I could probably use a cursor to do this, but would really like to stick to set logic if at all possible.
My existing query is:
Code Block
SELECT DISTINCT
cwi.PartNumber
,RTRIM(lv.Make) AS Make
,MIN(lv.Year) AS StartYear
,MAX(lv.Year) AS EndYear
FROM
CWIParts AS cwi
INNER JOIN PartTypes AS pt
ON cwi.PartTypeID = pt.PartTypeID
INNER JOIN PartDetail AS pd
ON cwi.PartNumber = pd.PartNumber
INNER JOIN Status AS s
ON pd.StatusCode = s.StatusCode
INNER JOIN LegacyVehicle AS lv
ON cwi.LegacyVehicleID = lv.LegacyVehicleID
WHERE
cwi.PartTypeID = 10
AND s.Status = 'Active'
GROUP BY
lv.Make
ORDER BY
cwi.PartNumber ASC
,cwi.Make ASC
In hopes to end up with a result set that has 1 row for each unique part-number, make, and consecutive year range relevant to the part-number and make. I will also need to add the functionality to add other attributes (such as Model and Liters), but those are equality based and can be passed in easily.
I had done most of this programatically in vb.net, but I would much rather push this logic back to SQL Server. Thank you all for any help that you can provide on this topic.
- Jay Soares
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May 18, 2008
Hi,
I read that there's a "tecnical" limit of 32767 concurrent connections for SQL 2005 Express, and that SQL 2005 Express uses only 1GB of memory. So, what's the number of practical concurrent connections SQL 2005 Express can handle? Is it 200 ,300, 0r 400...? How much memory is consumed by every connection?
Thanks in Advance.
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Jun 8, 2006
I have been trying to export an sql2000 database to sql2005 with no luck. I continuosly get the error
Msg 0, Level 11, State 0, Line 0
A severe error occurred on the current command. The results, if any, should be discarded.
I have looked upon all support material and have installed the latest sql2005 service pack, but this has not fixed the problem. a simple query as:
select * from [transaction] ta,transactionentry tr
where tr.transactionnumber=ta.transactionnumber and
glacctid=6 and ta.[time]> '3/01/2006'
would produce this fatal error.
the current version I am using is:
Microsoft SQL Server 2005 - 9.00.1399.06 (Intel X86) Oct 14 2005 00:33:37 Copyright (c) 1988-2005 Microsoft Corporation Standard Edition on Windows NT 5.2 (Build 3790: Service Pack 1)
This problem is happening on some of the most important tables in the database.
the error log contains the following:
2006-06-06 11:43:32.59 spid54 ***Stack Dump being sent to C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLLOGSQLDump0001.txt
2006-06-06 11:43:32.59 spid54 SqlDumpExceptionHandler: Process 54 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.
2006-06-06 11:43:32.59 spid54 * *******************************************************************************
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * BEGIN STACK DUMP:
2006-06-06 11:43:32.59 spid54 * 06/06/06 11:43:32 spid 54
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * Exception Address = 0136B4F0 Module(sqlservr+0036B4F0)
2006-06-06 11:43:32.59 spid54 * Exception Code = c0000005 EXCEPTION_ACCESS_VIOLATION
2006-06-06 11:43:32.59 spid54 * Access Violation occurred writing address FFFFFFFC
2006-06-06 11:43:32.59 spid54 * Input Buffer 260 bytes -
2006-06-06 11:43:32.59 spid54 * select * from [transaction] tr,transactionentry te where tr.
2006-06-06 11:43:32.59 spid54 * transactionnumber = te.transactionnumber and glacctid = 6
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * MODULE BASE END SIZE
2006-06-06 11:43:32.59 spid54 * sqlservr 01000000 02BA7FFF 01ba8000
2006-06-06 11:43:32.59 spid54 * ntdll 7C800000 7C8BFFFF 000c0000
2006-06-06 11:43:32.59 spid54 * kernel32 77E40000 77F41FFF 00102000
2006-06-06 11:43:32.59 spid54 * MSVCR80 78130000 781CAFFF 0009b000
2006-06-06 11:43:32.59 spid54 * msvcrt 77BA0000 77BF9FFF 0005a000
I have followed instructions on some support issues posted but none have helped. If anyone has any solution to this problem PLEASE HELP!!!!.
Thanks.
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Mar 12, 2008
I was wondering if it was possible to run 2 queries at the same time,IE rather than runningexec query1 exec query2 and having to wait for query1 to finish before query2 started, just have them run at the same time (they're not conflicting).I want to do this in TSQL, not by opening another query window in vs2005.
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Oct 22, 1999
Does anyone know how to change the number of conccurent connections on SQL Server 7. We have purchased 10 additional licenses and I need to change the concurrent users from 10 to 20. Any help would be appreciated. Thanks
Phil
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May 22, 2007
Dear All,
I have this .NET application that inserts lucky draw entries into SQL server. Each entry may have a range of values that the winning number will be drawn from. For example,
Entry 1: [1, 2]
Entry 2: [3, 8]
Entry 3: [9, 10]
Entry 4: [11, 11]
Entry 5: [12, 20]
The winning number will be picked from [1, 20]. Given this scenario, what is the best design that can handle the concurrency issue? If two entries are input at the same time, how to make sure it won't have the same starting value? Anyway to lock a table when one is accessing, disallowing other to run select query?
Thanks.
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Jul 23, 2005
Hi all !Does someone know how many concurrent connections 2005 Express canaccommodate ? The limit on MSDE was 5 before performance drops considerably.Thanks for your help.Sebastian
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May 24, 2006
Hi
I need some rough figures for replication performance. Can anyone give an idea of the number of concurrent subscribers a single IIS server can safely handle before having to move to load balancing with multiple IIS servers.
I would estimate the average daily row changes to be in the region of 500 to 2500 per subscriber.
Any ideas?
Many thanks
RL
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Jun 26, 2015
I have a table into which the inserts will be done by multiple users at the same time;
The table has a primary key, non clustered, on unique id; each insert will have unique id, which is a seqence generated number, so they are always different for different transactions.
Is this possible to set the settings of sql server in such a way, that these inserts are done at the same time i.e. during insert by one user that table is not locked so that other inserts can take place at the same time as well?
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