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The original collection performs the requested operation and adds or removes the child object. Of course, that triggers a ListChanged event from the original collection. Recall that in the constructor of SortedBindingList, the original collection s ListChanged event was handled by the SourceChanged() method. I ll cover the SourceChanged() method in a moment, and you ll see how the ListChanged event is suppressed when the add or remove operation is initiated by the view itself. The Insert() method is simpler: Public Sub Insert(ByVal index As Integer, ByVal item As T) _ Implements System.Collections.Generic.IList(Of T).Insert mList.Insert(index, item) End Sub Private Sub Insert(ByVal index As Integer, ByVal value As Object) _ Implements System.Collections.IList.Insert Insert(index, CType(value, T)) End Sub When a new item is inserted into the view, it is really inserted into the original collection. This results in the original collection raising its ListChanged event, and in turn the view then raises its ListChanged event (in the SourceChanged() method in the following code). The end result is that the view raises the ListChanged event exactly once, which is the desired goal.

No Binds 0/0 406/1 2,830/4 9,400/5 13,800/20 30,800/80 40,800/154 56,300/240 74,600/374 60,000/450 120/1 230/1 354/1 17/0 Binds

0 and does not have a meaning for client applications; we will discuss that parameter in detail later, with server applications For example, to connect with a server at the address 192168101100 on the port 80, you need the following code: Socket clientSocket = new Socket(AddressfamilyInterNetwork, SocketTypeStream, ProtocolTypeTcp); IPEndPoint serverEndPoint = new IPEndPoint(DottedDecimalToIp(192, 168, 101, 100), 80); // port no clientSocketConnect(serverEndPoint); You can obtain the two endpoints of the socket when a connection is available with the RemoteEndPoint and LocalEndPoint properties Casting these into an IPEndPoint object will make the IP address available over the Address property You can determine the individual bytes of an IP address with the GetAddressBytes method, which supplies a byte array With IP version 4, GetAddressBytes returns a byte array of 4 bytes.

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The interesting observation for me is that 10 users using bind variables (and very few latch requests as a result) use the same amount of hardware resources as 2 to 2.5 users that do not use bind variables (i.e., that overuse a latch, or process more than they need to). When you examine the results for 10 users, you see that nonuse of bind variables results in the use of 6 times the CPU and takes 3.4 times the execution time when compared to the bind variable solution. The more users are added over time, the longer each user spends waiting for these latches. We went from an average of 4 seconds/session of wait time for latches with 5 users to an average of 45 seconds/session of wait time with 10 users. However, the implementation that avoided overuse of the latch suffered no ill effects as it scaled up.

The source collection s ListChanged event is handled by the SourceChanged() method. This allows SortedBindingList to re-sort the data if it is changed in the original collection, thus keeping the view current. It also means that the event can be reraised by the view so that any UI components bound to the sorted view are also aware that the underlying data has changed. If no sort has been applied, then the only thing the SourceChanged() method needs to do is reraise the event: Private Sub SourceChanged( _ ByVal sender As Object, ByVal e As ListChangedEventArgs) If mSorted Then Select Case e.ListChangedType ' update sorted view based on type of change End Select Else OnListChanged(e) End If End Sub

So far we have looked mostly at locks that Oracle places for us transparently. When we update a table, Oracle places a TM lock on it to prevent other sessions from dropping that table (or performing most DDL, in fact). We have TX locks that are left on the various blocks we modify so others can tell what data we own. The database employs DDL locks to protect objects from change while we ourselves are changing them. It uses latches and locks internally to protect its own structure. Next, let s take a look at how we can get involved in some of this locking action. Our options are as follows: Manually lock data via a SQL statement. Create our own locks via the DBMS_LOCK package. In the following sections, we will briefly discuss why you might want to do each of these.

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