SQL Database Access - Multiple Clients Issue
Sep 28, 2006
Hi Everyone,
I have one database file which needs to be accesable to both a .net website and a vb.net application.
The application collects data from the 'real world', processes it and adds the data to the database. The Website reads data from the database and displays the data in a graphical format.
Now for the problem; While the Application is connected to the database (adding data), the Website is denied acces to the database. All connections to the DB are disposed when the Application is not uploading data, but the Website continues to be locked out (making it pretty useless) Closing the Application makes the Website work fine, but of course this means no 'real world' data can be updated.
Can anyone suggest what is happening here, and more importantly how to fix it? A walkthrough must be available for this problem somewhere,... I just can't find it :(
Thanks all,
*The Stressed One*
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Jun 2, 2007
I have a SQL Server 2005 Express database that was designed to be used by one client. What is the best way to change the design so it can contain multiple clients that can only see data entered by users of each client organization?
Also I'm using the asp.net membership database to handle login and profiles. Can this be used with my multi client database?
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Jul 20, 2005
Hello AllI am using SQL server 2000 as the backend of my application but don'twant my clients tobe able to view or edit the database tables, storedprocedures , view etc using enterprise manager or query analyser (orsimilar tools)How can this be done ?I searched a lot for this but unable to get the correct answer isthere anybody to give full solution regarding this.Please relpy me as early as possible
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Jul 20, 2005
Hi all,I've got a question concerning synchronization of multiple database clients.Consider a database, accessed by two clients. Is it guarantted, that ifclient 1 succefully commits a transaction, client 2 _instantly_ sees thechanges made by client 1?thx and regards,StephanP.S..: For MS Jet databases I know there _is_ a delay between writing datato the database and being able to read this updated value from anotherconnection,so the question refers to "real" DBMs (esp. SQL Server) only ;)
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Jul 5, 2007
We have a situation where multiple-random client connections to SQL server get disconnected.
The workstations are not consistent, the time is not consistent, and the functions being run are not consistent. One thing that we can reproduce is that sometime, but not always, if a workstation runs a function that calls a specific stored procedure (SQL native client, ADO, SQL Server 2005 SP2), during the course of the parameter validation (after the .execute) SQL sends an ACK, RST followed by two RST TCP packet back to the client and disconnects the connection.
At the same time, several other connections across multiple computers are also dropped by SQL. However, some computers may have multiple connections to SQL and some, but not all of these will be dropped. Other computers will
not have their connections dropped at all.
No SQL server errors are logged. Trace flags 4029 and 3689 have been set.
We have the network packet traces and the SQL profiler output to show this.
This is not reproducable at any other site.
Any ideas on what this could be would be greatly appreciated.
--
Dana Comolli
MS ISV Partner
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Aug 6, 2007
Hi all,
I've been running SQL Server 2005 for over three months, and have got the database up to speed. Using SSMSE for an interface.
I've have been trying to get the Intranet to link to the database (ASP), but after a little research i found we needed to change the Authentication from 'Windows Authentication' to a mix of windows auth and sql login. Needing to restart the server for the changes to take effect.
After the restart things started to go pear shaped.
Before the restart we were able to run queries from different clients at the same time (4 workstations). Now we are unable to access anything on the database if a query is running on a seperate client. As in table properties, running a query. As i've said, we were able to do this perfectly fine before the restart.
We also use other programs to generate records for the database. These programs now have difficulty connecting to the database. We've gone through the wizards and as far as we are aware things should be working. We have created extra username/logins for these programs so not one computer/client/program uses the same connection login. However, they are unable to connect even after the wizard says there is no problem connecting to the server.
Is there any *restore to factory/default settings* button? We've even tried reverting to Windows Authentication to try and solve the problem, but it didn't work, we're pretty dependant on the database for day to day operations.
Anyone with an idea as to what's wrong?
Thanks in advance
Gary.
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Nov 12, 2006
Hi to all!
My problem comes from this situation: I have two PC connected via a network calble; on the first I have SQL Server 2005 Express, an MDF data file in a shared directory under the "Document and Settings" path, and my program written in VB .NET 2005. On the second PC I have only my program, and I would like to have it connect to and work on the MDF on the first PC.
