Hi All,
I have a Windows 2003 Server. Planning to use SQL Server to act as the main Database Server which needs to cater to over 100's of simultaneous connections.
Can anyone share with me the default maximum simultaneous connections and the maximum allowed simultaneous connections for the following versions:
- MSDE
- 2000
- 2005 Express
- 2005
Hope I can get more professional advice from you guys.
Thanks.
Using the Import/Export Wizard, it is easy to set up SSIS jobs to import multiple tables in one task. However, SSIS appears to grab a connection to the source database and the destination database for each table indicated in the task sometime prior to doing the actual data transfer. Even though the transfer seems to be done a few tables at a time, all the connections are held throughout the execution of the task.
This has two effects:
1. The task may fail if the number of connections exceeds the limit of user connections set for the database
2. There is a severe impact on the other users of the databases (in my case, the source is a production system)
Is there any way to control the number of simultaneous connections that SSIS data transfer packages initiate?
I can, of course, define the package to have a small number of tables (thus limiting the connections), but in real life I need to transfer almost 700 tables, so limiting the number of tables per task to 20 or 25 produces an awkwardly large, and error prone, number of tasks. And since this definition must be done for multiple (not quite identical) databases, the extra effort of defining small collections of tables is signifcant.
Hi,
could somebody please let me know what is the maximum number of simultaneous users/connection per single SQL Server 7.0 box? Licenses are not the issue here, rather the number of physical connections supported before another server needs to be purchased.
Another variation of this question would be what's the highest number of databases that 7can be created on SQL 7.0 server and what is the highest number of physical connections supported per database? Again, licenses are not the issue. Thanks a lot in advance.
I was going over this article , and was intrigued by this statement "If SQL Server 2005 Express is running on Windows XP Home, it is limited to five simultaneous connections. If it is running on Windows 2000 or Windows XP Professional, it is limited to 10 simultaneous connections. However, these are limitations of the operating system and not of SQL Server 2005 Express."
What are simultaneous connections? Is this related to Max worker threads defined as 255 on other editions? How does underlying OS impose how many connections can be done to SQL server. And finally how many simultaneous connections can be done in Windows Server 2003?
Hi everyone!
Is it possible to control the number of simultaneous connections one login id can have?
I`d like to avoid my users to share their login ids and passwords to help them enter data into the system.
Thanks,
Mauricio
We have a production server that is configured to 100 user connections.
Without any reason, the maximum connections had been exceeded and users
can no longer access the sql. But if you sp_who , it displayed only
4 user connections. Since, I have an open connection before this error
happens, i was able to execute sp_who. This happened 4 times since we
installed the sql server. the version is 6.50.422 sp5a with hotfix.
To all gurus out there, can you give light into this problem?
Thanks in advance.
Newbie here.I've got my database set up in SQL 2000, and have started an Access adpfor a front end. I have 10 licenses, and at the moment the onlyaccesses are the server through Remote Desktop and one person into theADP. I started getting ODBC timeout errors when running a complexquery, so I started poking around. In the logs there's messages sayingthe maximum of 10 user connections has been reached, over and overagain. I'm not even certain that these problems are related, but itdoesn't look good.Why are all 10 connections used when there's only the server and oneclient? No one else has access to this server. And how can I stop theODBC timeout? That paticular complex query is the whole jsutificationfor using SQL over Access, so I kind of need it to work. :)Thanks in advance, maddman
View 8 Replies View RelatedHi,
Could somebody tell what is the maximum number of concurrent connections that are supported in sql server 2005 developer edition?
thanks
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.
Hi,
Environment:
I have a Sqlserver 6.5 production server used for web based applications
Compaq 5500 4 GIG RAM, 4 processor
Sql Memory config on that server is 1048576 (which is 2048 MB)
and the run value is 640000 (which is 1250 MB).
runvalue for user connections was 500
We have only 90 user connections may increase upto 100 depends on the connections. We don't have any overload on that server.
Error: I was seeing
"unable to connect maximum no. of 500 configured user connections are already connected" in the error log.
