Error 500, Maximum Concurrent Users Have Reached
Jul 20, 2005
We are running three web sites in a clustered environment
WLBS. The web servers are connected to a Database Server
running MS SQL server enterprise edition licensed as per
CPU license. The Windows 2000 Advanced Server Licensing
mode on all the servers is per SEAT license.
Our customers are accessing our web servers and after some
time getting error 500, Maximum concurrent users have
reached.
We have been told by our software provider that the
connection problem lies with the ADO components which
communicating with the SQL server.
We have been turning round and round, without any luck.
Your help will be highly appreciated.
Thanks and best regards
Dave
Learning is a Never Ending process
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Mar 23, 2001
We have been running SQL Server 7 for the past 6 months, with no problems at all. All of a sudden, we have received the error message 17050, that the maximum limit for connections has been reached. We cannot now start Enterprise Manager or do anything. We have tried fiddling with licencing in control panel but to no avail. Does anyone have any idea why this has suddenly happened? Any tips would be great!
Cheers.
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May 28, 2007
I am trying to setup transactional replication between Server A and Server B. There are 265 databases on each server.
I am running SQL Server 2005 on Windows Server 2003. The problem comes in at the 201st database. The message in the SQL Server Agent Error Log is :
Warning,[398] The job (WSSWPG09-EmpirePaint-WSSWPG06-104) has been queued because the maximum number of working threads (400) are already running. This job will be executed as soon as one of the working thread finishes execution.
SQL Server's max worker threads is set to 0. The Distribution, LogReader and T-SQL subsystems have been increased to 200 max_worker_threads.
Is there some other setting (maybe a Windows Registry setting) that can be configured to fix this? Or have I just hit a physical maximum of the processor?
Any help is much appreciated.
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Jun 29, 2015
We have a big software that run a warehouse distribution center, written in .NET Backhand is a SQL Server 2008 R2 STD database.
Now, it seems there is a problem with the sessions not being properly closed after each call to the DB. Here is the message got form SQL:
DESCRIPTION:A new connection was rejected because the maximum number of connections on session ID 57 has been reached. Close an existing connection on this session and retry.
In the .NET code, connection is made with the following code:
If oConn Is Nothing Then oConn = New SqlConnection
If oConn.State = ConnectionState.Open Then oConn.Close()
With oConn
.ConnectionString = "Server=" & Server & ";Database=" & DB & ";User ID=" & User & ";Password=" & Pass & ";Connection Timeout=" & 5 & ";MultipleActiveResultSets=" & True
.Open()
End With
This code is called once, at the opening of the software
StoredProc are call with the code:
Try
oCmd = New SqlCommand
With oCmd
.Connection = oConn
.CommandType = CommandType.StoredProcedure
[Code] .....
So every Command is closed after execution, yet, they stay active in the SQL Server. Is there something I'm missing here?
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Oct 12, 2015
One of our production databases was setup mirroring, log shipping and replication on it, the log file was setup unrestricted growth. This morning one index rebuilding process generated lots of logs, and the log file disk ran out of space, the database was in recovery mode. so we had to disable log shipping, pause mirroring and replication, expand log file disk, restarted SQL instance to fix the issue. Now we want to setup the log file to maximum size 80G, the whole log file disk is 120G.
So if the log file reached 80G next time, we can change the max size to 90G or 100G and it's easier to fix the space issue. My question is, if the database log file reached max size,
1. is the database still available?