The program on the first PC works well and uses a connection string like the following:
Data Source=.SQLEXPRESS;AttachDbFilename=<path><name>.mdf;;Integrated Security=True;User Instance=True
I am able to access to SQL Express from the second PC (I have enabled the Client to use the right TCP ports, told the firewall to let them work and enabled the Guest user on the first PC to use SQL Express), but from Visual Studio Server Explorer I cannot reach my data file: any attempt fails telling me that I cannot open it because is in a shared location... I can only open the DBs located in the "Data Directory" of SQL Express...
In other words, what should I do to have two or more clients work on the same DB under SQL Express? Is it mandatory that the DB .MDF file resides in the "C:ProgramsMicrosoft SQL ServerMSSQL.1MSSQLData" directory so that it can be permanently attached to SQL Express?
Thanks for your help!!!
Roberto
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Sep 25, 2007
I have a system use MS SQL 2005 & .NET 2.0, my tables don't have rowversion, but I heard SQL 2005 manage a rowversion by itself, can I use this to do a "ConflictDetection".All I try to do is I want to get a error when I try to update a row which been modified by someone else after I read row. Thanks.
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Jul 30, 2014
I have a script that needs to be run for 50 different @ClientID. I dont want to run this script individually for each clientid. Would 'SET @clientID in (111, 222, 333) work? I've been told that it wouldn't. Short version of the script is.....
DECLARE @ClientID varchar (MAX)
DECLARE @UserID varchar (MAX)
SET @ClientID = 111 -- Replace with Client ID
SET @UserID = 5656 -- Replace with your ID
[Code] .....
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Mar 29, 2007
I think I will have a problem with Id’s when I do merge replication. The problem is, I have several clients (local shops) who can do additions to a (Customer) table. Other tables will link to that table (things that a customer buys) with their foreign key, so the id of this table is very important. Now, twice a day that table with customers is merged from all clients to the central server. (the table with things that the customer buys, does not needs to be merged as it only remains local).
Possible problem:
if we assign ranges to identifiers for each client (thus local shop), which will be the best option we found until so far, how can we then detect the doubles? (with doubles, we mean that when the same customer is added in two local shops for a first time, then we will have the same customer twice in the central database)(afterwards, when we delete one customer row in the central database, we might have a id conflict when we merge back to the clients -as a customer might have already bought some goods at the two different shops meanwhile-)
What’s the common practice to resolve this?
(we need to do Merge Replication, because during the day, our local shops are disconnected from the central server)
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May 8, 2007
Hi!
We have multiple databases (1 per client) and we want to use reporting services for ad-hoc reporting. Our authentication is done by using client's database so security is custom.
What is the best way to set this up? Is it possible to somehow allow users/admins to use only their database and never see any others? I know we can install a separate instance of RS and do that but I am wondering if there is a better way to run multiple clients doing different reports using exclusively their databases without having to create a new instance.
Thanks
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Feb 29, 2008
Hello,I'm looking into offering a custom data driven web app that I wrote for an organization that I'm apart of to other similar organizations. I would be hosting the data and web application code on my dedicated server. This application is using the membership api supplied in .NET 2.0 and also has my own custom data tables within it.My question is what would be the best way to add clients to this? Should I simply create a new database for each new client like so: ACME_Database, ABC_Database, AAA_Database etc. Or should I add some sort of client "Tag" (tag meaning column within each datatable) to these databases and then update my SQL queries to process them accordingly. I imagine I could do both but I guess I need some advice from people that already had experiance with providing this kind of service. Thanks!Jason
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Sep 19, 2006
Greetings, I have a requirement for a SQL Server 2005 database to
notify 3rd Party applications of a table change. As is stands now, 3rd
Party applications access the database via a Data Access Layer (DAL)
dll (C#). I'd like to somehow implement an asychronous event
notification scheme via the same DAL to these clients.
Can someone offer a clever way to implement such events?
Broker Services? I am under the impression the SSBS is typically deployed when databases are to communicate with one another.
Triggers to call some CLR code?
Other?
Thanks in advance,
Loopsludge
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Aug 31, 2004
How can i access multiple sqlserver database using VB
eg. insert 1 record in a database from other databse.
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Jan 12, 2005
Hi ,
Im developing a web application which would make access to multiple distributive databases. The problem is....the database from all the third parties may have different standard.
For instance....a user wish to retrive a record from many databases, he input "Pentium 4" .....but some database may have different standard, they may have a record with name "P4" instead of "Pentium 4"....so my question is , how should i make it standard ?? thanks
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Sep 16, 2015
I have a single database and 5 user which use this database for DDL and DML operations.
