[VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded
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Thread: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

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  1. #1
    Join Date
    Feb 2014
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    3

    Question [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    Hello,

    I have an aplication that checks in specific time if database file was changed and if the changes were made shows datatable in dgv

    All code is given in Timer Tick. Unfortunately on each 1000 ticks I receive error - System.Data.OleDb.OleDbException (0x800045005) system resources exceeded.
    I tried to make a code that dispose / close everything to prevent more than 1000 objects connections but still error appears

    My sample code (I removed thingst that are not needed)
    Code:
     
    Try
    Using Myconn As New System.Data.OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=" & mypath & ";" & "Extended Properties=dBASE IV;")
      Using Mycmd As New OleDb.OleDbCommand("SELECT * FROM " & Filename, Myconn)
         Using Mydt As New DataTable
            Using Myadapter As New OleDb.OleDbDataAdapter(Mycmd)
                Myadapter.Fill(Mydt)                                         <- CODE BREAK  error System.Data.OleDb.OleDbException (0x800045005)
               
    
    .....
    
                Myadapter.Dispose()
                GC.SuppressFinalize(Myadapter)
                Myadapter.Dispose()
             End Using
             Mydt.Clear()
             Mydt.Dispose()
             Mydt.Clear()
             GC.Collect()
             GC.SuppressFinalize(Mydt)
             Mydt.Dispose()
             End Using
          Mycmd.Dispose()
          Mycmd.Connection = Nothing
          GC.SuppressFinalize(Mycmd)
        End Using
        Mycn.ConnectionString = Nothing
        Mycn.Close()
        If Not cn Is Nothing Then
           CType(Mycn, IDisposable).Dispose()
        End If
       GC.SuppressFinalize(Mycn)
       Mycn.Dispose()
     End Using
    
    Catch ex1 As Exception
    Timer1.Stop()
        MessageBox.Show("Error occurred: " & vbCrLf & ex1.ToString)
    Finally
        GC.Collect()
    End Try
    Does anyone could help me solve this problem ?

  2. #2
    Join Date
    Feb 2014
    Posts
    3

    Re: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    For sure I have some problems with data adapter when I'm removing code related to data adapter I can make >1000 repeats ...

    I also tried this:

    Set running in timer tick - function -> and in function

    Code:
    Dim mydt As New DataTable
    Dim mycn As Odbc.OdbcConnection
    Dim mycmd As Odbc.OdbcCommand
    Dim mydr As Odbc.OdbcDataReader
    
    
            Try
                mycn = New Odbc.OdbcConnection("Driver={Microsoft dBASE Driver (*.dbf)};DriverID=277;Dbq=" & mypath)
                mycmd = New Odbc.OdbcCommand("SELECT * FROM " & Filename, mycn)
                mycn.Open()
                mydr = mycmd.ExecuteReader(CommandBehavior.CloseConnection)    <- System.Data.Odbc.OdbcException (0x80131937): ERROR [HY001]
                myDataTable.Load(mydr)
                mydr.Close()
    
            Catch ex1 As Exception
                myDataTable = Nothing
    
                MessageBox.Show("Error occurred: " & vbCrLf & ex1.ToString)
            Finally
                If mycn.State = ConnectionState.Open Then
                    mycn.Close()
                End If
                mycn.ConnectionString = Nothing
                mycn.Dispose()
    
                mycmd.Dispose()
                GC.Collect()
            End Try
            Return myDataTable
    I receive an error :
    System.Data.Odbc.OdbcException (0x80131937): ERROR [HY001]
    Last edited by 13mic13; February 27th, 2014 at 08:59 AM.

  3. #3
    Join Date
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    Sunny South Africa
    Posts
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    Re: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    I am a bit late to the party, and all the booze is finished....

    Anyways, have you tried specifying the fields explicitly, instead of using *. For example :

    Code:
    SELECT Field1, Field2, Field3 FROM " & Filename, mycn
    Give that a shot and let us know if that worked.

    Good luck !

    Hannes

  4. #4
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    Re: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    or open the table in SQL Management Studio and get it working. It will show each error
    David

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  5. #5
    DataMiser is offline Super Moderator Power Poster
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    Re: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    I am curious how you are checking to see if the file has changed here or are you just doing that select on every tick?

    Have you considered trying to use the file system watcher instead? I haven't tried it with a Access database but I would think it would probably trigger when the file is changed, could be a better solution than what you have now.
    Always use [code][/code] tags when posting code.

  6. #6
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    Re: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    sure. each tick takes 15-20ms to fire. DB Read prolly adds another 1/2 second to each one.
    David

    CodeGuru Article: Bound Controls are Evil-VB6
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    2006 Dell CSP
    2006, 2007 & 2008 MVP Visual Basic
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  7. #7
    Join Date
    Feb 2014
    Posts
    3

    Re: [VB.NET 4.0] System.Data.OleDb.OleDbException- system resources exceeded

    Hello,

    thank You all for the answers.

    DataMiser:
    In each tick I'm checking File.Exists. Then File.GetLastWriteTime if time is different than time stored in memory, code is executed.
    I'll try to use File system watcher - to be honest I even didn't know this function


    David:
    from the beginning I had set up time between tick to 30sec. Unfortunately always getting system error after 1000 ticks

    Hannes:
    SELECT Field1, Field2, Field3 FROM " & Filename, mycn <- also didn't helped


    I was trying to do something else that partially solved my problem I'm using now dataAdapter instead dataReader and I'm not closing/disposing connection and dataAdapter.
    At this moment application runs more than 6000 data reads, but I'm afraid that a the end I'll have problems with lack of memory...

    Thank You

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