2. Will the active session causing the issue be rollback to release space back?
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Jul 23, 2005
I'll try and keep this brief so in a nutshell:I have large distributed java system running on a Windows 2003 server(4cpu 8Gb memory).Periodically the following exceptions occurs in the servers:java.net.SocketException: No buffer space available (maximumconnections reached?): recv failedI know for a fact we are not using too many TCPIP sockets or runningtoo many socket servers.I have googled this error and found very little to help me.What buffer space is this?What does recv failed mean?(Is it at all relevant that sql server is running on the same box?)Any advice appreciated.Thanks in advance.Dan
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Mar 4, 2015
I have a table called dbo.PhoneCalls with below columns
PhoneID |PhoneNumber| Callstarttime| CallEndtime|
1 |111-111-1111|2013-04-01 05:13:03.000|2013-04-01 05:13:03.000
1 |222-222-2222|2013-04-01 05:15:12.000|2013-04-01 05:16:52.000
2 |333-333-3333|2013-04-01 05:17:29.000|2013-04-01 05:24:08.000
2 |444-444-4444|2013-04-01 05:21:50.000|2013-04-01 05:22:31.000
2 |555-555-5555|2013-04-01 05:22:41.000|2013-04-01 05:23:11.000
2 |666-666-6666|2013-04-01 05:23:20.000|2013-04-01 05:23:46.000
..........
1. PhoneID is nothing but the participant in the call. PhoneID = 1 is twice from above. Which means 2 particpants (Same call )with 2 numbers with their callstarttime and callendtime. Similarly for PhoneID =2, there are 4 participants. And the list goes on for a day and then for a month.
2. For example a phone call P1 with 2 participants is going on for a particular day. We should not consider the same phone call having 2 participants involved. So that the concurrency would be 2. We have to ignore that here.
3. Only to be considered is other Phone calls for that day. Lets say P1 having call with 2 participants, P2 having some 4 participants which fall in the time period of P1. Then we should consider P1 and P2 the common period
4. In order to find number of concurrent calls happened for a day basing on callstarttime and callendtime. What would be the query?
5. Should consider the Timeperiod or the bucket with 1 hour as the period.
6. A Phone Call P1, Phone Call P2, should have matching (common) time ( keeping all the scenarios) is required for this query.
Result for Concurrent calls for a day should be like below. Should get all the concurrent connections happened for a particular day.
Date|TimePeriod/Bucket(hr part)|Concurrentconnections|
Jan-01-2015|01 to 02|3
Jan-01-2015|11 to 12|2
Jan-02-2015|04 to 05|5
Jan-02-2015|12 to 13|13
........
ii) So once the above is achieved.
Have to find the Maximum concurrent connections for day from the above.
For below Maximum Concurrent connections are '3'
Date|TimePeriod/Bucket(hr part)|Concurrentconnections|
Jan-01-2015|01 to 02|3
Jan-01-2015|11 to 12|2
Hence the Result for Maximum Concurrent Connections would be
Date|TimePeriod/Bucket(hr part)|MaxConcurrentconnections|
Jan-01-2015|01 to 02|3
Jan-02-2015|12 to 13|13
.............
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Dec 19, 2006
what is maximum no. of concurrent Logins Possible on a SQL server 2005 Database?
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May 11, 2007
I know that if I set the Package.MaxConcurrentExecutables Property to -1, it will execute the maximum number of concurrent running executables to equal the number of processors plus two.
I have a requirement where I have to run the maximum number of concurrent running executables. However, the number of concurrent executables to run varies each month (it is not fixed).
If I have a loop inside the package that executes each stored procedure (same sproc, different parameter), will SQL Server execute the maximum number of concurrent running executables possible? (It may execute 4 or 8 at a time and that is fine.)
Thanks,
Michael
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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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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 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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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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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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Aug 18, 2005
When running SQL Server Express on a Windows XP Pro OS, is there a limit to the number of concurrent users or connections to the database?
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Dec 16, 2004
Standard costs 2000 euros approx (5CALs)
Enterprise costs 40000 euros apprx
Standard only supports 2GB or RAM
How many concurrent users do you think standard edtion can handle in a Dual Xeon 2.8 with 2GB ram ?
Enterprise is very expensive. sucks that standard can't handle more than 2GB Ram
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May 12, 2003
Does anyone know how to reserve a number of concurrent user licenses /per server logins in MSSQL 2000? I have a situation where I have more users than I have licenses for an enterprise SQL application and would like to make sure that a certain group of users always has access to the system. Individuals who only need inquiry access should only be allowed to login if there are licences available beyond the core group of users. Any Ideas? Thanks.