Action Taken:
I increased the user connections to 600
and rebooted the server. Immediately the same error I can see in the error log. But we have only 20 user connections at that time. I can able to connect.
Please advise me to get rid of this error.
Thanks,
Anu.
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
.............
Hi
I've implemented an SQL-CLR stored procedure which makes an HTTP connection using the WebClient class to a server where the processing on the web server takes 10 seconds.
If I fire off a bunch of requests to the stored procedure, e.g. 80 in 1 second I noticed that SQL Server 2005 (Express Edition) only allows 2 concurrent network connections at a time.
I can confirm this by looking at the timing of the results when they come back, basically I get 2 results every 10 seconds and by doing a 'netstat -a' on the web server I notice that there are never more than 2 HTTP connections from the SQL Server at a time.
Is this some sort of sheduling policy in terms of the number of concurrent external network accesses allowed by CLR objects running in SQL Server? Or some side effect of the way the WebClient class blocks in terms of waiting for a network response?
I was expecting all 80 of the requests to block waiting on a network response almost immediately and then for all 80 of them to pretty much complete and return 10-11 seconds later.
[Microsoft.SqlServer.Server.SqlProcedure]
public static int CreditAuthorisation(string Name, decimal Amount)
{
WebClient client = new WebClient();
string result = client.DownloadString("http://someserver/Test.aspx");
return int.Parse(result);
}
Cheers
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
View 5 Replies View RelatedI 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]....
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?
SQL Server 2000 8.00.760 (SP3)I've been working on a test system and the following UDF worked fine.It runs in the "current" database, and references another database onthe same server called 127-SuperQuote.CREATE FUNCTION fnGetFormattedAddress(@WorkID int)RETURNS varchar(130)ASBEGINDECLARE@Address1 As varchar(50)@ReturnAddress As varchar(130)SELECT@Address1 = [127-SuperQuote].dbo.tblCompany.Address1FROM[Work] INNER JOIN[127-SuperQuote].dbo.tblCompany ON [Work].ClientID =[127-SuperQuote].dbo.tblCompany.CompanyIDWHERE[Work].WorkID = @WorkIDIF @Address1 IS NOT NULLSET @ReturnAddress = @ReturnAddress + @Address1 + CHAR(13)+ CHAR(10)RETURN @ReturnAddressENDSo now the system has gone live and it turns out that the live"SuperQuote" database is on a different server.I've linked the server and changed the function as below, but I get anerror both in QA and when checking Syntax in the UDF builder:The number name 'Zen.SuperQuote.dbo.tblCompany' contains more than themaximum number of prefixes. The maximum is 3.CREATE FUNCTION fnGetFormattedAddress(@WorkID int)RETURNS varchar(130)ASBEGINDECLARE@Address1 As varchar(50)@ReturnAddress As varchar(130)SELECT@Address1 = Zen.SuperQuote.dbo.tblCompany.Address1FROM[Work] INNER JOINZen.SuperQuote.dbo.tblCompany ON [Work].ClientID =Zen.SuperQuote.dbo.tblCompany.CompanyIDWHERE[Work].WorkID = @WorkIDIF @Address1 IS NOT NULLSET @ReturnAddress = @ReturnAddress + @Address1 + CHAR(13)+ CHAR(10)RETURN @ReturnAddressENDHow can I get round this? By the way, I've rather simplified thefunction to ease readability. Also, I haven't posted any DDL because Idon't think that's the problem!ThanksEdward
View 2 Replies View RelatedIf multiple snapshots for the same report attempt to generate at the same second, is there something in place to prevent them from conflicting with each other?
Our SSRS 2005 application will use a console app that we are writing to change the default parameters on each report and call the CreateReportHistorySnapshot method. This application will be multi-threaded, so there is a possibility that multiple versions of the same report with different parameters will attempt to run at the same time. We need to be sure that these snapshots will not conflict and return the appropriate SnapshotHistoryID for that report run.
From looking at the History table in the ReportServer database it looks like there are uniqueIDs and other keys that would prevent duplicates, but what if the requests come in at the same time? Is SSRS 2005 smart enough to delay for a second so that there is not a duplicate? Since the way you reference these snapshots in your URL is with the Snapshot Time in UTC format, that only goes out to full seconds (2006-05-02T00:00:00).
