Synchronization Of Multiple Clients

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 if
client 1 succefully commits a transaction, client 2 _instantly_ sees the
changes made by client 1?

thx and regards,

Stephan

P.S..: For MS Jet databases I know there _is_ a delay between writing data
to the database and being able to read this updated value from another
connection,
so the question refers to "real" DBMs (esp. SQL Server) only ;)

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Database For Multiple Clients

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?
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Jul 5, 2007

We have a situation where multiple-random client connections to SQL server get disconnected.

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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
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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,

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After the restart things started to go pear shaped.

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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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DECLARE @ClientID varchar (MAX)
DECLARE @UserID varchar (MAX)

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[Code] .....

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Mar 29, 2007

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Possible problem:
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What’s the common practice to resolve this?
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Hi!

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Hello,



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Thanks,

Phil

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Hello everybody,

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This is the initial synchronizaion (reinitalization at the subsciber). Client is using Microsoft.SQLServer.Replication objects from .net framework assemblies.

The synchronization starts normally (status is "Running"). The last message of selected session box shows (among other messages): "Beginning evaluating partial replication filters" then "Finished evaluating partial replication filters" and finally "Merge completed after processing xxx changes... etc." after a few seconds. Status changes to "Completed" and then... the merge process starts again!! "Beginning evaluating partial replication filters" etc. And this repeats about 15-20 times.

And so whole process takes about 15 minutes instead about 45 seconds to complete initial synchronization. The number of changes is "Merge completed after processing ..." never change since the first such message.

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I have situation like this:

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4. something else - what?

Thanks in advance!
Daniel

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Sep 24, 2005

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 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.
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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.
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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.
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Thanks



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I've tried limiting the amount of memory used by SQL, but this only accelerates the eventual client freeze-up. At the moment, I let SQL dynamically consume memory.

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SQL 7.0/SP1
P3-500
256MB

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1 Fruit eater 03-27-2014 01-10-2015
2 Veggi eater 01-16-2015 null
3 Veggi eater 12-05-2013 04-16-2015
4 Fruit eater 10-01-2014 11-30-2014

Currently I have a very ugly solution that I know is not the best one:

Select
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, sum(convert(int,Feb_2014)) as Tiers_in_Feb_2014
, sum(convert(int,Mar_2014 )) as Tiers_in_Mar_2014
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[code]....

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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,
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