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Jun 22, 2007
Hi,
In one CPU installation of SSRS 2005, are there any restriction on number of users accessing the same concurrently?
Please let me know.
Regards,
TNR
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Feb 6, 2007
Hi,I have a web app, that runs fine, except for one particular section that uses a class called by an event in the code behind. The class resides as a dll in the bin folder. We had no problems during testing, when only one user was running this dll. Problems soon occurred when multiple users tried running it. Here's the error & stack: 06/02/2007 09:25:26 ==> cburns ==> There is already an open DataReader associated with this Command which must be closed first. at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command) at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) at System.Data.SqlClient.SqlCommand.ExecuteReader() at ESP.Validator.Data.DatabaseEvents.DatabaseEventManager.Read(IEventable eventObject, Int16 eventType, DateTime earliestDate, DateTime latestDate) in C:My PathValidatorValidator.NETDataDatabaseEventsDatabaseEventManager.cs:line 92 at ESP.Validator.Data.Translink.CATCard.GetDespatchDate() in C:My PathProjectsValidatorValidator.NETDataTranslinkCATCard.cs:line 94 at ESP.Validator.Data.Translink.ExistingSchemeEntitlement.ReadCards() in C:My PathProjectsValidatorValidator.NETDataTranslinkExistingSchemeEntitlement.cs:line 215 at ESP.Validator.Data.Translink.ExistingSchemeEntitlement.Read() in C:My PathProjectsValidatorValidator.NETDataTranslinkExistingSchemeEntitlement.cs:line 147 at ESP.Validator.Data.Translink.TranslinkApplicant.ReadEntitlements() in C:My PathProjectsValidatorValidator.NETDataTranslinkTranslinkApplicant.cs:line 369 at ESP.Validator.Data.Translink.TranslinkApplicant.Read() in C:My PathProjectsValidatorValidator.NETDataTranslinkTranslinkApplicant.cs:line 353 at ESP.Validator.Data.Translink.PrePrintedLetter.Read() in C:My PathProjectsValidatorValidator.NETDataTranslinkPrePrintedLetter.cs:line 282 at ESP.Validator.ValidationProcessor.Read(ValidationSubject subject) in C:My PathProjectsValidatorValidator.NETValidationProcessor.cs:line 82 at clear_applications_scan_applications.ProcessValidation() It seems the data reader is getting reused. We have ensured after each read the reader is closed. Though all users are using the same connection string. Could it be a connection pool problem, with the connection being overwritten during execution? Should i edit it according to the users logon?I am really at a loss for ideas, and I don't mind admitting I am a bit out of my depth with this one!! Any ideas/suggestions would be greatly appreciated. Thanks
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Feb 2, 2015
I am researching this and playing with using the syss.sysprocesses view and counting the dbid column. I would most likely want to store this information in a table with a date/time stamp because we really want to track our concurrent users during the day for awhile. Do you have any neat tricks in getting this done? Is there a DMV or Information_Schema view that could be used to accomplish this task? I found the following code on the internet:
SELECT DB_NAME(dbid) AS DBName,
COUNT(dbid) AS NumberOfConnections,
loginame AS LoginName,
nt_domain AS NT_Domain,
nt_username AS NT_UserName,
hostname AS HostName
FROM sys.sysprocesses
[Code] ....
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May 29, 2001
Can anyone tell me the maximum number of (if there is a maximum) for the following :-
1. SQL Server Users per Database
2. Roles per Database
3. Connections per Server
4. Logins per Server
Thanks.
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Sep 12, 2015
I have some code I build 2 weeks ago which I’ve been running daily but it’s suddenly stopped working with the following error.
“The table "tbl_Intraday_Tmp" has been created, but its maximum row size exceeds the allowed maximum of 8060 bytes. INSERT or UPDATE to this table will fail if the resulting row exceeds the size limit” When I google this there seems to be a related to tables with vast numbers of columns.