The problem we are facing here is, every time a user need to do some work in this database he/she had to ask(manually) to rest of the 4 users whether they are doing some task over the same DB or not. Sometime due to communication gap one user open any transaction which creates a deadlock for another user to execute any query over the same tables in this DBI want to get rid of this problem by making it configurable from SQL Server part so that if any user which is already accessing this DB, so the other user don't get access to it, Â kind of Mutually exclusive behavior.
How to do this.
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Jun 3, 2014
I have been using the software, and it has been working fine (on windows user A). Now, I have created another windows user (User B), and would like to use the same software/database. The software launches fine (User B), but cannot access the created SQL database (created with user A)
How do I setup the database to allow access from all users on the same PC?
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Aug 17, 2000
We have been asked to look into using stored procedures with SQL Server 7.0 as a way to speed up a clients site. 99% of all the articles I have read along with all the books all say Stored Procedure should be used whenever possible as opposed to putting the SQL in your ASP script. However one of my colleagues has been speaking to Microsoft and they said that that they were surprised that our client wanted to use Stored Procedures as this was the old method of database access and that now he should really consider using COM objects for data access as itis much faster. Has anyone got any views on this or know of any good aticles regarding this matter ?
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Sep 13, 2007
Hi,
I'm trying to create a database that takes specific information from a number of databases on different servers to make some reporting that we have much easier.
I'm pretty new to SQL so I'm not sure of the best way to proceed. I read an article that suggested I use the OPENROWSET command. The problem is, the version of SQL that came with one of the programmes we use is limited and will not allow you to turn on the allow "Ad Hoc distributed Queries" so the SLQ statement will not execute.
I'm confused why it won't let me to connect through ODBC as I've created a web page that selects data from this database with no problems!
Here is the SQL statement that I've written to make sure it is the correct one (on the msdn library page it said that this was the ODBC connection):
SELECT a.*
FROM OPENROWSET('MSDASQL','DRIVER=(SQL Server);SERVER=APPOLOACT7;UID=sa;PWD=***************',
'SELECT * FROM MDCTestAndDev.dbo.TBL_CONTACT') AS a
I've also created the ODBC connection using the tool on Administration Tools>Data Sources ODBC
Any help would be greatly appreciated (also any ways of selecting from one database and inserting it into another will be helpfull)
Thanks
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Jun 10, 2015
I have recently upgraded to SQL2014 on Win2012. The Access front end program works fine.
But, previously created Excel reports with built in MS Queries now fail with the above error for users with MS 2013. The queries still work for users still using MS 2007.Â
I also cannot create any new queries and get the same error message. If I log on as myself on the domain to another PC with 2007 installed it works fine, so I don't think it is anything to do with AD groups or permissions.
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Mar 25, 2008
I need to determine the following about the current authenticated Windows domain user who is trying to access a SQL Server via a trusted connection.
1 Has the current user been granted login access to the trusted SQL Server?
2 Has the current user been granted access to a specific database?
3 Is the current user a member of a specific database role such as (DB_ROLE_ADMINISTRATORS)?
Thanks,
Sean
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May 29, 2008
I'm trying to get the last ten unique clients viewed by each user. I have tried using the TOP (N) but it does not show the last ten just any ten.
When a user views a client record, a record is saved to the tblUserRecentViewedClients table and includes logID (key), client_id (int), username (nvarchar), lastviewed (datetime).
Here is what I have so far. Can anyone offer any suggestions?SELECT TOP (10) tblUserRecentViewedClients.UserName, tblUserRecentViewedClients.Client_ID, tblClient.FirstName, tblClient.LastName,
tblClient.CompanyName
FROM tblUserRecentViewedClients INNER JOIN
tblClient ON tblUserRecentViewedClients.client_ID = tblClient.client_ID
WHERE tblUserRecentViewedClients.UserName=@UserName
GROUP BY tblUserRecentViewedClients.UserName, tblUserRecentViewedClients.Client_ID, tblClient.FirstName, tblClient.LastName,
tblClient.CompanyName
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Jan 15, 2004
If i use sql server as my backend and microsoft access as my frontend do i need to purchase client access lisences??
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Feb 15, 2000
I have to install SQL 7.0 Client software (query analyzer, client connectivity) on A LOT of workstations that only have Internet Explorer 3.0 ... Is there any way of getting around not upgrading to 4.0 sp1? If I try to just install 7.0 client, it errors out saying I need IE 4.0sp1. I really don't want to have upgrade IE!!!
