Oracle ODBC and DAO extremely slow

Question

Hi
I'm using Microsoft DAO 3.6 with an Oracle ODBC connection (version 9.2) in an VB6 application.
Opening an updateable dynaset is extremely slow, I have measured the performance with Oracle ODBC, Microsoft Oracle ODBC and Microsoft SQL-Server ODBC as follows:
Oracle ODBC: 1952 ms
MS Oracle ODBC: 360 ms
MS SQL-Server ODBC: 40 ms (connection to a MS SQL-Server)
If I use the SQLpassthrough option the result is about 10 ms in all 3 cases, but the dynaset is readonly !
The testing program is as follows:
Option Explicit
Private Declare Function timeGetTime Lib "winmm.dll" () As Long
Private Sub Form_Load()
Dim wsdata As DAO.Workspace
Dim db As DAO.Database
Dim dbconn As String
Dim rs As DAO.Recordset
Dim start As Long
dbconn = "ODBC;DSN=AdhocitORA;UID=adhocit;PWD=adhocit;"
Set wsdata = DBEngine.Workspaces(0)
Set db = wsdata.OpenDatabase("", False, False, dbconn)
start = timeGetTime
Set rs = db.OpenRecordset("Select * from Afdeling", dbOpenDynaset)
rs.MoveLast
rs.MoveFirst
rs.Close
Set rs = Nothing
MsgBox "Time " & timeGetTime - start
End Sub
Is there any setting in the Oracle ODBC, that need to be adjusted ??
Erling

Answer 1

Why are you doing a moveLast followed by a moveFirst? That's going to force Oracle to retrieve all the records in the recordset. If there are a lot of records, you'll probably see a benefit if you increase the prefetch in the Oracle ODBC DSN configuration.
Justin