My table tbl_Intraday_tmp is relatively small. It has 7 columns. 1 of varchar(5), 3 of decimal(9,3) and 2 of decimal(18,0). The bit I’m puzzled with is it was working and stopped.
I don’t recall changing anything but I wouldn’t rule that out. I ‘ve inspected the source files and I don’t believe they have changed either.
DECLARE
@FileName varchar(50),
@Path varchar(50),
@SqlCmd varchar(1000)
= '',
@ASXCode varchar(5),
@Offset decimal(18,0),
[code]....
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Apr 20, 2012
I am using MS SQL server 2008, and i have a table with 350 columns and when i m trying to create one more column its giving error with below message -
Warning: The table XXX has been created, but its maximum row size exceeds the allowed maximum of 8060 bytes.
INSERT or UPDATE to this table will fail if the resulting row exceeds the size limit.
how can i resolve this?
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Oct 1, 2005
Hi,
Can somebody let me know how many (maxi) no of users can be created to deal with MSDERelA ?
With kind regards,
Ashfaque
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Oct 28, 2007
I need a small SQL server for up to 10 users. If I understand the EULAs and FAQs correctly, there is no limit on the number of users imposed by the SQL Server 2005 Express license. If so, then the number of users is only limited by the OS's license so all I need is SQL Server 2005 Express (free), Windows XP Pro (10 users limit) and no CALs for either Windows or SQL Server.
I'd be thankful if someone could verify this.
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Feb 17, 2007
we're planning to use sql express as our database server in our office. the database will consist of accounting, purchasing, marketing, sales, inventory, production and hrd tables. 80-100 users will use the system simultaneously in adding, editing, deleting, reports.
i need some advice on the following:
1. maximum users that can log on to the database simultaneously?
2. maximum size of the database?
tnx
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Mar 2, 2000
When attempting to view the articles which belong to a publication the error 823 is raised. The replication is working fine but can the publication can not be altered or deleted. An article in the publication needs to be removed to allow structure change. Any one seen this message before?
Error 823: I/O error 38 (reached end of file) detected during read of BUF pointer=ox1161zcdo page ptr = 0x13a9e000 pageid = (ox1:ox1495a) dbid=7, status=0x801 file d:mssql7datawestdeeping_data.mdf
Any one have any idead on what causes it or how to get around it or prevent it again??
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Jun 16, 2015
Is there any maximum cap on the number of users that could be created in a given database of MS-SQL Server?
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Sep 7, 2007
i believe this is the right thread... i recently had an issue where my xpstar.dll would not register and i read to fix the issue to reapply the SP so i installed SP4 i now am getting this error... please help!
2007-09-07 14:24:19.24 server Logging SQL Server messages in file 'C:Program FilesMicrosoft SQL ServerMSSQLlogERRORLOG'.
2007-09-07 14:24:19.24 server SQL Server is starting at priority class 'normal'(4 CPUs detected).
2007-09-07 14:24:19.36 server SQL Server configured for thread mode processing.
2007-09-07 14:24:19.38 server Using dynamic lock allocation. [2500] Lock Blocks, [5000] Lock Owner Blocks.
2007-09-07 14:24:19.40 server Attempting to initialize Distributed Transaction Coordinator.
2007-09-07 14:24:20.44 spid3 Starting up database 'master'.
2007-09-07 14:24:20.49 spid3 Error: 823, Severity: 24, State: 5.
2007-09-07 14:24:20.49 spid3 ReadFileHdr: Operating system error 38(Reached the end of the file.) encountered.
2007-09-07 14:24:20.49 spid3 Error: 5159, Severity: 16, State: 3.