Sorry for the length, but I could not think of how to condense this.
Thanks,
Steve
I have C# Express and the SQL Express Management Studio CTP installed. So far, I've been forced to disconnect from the server in one app to connect to it in the other. I understand there is something around a 4 connection limit in SQLServer Express, so I don't see the problem.
During one of these episodes, SQL Mgmt Studio hung while opening DB properties, then the SQLServer service couldn't be stopped. Now the DB can't be opened even after a reboot.
Help?
How can I simulate 1,000 simultaneous users in my database?
View 3 Replies View RelatedIs there a limit to the # of tasks ( Dumps) to a HD device ,which SQL 6.5 can perform simultaneously?
View 1 Replies View RelatedHi,
I have an application resource that is accessible from multiple clients applications that all have access to a common SQL Server db. By this, I mean, multiple clients can potentially connect to this resource at any given time. I want to limit the usage of this resource to one client at a time and was thinking about simply using SQL to maintain the name of the client that currently has "control" of the resource.
My question pertains to the case where two clients are executing a SQL query, simultaneously, to check whether someone has control of the resource or not. If two users were to simultaneously execute this query, do i have to lock the table in order to ensure that both users are not viewing data in an incorrect state? Or, does SQL Server ultimately execute the queries in a specific order? Meaning, the requests are simultaneous from a human standpoint but one request may have actually come in a millisecond before the other one and SQL server executes that query first, and then the second query. Is this how it works?
Thanks,
Paul
Greetings!
Are there any limit of simultaneous users and/or connections when running SQL Express? The free license of SQL Express, does that include use by any number of users/devices?
Regards
Harald Hedlund
Hi, can anyone help me? I want to know whether is it possible to insert records simultaneously in both master & detail tables?
For elaboration, say there is a master table contains (orderid,orderdate,amount) and details table contains (orderid, productid,qty,price). 1 record of master table associated with n records of details table. Can it be possible to insert both the 1 record at master table with n records in details table in a single sql statement?
hello to all,there are two databases named A and B.One database contains employee id as primaryI have another project database which includes that employee id asforeign key. How can I reflect my updations,deletionsthank you in advance,vishnu
View 2 Replies View RelatedIs there a way to get the Report Manager to allow a single user to
execute more than 1 report at a time? Currently, each user can only
have a single report being executed at a time. It looks like any
other reports are being queued and executed serially.
How can I prevent a package, or a section of a package, from being run more than once simultaneously? The package makes use of a staging database table, and if two copies of this package are run at the same time, there will be a race condition and possible corruption of the data in the database table. I have also noticed that the SSIS logging gets messed up and starts overwriting itself if I have more than one of these packages run at the same time.
What I am thinking of should work the same way as a serializable transaction lock on a normal query, where one query has to wait if another query has a lock on the table. I don't want the package to throw an error, I want it to wait until the other one is done.
I have been trying to use transactions in a test SSIS package, but they are not quite doing what I want them to do. I put various SSIS steps in a sequence container and require a serializable transaction. I have also tried putting the transaction at the package level, but that is not preventing simultaneous package runs.
Is there a built-in way to do this that is easy to implement? Otherwise, what I could do is insert a flag into the database indicating that a package is running, then make sure to reset the flag on any error or on completion. It seems like this alternate method could be error-prone though.
I am using SP2.
I am trying to insert into two tables simultaneously from a formview. I read a few posts regarding this, and that is how I've gotten this far. But VWD 2005 won't let me save the following stored procedure. The error I get says “Incorrect syntax near ‘@WIP’. Must declare the scalar variable “@ECReason? and “@WIP?.? I'm probably doing something stupid, but hopefully someone else will be able to save me the days of frustration in finding it. Thanks, the tables and procedures are below.
I made up the two tables just for testing, they are:
tbltest
ECID – int (PK)
Hello
I am trying to call the same package with different starting parameters using asynchronous method calls.
