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If you turn off AUTOTRACE, SQL*Plus will terminate this additional session and you will no longer see it in V$SESSION A question you might ask is, Why does SQL*Plus do this trick The answer is fairly straightforward SQL*Plus does it for the same reason that we used a second SQL*Plus session in 4 to monitor memory and temporary space usage: if we had used a single session to monitor memory usage, we would have been using memory to do the monitoring By observing the statistics in a single session, we would change those.

Thread management Memory management Hardware I/O However, the .NET Micro Framework is not a full-featured operating system; it s a bootable runtime environment tailored for embedded development. That s how the .NET Micro Framework can run directly on the hardware without an underlying operating system. However, the .NET Micro Framework can still use an underlying operating system and its services; the extensible emulator running on Windows is an example of that.

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statistics. If SQL*Plus used a single session to report on the number of I/Os performed, how many bytes were transferred over the network, and how many sorts happened, then the queries used to find these details would be adding to the statistics themselves. They could be sorting, performing I/O, transferring data over the network (one would assume they would!), and so on. Hence, we need to use another session to measure correctly. So far, we ve seen a connection with one or two sessions. Now we d like to use SQL*Plus to see a connection with no session. That one is pretty easy. In the same SQL*Plus window used in the previous example, simply type the misleading command, DISCONNECT: ops$tkyte@ORA10G> disconnect Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 Production With the Partitioning, OLAP and Data Mining options ops$tkyte@ORA10G> Technically, that command should be called DESTROY_ALL_SESSIONS instead of DISCONNECT, since we haven t really disconnected physically.

Public ReadOnly Property IsAuthenticated() As Boolean _ Implements System.Security.Principal.IIdentity.IsAuthenticated Get Return mIsAuthenticated End Get End Property Public ReadOnly Property Name() As String _ Implements System.Security.Principal.IIdentity.Name Get Return mName End Get End Property Protected Overrides Function GetIdValue() As Object Return mName End Function Friend Function IsInRole(ByVal role As String) As Boolean Return mRoles.Contains(role) End Function Private Sub New() ' require use of factory methods End Sub <Serializable()> _ Private Class Criteria Private mUsername As String Public ReadOnly Property Username() As String Get Return mUsername End Get End Property Private mPassword As String Public ReadOnly Property Password() As String Get Return mPassword End Get End Property Public Sub New(ByVal username As String, ByVal password As String) mUsername = username mPassword = password End Sub End Class Friend Shared Function UnauthenticatedIdentity() As PTIdentity Return New PTIdentity End Function

Note The true disconnect in SQL*Plus is exit, as you would have to exit to completely destroy the

Friend Shared Function GetIdentity( _ ByVal username As String, ByVal password As String) As PTIdentity Return DataPortal.Fetch(Of PTIdentity)(New Criteria(username, password)) End Function Private Overloads Sub DataPortal_Fetch(ByVal criteria As Criteria) ' validate user identity against the database ' and load the user's roles End Sub End Class This CustomIdentity class inherits from Csla.ReadOnlyBase, and so is a fully functional business object in its own right. This means it has a Private constructor and a factory method that the CustomPrincipal object can call to authenticate the user. It also has another factory method that returns an unauthenticated version of the object to support anonymous or guest users. The DataPortal_Fetch() method needs to include the data access code to authenticate the username and password values against the database. The mIsAuthenticated field should be set accordingly. And if the credentials are valid, DataPortal_Fetch() must also load the user s roles into the mRoles list. 8 will implement a working custom principal and identity class as part of a sample application.

As I said, the .NET Micro Framework is not a full-featured operating system but a bootable runtime environment tailored for embedded development; it consists of the four layers shown in Figure 1-11.

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