Thanks in advance.
Laura
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Sep 2, 2000
Is anyone using a mail client other than Outlook to work with SQL Server 7.0? If so, what are you using, and what is your opinion of it?
Doug
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Nov 4, 1999
Are there any issues with retaining both the SQL 6.5 and SQL 7.0 clients as
installed components on our desktops? We have a number of SQL 6.5 and 7.0
Servers which have some fairly specific client side requirements and I am
trying to ascertain what the potential impact is to rolling out SQL 7.0
components to a separate directory to allow all applications to coexist. My
specific concerns are with the shared DLL's in system32 and with updated
7.0 executables that share the same name (i.e. BCP, etc) and resultant path
issues.
Any feedback or articles that cover this subject would be appreciated.
Thanks,
A
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Mar 11, 2004
We use mdac 2.7 on all servers and clients
We want to update servers to 2.8
Do we MUST update clints to 2.8 or they
can continue to run with 2.7
Thank you
Alex
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Oct 25, 2005
I have situation like this:
Company with one head office and one remote office. In the two offices I have two domains with two PDCs. The two networks are connected with eachother through leased line and the routers are configured properly. The SQL Server is on the PDC in head office and "local" clients connect fine. I cannot connect from the remote office. I think that I have folowing solutions:
1. make trust relationships between two domains - it will be hard a little bit because second PDC is samba on linux
2. make all clients in remote office to be members of the head office domain - potential problems if the leased line drops
3. make all clients to log in with same account as SQL Server logs locally - stupid
4. something else - what?
Thanks in advance!
Daniel
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Oct 24, 2005
Can anyone recommend a tool where I can email to someone both the SQLquery and the result set? Right now, I'm just copying the results to aspreadsheet. No, I can't use Reporting Services or Crystal Reports.
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Sep 24, 2005
“HELP !! We’ve lost about 25 client’s websites. The databases were backed up along with all the actual files contained within each CSK….in addition, all the original databases are intact & can be reattached to the new SQL server…..the problem that exists where the original CSK files do not recognize the original database once it is reattached to the new SQL server. Any help would be most appreciated.
This is the error……
Login failed for user 'DARRYL1ASPNET'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'DARRYL1ASPNET'.Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[SqlException: Login failed for user 'DARRYL1ASPNET'.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) +472
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) +372
System.Data.SqlClient.SqlConnection.Open() +384
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) +44
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +304
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +77
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet) +38
ASPNET.StarterKit.Communities.CommunityUtility.GetAllCommunitiesFromDB() +93
ASPNET.StarterKit.Communities.CommunityUtility.GetAllCommunities() +58
ASPNET.StarterKit.Communities.CommunityUtility.GetCommunityInfo() +327
ASPNET.StarterKit.Communities.CommunitiesModule.Application_BeginRequest(Object source, EventArgs e) +221
System.Web.SyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() +60
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87
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Jul 20, 2002
We’re having trouble getting error messages to show up on clients. Our ADO research indicates that the Errors collections is populated, “automatically” – what you do with it is up to the application. Our collection is not being populated. MS says the SQLOLEDB provider has a problem (the collection is not filled) if SET NOCOUNT is OFF. We have SET NOCOUNT ON and still have the problem. We have narrowed the problem down (the example below is an abbreviated version) to “the Errors Collection is not populated if the Raiserror follows a SELECT statement that returns a recordset”.
In the code below the simple select run after the first RAISERROR appears to “block” the Error Collection. Is this by design? Are you never supposed to be able to return records and messages from the same program? We can code around it if we have to, but the documentation seems to indicate our approach is viable.
Any ideas would be most appreciated.
