Ms-sql 7 Concurrent Connections
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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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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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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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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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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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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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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Jun 16, 2006
Hi folks,
That is the question: how many concurrent connections support Microsoft SQL Server 2005?
Thanks in advance,
Javier.
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Aug 23, 2001
How would I go about finding out what my high-water mark would be for concurrent
connections over a period of time (SQL Server 7, SP 3 applied)?
Thanks in advance!!!
Gary Andrews
andrews_gary_w@solarturbines.com
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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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Aug 19, 2014
I have a DB that is currently not normalized and will be getting about 100K concurrent users that will mostly be doing Read-Only operations from multiple tables.
I am trying to figure out if I should start thinking of having a DB per client (1000 clients) or if I should normalize the database and keep it as a single DB with good indexes and partitioning.
Hardware is not a problem but 100K concurrent users is.
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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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May 17, 2005
Hi 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.
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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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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 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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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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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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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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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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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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Nov 21, 2007
When running MS SQL Server on a Windows XP Pro OS, is there a limit to the number of concurrent users or connections to the database? We want to run server for education in the high school (MS Select licence), we need 16 concurrent connections.
Thanks for any help.
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Aug 31, 2007
Hi!
We are migrating an DB2 database to sql server 2005. We have used the 1.2 jdbc driver. It consumes lots of memory when we have several resultssets opened on different statments. Then we tried JTDS (http://jtds.sourceforge.net/), it worked fine. It's supports concurrent staments. We would like to stick with microsofts driver. My question is: will we se this supported in microsofts driver (soon)!
Joachim
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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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