2007-09-07 14:24:20.49 spid3 09/07/07 14:24:20 Stack Overflow Dump not possible - Exception c00000fd E at 0x00449CA1
2007-09-07 14:24:20.49 spid3 Address=449ca1 Exception Code = c00000fd
2007-09-07 14:24:20.49 spid3 eax=ba65a0de ebx=00000002 ecx=42ba8740 edx=0bb0a830
2007-09-07 14:24:20.49 spid3 esi=00000001 edi=42ba8740 eip=00449ca1 esp=0bb09fc4
2007-09-07 14:24:20.49 spid3 ebp=0bb0a56c efl=00010212
2007-09-07 14:24:20.49 spid3 cs=1b ss=23 ds=23 es=23 fs=3b gs=0
2007-09-07 14:24:20.49 spid3 1: Frame: 0BB0A56C Return Address 00449CA1
2007-09-07 14:24:20.49 spid3 2: Frame: 0BB0AD88 Return Address 00449E10
2007-09-07 14:24:20.49 spid3 3: Frame: 0BB0AD9C Return Address 0044A14B
2007-09-07 14:24:20.49 spid3 4: Frame: 0BB0ADAC Return Address 0044A17D
2007-09-07 14:24:20.49 spid3 5: Frame: 0BB0ADF8 Return Address 0044A19B
2007-09-07 14:24:20.49 spid3 6: Frame: 0BB0AE18 Return Address 004CD11C
2007-09-07 14:24:20.49 spid3 7: Frame: 0BB0B2A8 Return Address 005ED83E
2007-09-07 14:24:20.49 spid3 8: Frame: 0BB0B2FC Return Address 00405473
2007-09-07 14:24:20.49 spid3 9: Frame: 0BB0B324 Return Address 00449357
2007-09-07 14:24:20.49 spid3 10: Frame: 0BB0B350 Return Address 00449329
2007-09-07 14:24:20.49 spid3 11: Frame: 0BB0B378 Return Address 00448EE1
2007-09-07 14:24:20.49 spid3 12: Frame: 0BB0B3E0 Return Address 0060CFF5
2007-09-07 14:24:20.49 spid3 13: Frame: 0BB0BC04 Return Address 006D0991
2007-09-07 14:24:20.49 spid3 14: Frame: 0BB0BC18 Return Address 0044A14B
2007-09-07 14:24:20.49 spid3 15: Frame: 0BB0BC28 Return Address 0044A17D
2007-09-07 14:24:20.49 spid3 16: Frame: 0BB0BC74 Return Address 0044A19B
2007-09-07 14:24:20.49 spid3 17: Frame: 0BB0BC94 Return Address 004CD11C
2007-09-07 14:24:20.49 spid3 18: Frame: 0BB0C124 Return Address 005ED83E
2007-09-07 14:24:20.49 spid3 19: Frame: 0BB0C178 Return Address 00405473
2007-09-07 14:24:20.49 spid3 20: Frame: 0BB0C1A0 Return Address 00449357
2007-09-07 14:24:20.49 spid3
2007-09-07 14:24:20.49 spid3 TotalPhysicalMemory = 2146951168, AvailablePhysicalMemory = 1552097280
2007-09-07 14:24:20.49 spid3 AvailableVirtualMemory = 376274944, AvailablePagingFile = 3696713728
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Aug 5, 2015
I have a simple SP that returns 2 columns with 4 inner joins, results are about 100 odd rows max, nothing complicated. When I run the SP via SSMS it works fine, as soon as this is run via an application server the SP fails to complete with the error :
Internal error: An expression services limit has been reached. Please look for potentially complex expressions in your query, and try to simplify them.
We are not getting anywhere near the expression limit so I cannot understand why we are suddenly receiving this error. 2 weeks ago this query was running fine, no updates have been rolled out to the SQL database servers or application servers but the error is suddenly appearing on both prod and dev environments.
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Jul 23, 2005
On my server running SQL Server 2000 (SP3). I frequently get thisinformational message in the Event Viewer log.17052 :This SQL Server has been optimized for 8 concurrent queries. This limit hasbeen exceeded by 2 queries and performance may be adversely affected.The application that I am running is a vendor application so I do not haveaccess to the code. I contacted the vendor, but they have never seen thisproblem and cannot recreate it. I checked the Microsoft Knowledge Base forhelp, but I came up empty. It seems like it should be a simpleconfiguration change.Any advice?Thanks,Jeff
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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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