DataReader getting slow after fetching 70000 records

Hi, I am invloved in a re-engineering project, which requires a table with 900000 records to be fetched in memory. I am using DataReader for the same but surpisingly; it is taking 10 minutes to fetch 80000 records. On debugging, I noticed that DataReader is getting slow in fetching the records after 70000. I have tried using the following providers, but same result 1. ODBC.NET 2. OLEDB.NET 3. ODP.NET I am also pasting the code using OLEDB Provider for reference. OleDbConnection objConnection = new OleDbConnection(ConnectionString) ; objConnection.Open() ; m_strQuery = @"SELECT DEALID,CMDDATE, SEGMENT1 FROM DELIVERYSHAPE WHERE DEALID < 20000 " ; This query will fetch 84,000 records OleDbCommand objCommand = new OleDbCommand(m_strQuery, objConnection) ; OleDbDataReader objReader = objCommand.ExecuteReader() ; while ( objReader.Read() ) { lCounter ++ ; } Database is Oracle 9i and client machine is Win XP. Any suggestions / help / link / pointers would be highly appreciated. Regards Chetan Sawhney