My code is
namespace ReconHost
{
public partial class HostContainer : Form
{
public delegate void InvokePackageHandler(
Microsoft.SqlServer.Dts.Runtime.Application app,
int var
);
Microsoft.SqlServer.Dts.Runtime.Application app;
public HostContainer()
{
InitializeComponent();
for (int i = 0; i < 2; i++)
{
app = new Microsoft.SqlServer.Dts.Runtime.Application();
InvokePackageHandler asyncInvokePackageHandler = InvokePackage;
asyncInvokePackageHandler.BeginInvoke(app, i, null, null);
}
}
public void InvokePackage(Microsoft.SqlServer.Dts.Runtime.Application app, int var)
{
Package pkg = app.LoadPackage(@"c:GRSGRSGRSTest_Async.dtsx", null);
pkg.Variables["intVar"].Value = var;
pkg.Execute();
pkg = null;
}
}
}
If I set the for loop to loop just once, the package is executed fine. Any more than once and only one instance of the package is executed.
Does anyone know what I am doing wrong? I know it is possible to execute the two package instances simultaneously because you can use DTexecUI.exe on two clients to do this.
Thanks in advance
Tomo
Hello everyone, I am hoping someone can help me with this problem. Iwill say up front that I am not a SQL Server DBA, I am a developer. Ihave an application that sends about 25 simultaneous queries to a SQLServer 2000 Standard Edition SP4 running on Windows 2000 Server with2.5 GB of memory. About 11 of these queries are over views (all overthe same table) and these queries are all done from JDBC but I am notsure that matters. Anyway, initially I had no problem with thesequeries on the tables and the views with about 4 years of information(I don't know how many rows off hand). Then we changed the tables toreplicated tables from another server and that increased the amount ofdata to 15 years worth and also required a simple inner join on 2columns to another table for those views.Now here is the issue. After times of inactivity or other times duringthe day with enough time between my test query run I get what lookslike blocking behavior on the queries to the views (remember these allgo to the same tables). I run my 25 queries and the 11 view queriesall take about 120 seconds each to return (they all are withinmilliseconds of each other like they all sat there and then werereleased for processing at the same time). The rest of the queries arefine. Now if I turn around and immediately run the 25 queries again,they all come back in a few seconds which is the normal amount of time.Also, if I run a query on one of views first (just one) and then runthe 25 queries they all come back in a few seconds as well.This tells me that some caching must be involved since the times are sodifferent between identical queries but I would expect that one of thequeries would cache and thus take longer but the other 10 would befast, not all block for 2 minutes. What is more puzzling is that thisbehavior didn't occur before where now the only differences are:1) 3 times more data (but that shouldn't cause a difference from 3seconds to 120 and all tables have been through the index wizard with aSQL trace file to recommend indexes)2) There is now a join between 2 tables where there wasn't before3) The tables are replicated throughout the day.I would appreciate any insight into this problem as 120 seconds is waytoo long to wait. Thanks in Advance.Chris
View 1 Replies View RelatedHi everyone. I hope that my question isn't too broad, but here it goes...
I am trying to figure out the best way to scale a SQL Server database so that it can handle a billion simultaneous users querying the same tables, and can easily scale to handle many billions of simultaneous users. The database must also have 999.99% availability. The number of licences and amount of hardware needed is not an issue.
Thanks in advance.
Hi Everyone,
I have a software solution that consists of two separate applications that share a SQL Server Express database on a single computer. Everything is working great, except when both of the applications want to access the database at the same time. All I can find is information on configuring multi-user access in a distributed system. I'd appreciate any information on configuring multi-application access on a single computer.
