与普及数据库的连接速度很慢

Question

This has been an on going issue at my place of work. Previously, we had a co-op programming student write us some applications using C# which ran well on his laptop, but once the applications were put to use on different computers, the connection to the pervasive database because painfully slow.

Now I am writing a simple VB.net application which need to query the Pervasive database, and I'm running into the same issue.

here's my code:

 'PSQL variables
        Dim myPsqlConnection As PsqlConnection = New PsqlConnection("ServerName=FILESERVER;ServerDSN=SAGE2")
        Dim queryString As String
        queryString = "SELECT NAME FROM CUSTOMER"
        Dim MyCommand As New PsqlCommand(queryString, myPsqlConnection)
        Dim MyReader As PsqlDataReader
        Dim tempCustname As String


        Try 'open conncetion to Pervasive DB
            myPsqlConnection.Open()
        Catch ex As Exception
            MsgBox("COULD NOT OPEN A CONNECTION TO THE DATABASE" & vbCrLf & ex.Message)
            Exit Sub
        End Try

        Try 'execute Pervasive query
            MyReader = MyCommand.ExecuteReader
        Catch ex As Exception
            MsgBox("QUERY ERROR" & vbCrLf & ex.Message)
            Exit Sub
        End Try
        If MyReader.HasRows = False Then
            MsgBox("NO RESULTS FOUND")
            Exit Sub
        End If
        While (MyReader.Read)
            tempCustname = MyReader("NAME").ToString()
            Customers.Items.Add(tempCustname)
        End While
        MyReader.Close()
        myPsqlConnection.Close()

I stepped through the program and it take about 30 seconds to get past the line where it opens the connection.

As for the specs (I'll do my best):

My computer is quite powerful (16 gb or ram, 6 core AMD processor at 3.0 Ghz per core, windows 7 home 64 bit)

Pervasive.Data.SqlClient Version 3.2

Compiling with Microsoft Visual Basic 2010 Express

There are very few computers on this network (about 7), and I have no such trouble with MS Access databases. Our server is new 2 years ago, and out network has been upgraded to a GB connection. I should note I know very little about databases in general, let alone connecting with VB. I'm not really the best person to be doing this, but I'm still the most qualified person in our small company.

Answer 1

I've got it working now. The solution was to first install the database in the pervasive control center. First by selecting "new database" from the main window of the PCC and filling in the database name, location, username and password.

Next I changed the connection from pervasive ADO to OLEDB. My connection string now looks like this:

Dim myPsqlConnection As OleDbConnection = New OleDbConnection("Provider=PervasiveOLEDB;Data Source=DatabaseName;Location=FILESERVER")

Thanks to all everyone for your help!