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This completes our overview of the Oracle architecture. In this chapter, we defined the terms instance and database and saw how to connect to the database through either a dedicated server connection or a shared server connection. Figure 2-6 sums up the material covered in the chapter and shows the interaction between a client using a shared server connection and a client using a dedicated server connection. It also shows that an Oracle instance may use both connection types simultaneously. (In fact, an Oracle database always supports dedicated server connections even when configured for shared server.)

Each field value is stored in an object that implements the IFieldData interface. In other words, each field value is stored in an object that maintains the field value, along with some metadata about the field value. That interface is declared like this: Public Interface IFieldData Inherits ITrackStatus ReadOnly Property Name() As String Property Value() As Object Sub MarkClean() End Interface This interface ensures that each field is stored in an object that exposes the name of the field and the field s value and allows the field to be marked as being unchanged. This interface inherits from ITrackStatus, which I discussed in 6 and will cover in depth in 8. The result is that any IFieldData is guaranteed to expose status-tracking properties such as IsDirty and IsValid. There s also a generic version of the interface. Public Interface IFieldData(Of T) Inherits IFieldData Overloads Property Value() As T End Interface This generic interface simply extends the interface with a strongly typed Value property that replaces the loosely typed one. The reason for the generic interface is performance. Most field values are value types, such as Integer, Single, and DateTime. If you store such values in a field of type Object, .NET will do what is called boxing and unboxing, meaning that the value will be converted into and out of being an Object rather than being a simple value type. The field manager always attempts to store values in an IFieldData(Of T) first, falling back to an IFieldData only if necessary. This helps avoid the cost of boxing and unboxing value types.

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Figure 2-6. Connection overview Now you re ready to take a more in-depth look at the files that comprise the database and the processes behind the server what they do and how they interact with each other. You re also ready to look inside the SGA to see what it contains and what its purpose is. You ll start in the next chapter by looking at the types of files Oracle uses to manage the data and the role of each file type.

In this chapter, we will examine the eight major file types that make up a database and instance. The files associated with an instance are simply Parameter files: These files tell the Oracle instance where to find the control files, and they also specify certain initialization parameters that define how big certain memory structures are, and so on. We will investigate the two options available for storing database parameter files. Trace files: These are diagnostic files created by a server process, generally in response to some exceptional error condition. Alert files: These are similar to trace files, but they contain information about expected events, and they also alert the DBA in a single, centralized file of many database events.

Now that you ve seen the IFieldData and IFieldData(Of T) interfaces, it should come as no surprise that the framework includes a default implementation. Only IFieldData(Of T) is implemented in the framework, because the field manager always stores values using a strongly typed approach. The primary purpose of the FieldData class is to store a field value, along with important metadata about that field. In particular, it also stores the field s name, type, and a flag indicating whether the field has been changed. The implementation provided by FieldData is designed for performance over advanced functionality. For example, it determines whether a field has been changed by maintaining a simple flag that is set to True any time the value is changed. Public Overridable Property Value() As T Get Return _data End Get Set(ByVal value As T) _data = value _isDirty = True End Set End Property

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