Thanks,
Mike
Hello, I have one store procedure that writes something data to one physical sql table 'MyTable' and on beginning I first call:DELETE FROM MyTableProcedure returns at the end data from 'MyTable' as on SELECT. PROBLEM:I started SQL Manager on my Laptop and on Computer near me and all pointed to same database (on Server) and I run that procedure simultaneously on Laptop and Computer at the same time (two hands on F5 button on these computers). Occasionally when clicking with both hands at the same time I got no records at the end of execution (on both computers), otherwise I got the results.WHAT I THINK IS PROBLEM:Somhow one SP start working and it did not come to the end and another computer called this SP and execute first command (DELETE FROM MyTable) and I got empty records at the end..WHAT I NEED:I need to prevent this situation to get empty records. All computers must get these records always. How I can use some sort of LOCKs to do this?Or to do that on C# application level using LOCK command? Thanks in advanceAleksandar
View 2 Replies View RelatedHi there,
Here we have got a
asp.net application that was developed when database was
sitting on SQL server 6.5. Now client has moved all of their databases
to SQL server 2000. When the database was on 6.5 the previous
development team has used oledb connections all over. As the databases
have been moved to SQL server 2000 now i am in process of changing the
database connection part. As part of the process i have a login
authorization code.
Private Function Authenticate(ByVal username As String, ByVal password As String, ByRef results As NorisSetupLib.AuthorizationResult) As Boolean
Dim conn As IDbConnection = GetConnection()
Try
Dim cmd As IDbCommand = conn.CreateCommand()
Dim sql As String = "EDSConfirmUpdate" '"EDSConfirmUpdate""PswdConfirmation"
'Dim cmd As SqlCommand = New SqlCommand("sql", conn)
cmd.CommandText = sql
cmd.CommandType = CommandType.StoredProcedure
NorisHelpers.DBHelpers.AddParam(cmd, "@logon", username)
NorisHelpers.DBHelpers.AddParam(cmd, "@password", password)
conn.Open()
'Get string for return values
Dim ReturnValue As String = cmd.ExecuteScalar.ToString
'Split string into array
Dim Values() As String = ReturnValue.Split(";~".ToCharArray)
'If the return code is CONTINUE, all is well. Otherwise, collect the
'reason why the result failed and let the user know
If Values(0) = "CONTINUE" Then
Return True
Else
results.Result = Values(0)
'Make sure there is a message being returned
If Values.Length > 1 Then
results.Message = Values(2)
End If
Return False
End If
Catch ex As Exception
Throw ex
Finally
If (Not conn Is Nothing AndAlso conn.State = ConnectionState.Open) Then
conn.Close()
End If
End Try
End Function
''' -----------------------------------------------------------------------------
''' <summary>
''' Getting the Connection from the config file
''' </summary>
''' <returns>A connection object</returns>
''' <remarks>
''' This is the same for all of the data classes.
''' Reads a specific
connection string from the web.config file for the service, creates a
connection object and returns it as an IDbConnection.
''' </remarks>
''' -----------------------------------------------------------------------------
Private Function GetConnection() As IDbConnection
'Dim conn As IDbConnection = New System.Data.OleDb.OleDbConnection
Dim conn As IDbConnection = New System.Data.SqlClient.SqlConnection
conn.ConnectionString = NorisHelpers.DBHelpers.GetConnectionString(NorisHelpers.DBHelpers.COMMON)
Return conn
End Function
in the above GetConnection() method i
have commented out the .net dataprovider for oledb and changed it to
.net dataprovider for SQLconnection. this function works fine. But in
the authenticate method above at the line
Dim ReturnValue As String = cmd.ExecuteScalar.ToString
for some reason its throwing the below error.
Run-time exception thrown : System.Data.SqlClient.SqlException - @password is not a parameter for procedure EDSConfirmUpdate.
If i comment out the
Dim conn As IDbConnection = New System.Data.SqlClient.SqlConnection
and uncomment the .net oledb provider,
Dim conn As IDbConnection = New System.Data.OleDb.OleDbConnection
then it works fine.
I also have changed the webconfig file as below.
<!--<add
key="Common" value='User ID=**secret**;pwd=**secret**;Data
Source="ESMALLDB2K";Initial Catalog=cj_common;Auto
Translate=True;Persist Security Info=False;Provider="SQLOLEDB.1";'
/>-->
<add key="Common" value='User ID=**secret**;pwd=**secret**;Data Source="ESMALLDB2K";Initial Catalog=cj_common;' />
Please help. Thanks in advance.