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database it is accessing may be different from day to day or hour to hour, depending on my needs. By simply having many different parameter files, I can mount and open any one of these databases. Here, I have one instance at a time but many databases, only one of which is accessible at any time. So now when people talk about an instance, you ll know they mean the processes and memory of Oracle. When they mention the database, they are talking about the physical files that hold the data. A database may be accessible from many instances, but an instance will provide access to exactly one database at a time.

You re probably ready now for an abstract picture of what an Oracle instance and database look like, so take a look at Figure 2-1.

The BusinessBase and ReadOnlyBase classes expose a Protected property named FieldManager to make the FieldDataManager available to the business object s code. For example, this code is in BusinessBase: Protected ReadOnly Property FieldManager() As FieldManager.FieldDataManager Get If _fieldManager Is Nothing Then _fieldManager = New FieldManager.FieldDataManager(Me.GetType) UndoableBase.ResetChildEditLevel(_fieldManager, Me.EditLevel, Me.BindingEdit) End If Return _fieldManager End Get End Property

Figure 2-1. Oracle instance and database Figure 2-1 shows an Oracle instance and database in their simplest form. Oracle has a large chunk of memory called the SGA that it uses, for example, to do the following: Maintain many internal data structures that all processes need access to. Cache data from disk; buffer redo data before writing it to disk. Hold parsed SQL plans. And so on.

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Oracle has a set of processes that are attached to this SGA, and the mechanism by which they attach differs by operating system. In a UNIX environment, the processes will physically attach to a large shared memory segment, a chunk of memory allocated in the OS that may be accessed by many processes concurrently (generally using shmget() and shmat()). Under Windows, these processes simply use the C call, malloc() to allocate the memory, since they are really threads in one big process and hence share the same virtual memory space. Oracle will also have a set of files that the database processes or threads read and write (and Oracle processes are the only ones allowed to read or write these files). These files hold all of our table data, indexes, temporary space, redo logs, and so on. If you were to start up Oracle on a UNIX-based system and execute a ps command, you d see that many physical processes are running, with various names. You saw an example of that earlier when you

This property is designed to create an instance of the FieldDataManager only on demand. The idea is that if your business class never uses any managed backing fields, no FieldDataManager object will be created. I chose to do this to minimize the overhead involved in creating a business object when managed fields aren t used. This does complicate the use of the FieldManager property throughout the rest of BusinessBase and ReadOnlyBase. For example, BusinessBase includes this code: Public Overridable ReadOnly Property IsDirty() As Boolean Get Return IsSelfDirty OrElse _ (_fieldManager IsNot Nothing AndAlso FieldManager.IsDirty()) End Get End Property A parent object is considered dirty, or changed, if it or any of its child objects have been changed. To know whether the object has been changed, the IsDirty property checks the FieldManager to find out whether any managed fields or child objects have been changed. But before accessing the FieldManager property, it checks to see whether the _fieldManager field is Nothing. This prevents the accidental creation of a FieldDataManager instance when there are no managed fields in the business object. Getting back to the FieldManager property, you should see that a method called UndoableBase. ResetChildEditLevel() is called after the FieldDataManager instance is created. Technically, the FieldDataManager is a child object contained within the business object. Because it is a child object, its edit level for n-level undo must be kept in sync with the business object itself. I ll discuss the concept of edit levels in 11. For now, it is enough to know that the ResetChildEditLevel() call ensures that the new child object is in sync with its parent.

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