SQL Stored Procedure:
CREATE PROCEDURE Address_Ck
(
@Address_ID INTEGER OUTPUT
, @MailOnly_LG BIT
, @Ctry_ID SMALLINT
, @StPv_ID SMALLINT
, @PostCode_ID INT
, @PostCode_Ext_CH CHAR(10)
, @Add1_VC VARCHAR(60)
, @Add2_VC VARCHAR(60)
, @Add3_VC VARCHAR(60)
, @Add4_VC VARCHAR(60)
, @City_VC VARCHAR(30)
, @City_Lock_LG BIT
, @Directions_VC VARCHAR(2000)
)
AS
DECLARE
@Finder_VC VARCHAR(20)
, @Label1_VC VARCHAR(60)
, @Label2_VC VARCHAR(60)
, @Label3_VC VARCHAR(60)
, @Label4_VC VARCHAR(60)
, @Label5_VC VARCHAR(60)
, @Label6_VC VARCHAR(60)
-- the error in the next line shows up when not commented out
--RAISERROR ( ‘ This error always shows up.’ ,16,1)
SELECT Address_ID
, Label1_VC
, Label2_VC
, Label3_VC
, Label4_VC
, Label5_VC
, Label6_VC
FROM Address_T
WHERE Finder_VC= @Finder_VC
RAISERROR ( ‘ Why won’t this error showup?. ’ ,16,1)
-- the error above never shows up
************************************************** ****
************************************************** ****
THE VB CODE:
Option Explicit
Dim db As New ADODB.Connection
Dim cmd As New ADODB.Command
Dim rs As New ADODB.Recordset
Private Sub Command1_Click()
On Error GoTo errmsg
Set rs = New ADODB.Recordset
Set cmd = New ADODB.Command
With db
.Provider = "SQLOLEDB"
.ConnectionString = "Data Source=Jeanne;trusted_connection = true;integrated security=sspi"
.Open
.DefaultDatabase = "DevTime21"
End With
With cmd
.ActiveConnection = db
.CommandType = adCmdStoredProc
.CommandText = "address_findck_okinsert_m"
.Parameters.Append .CreateParameter("@address_id", _
adInteger, adParamOutput, 4)
.Parameters.Append .CreateParameter("@Mailonly_lg", _
adBoolean, adParamInput, 1, False)
.Parameters.Append .CreateParameter("@ctry_id", _
adInteger, adParamInput, 4, 1)
.Parameters.Append .CreateParameter("@stpv_id", _
adInteger, adParamInput, 4, 1)
.Parameters.Append .CreateParameter("@postid_id", _
adInteger, adParamInput, 4, 0)
.Parameters.Append .CreateParameter("@postcode_ext", _
adChar, adParamInput, 10, "")
.Parameters.Append .CreateParameter("@add1_vc", _
adVarChar, adParamInput, 60, "")
.Parameters.Append .CreateParameter("@add2_vc", _
adVarChar, adParamInput, 60, "")
.Parameters.Append .CreateParameter("@add3_vc", _
adVarChar, adParamInput, 60, "")
.Parameters.Append .CreateParameter("@add4_vc", _
adVarChar, adParamInput, 60, "")
.Parameters.Append .CreateParameter("@city_vc", _
adVarChar, adParamInput, 30, "")
.Parameters.Append .CreateParameter("@city_lock_lg", _
adBoolean, adParamInput, 1, False)
.Parameters.Append .CreateParameter("@directions_vc", _
adVarChar, adParamInput, 2000, "")
End With
rs.CursorLocation = adUseClient
rs.Open cmd, , adOpenStatic, adLockBatchOptimistic
If Not IsNull(cmd("@address_id")) Then
Else
MsgBox "Please contact System Administrator. There was a problem adding address."
End If
Exit Sub
errmsg:
Call errormsginfo
End Sub
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Jun 8, 2007
I am someting of a newbie to SQL Server, but I am an experienced C++/C# programmer.
I have a SQL Server 2005 DB to which are connected 50 or so clients.
The clients are running my software, written in C# and connected to the server by an OleDBConnection.
These connections are long-lived; in some cases they remain for days or more.
Now and again, one of the clients causes a change to the DB (not structural, just normal adds, update and deletes).
But most of the time the clients are just viewing data in the DB.
What I need to happen is that when any item of information changes, the display of that information on any of the clients which are viewing it must be updated quickly.
It doesn't have to be instant, but a delay or more than, say, 5 seconds is unacceptable.
It is like a share-dealing or foreign exchange system (although that is not what it is) where the traders' screens have to have up-to-date information at all times.
Note that the information received by the clients does not have to describe the change in detail, just a hint to the client as to what change has happened so that the client can refresh its views.
I can think of a way of doing this but it is really nasty.
The hints would be recorded in a time-stamped table. Each client would poll every couple of seconds by calling a SP, which would return the hints which have been added since the last time that client polled.
But polling is horrible and I am sure that there must be a better way.
A route that looks promising is InfoMessages. But, reading around the subject, it looks like these cannot be unsolicited and spontaneous; they only arrive on a Connection as a result of some action on that Connection.
I may have missed something, or maybe InfoMessages are not the way to go.
Can anyone offer me any advice, please
TIA,
Paul
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