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The INSTANCE_TYPE parameter specifies whether your instance is a database instance or an Automatic Storage Management instance. You specify ASM if the instance is an Automatic Storage Management instance. A setting of RDBMS denotes a normal database instance.

A set of parameter values is specific to an Oracle database using ASM, and some parameters pertain only to the special ASM instances. You ll review these initialization parameters in 17, where I discuss ASM in detail.

The NLS_DATE_FORMAT parameter specifies the default date format Oracle will use. Oracle uses this date format when using the TO_CHAR or TO_DATE functions in SQL. There is a default value, which is derived from the NLS_TERRITORY parameter. For example, if the NLS_TERRITORY format is America, the NLS_DATE_FORMAT parameter is automatically set to the DD-MON-YY format. Example: NLS_DATE_FORMAT=DD-MM-YYYY HH:MI:SS Default value: Depends on the NLS_TERRITORY variable and the operating system Parameter type: Dynamic. This parameter can be altered by using the ALTER SESSION command.

Listing 12-13. The C# Implementation of the HttpResponse Class public class HttpResponse { Socket socket; HttpResponseHeader header; public HttpResponseHeader Header { get {return header;} } byte[] body; public byte[] Body { get {return body;} } public int SequenceNumber { get {return header.SequenceNumber;} } public HttpResponse(Socket theSocket) { socket = theSocket; } public void Get() { NetworkStream networkStream = new NetworkStream(socket); // read the response header header = new HttpResponseHeader(networkStream); // read the response body (if any) if (header.ContentLength == 0) return; byte[] buffer = new byte[header.ContentLength]; networkStream.Read(buffer, 0, buffer.Length); body = buffer; } }

You can specify several file-related parameters in your init.ora file. Oracle requires you to specify several destination locations for trace files and error messages. In addition, you need to specify the UTL_FILE_DIR parameter in order to use the UTL_FILE package. The following sections cover the key file-related parameters.

You can use the IFILE parameter to embed another initialization file in it. For example, you can have a line in your init.ora file such as this: ifile=config.ora In the config.ora file, you could then have some common initialization parameters for several instances. You can have up to three levels of nesting. Default value: No default value Parameter type: Static

Listing 12-14. The VB .NET Implementation of the HttpResponse Class Public Class HttpResponse Private _socket As Socket Private _header As HttpResponseHeader Public ReadOnly Property Header() As HttpResponseHeader Get Return _header End Get End Property Private _body As Byte() Public ReadOnly Property Body() As Byte() Get Return _body End Get End Property Public ReadOnly Property SequenceNumber() As Integer Get Return _header.SequenceNumber End Get End Property Public Sub New(ByVal theSocket As Socket) _socket = theSocket End Sub Public Sub [Get]() Dim networkStream As New NetworkStream(_socket) ' read the response header _header = New HttpResponseHeader(networkStream) ' read the response body (if any) If _header.ContentLength = 0 Then Return Dim buffer(_header.ContentLength - 1) As Byte networkStream.Read(buffer, 0, buffer.Length) _body = buffer End Sub End Class Class HttpResponse uses a helper class called HttpResponseHeader to handle the details of parsing the various fields of received HTTP messages. Listing 12-15 and Listing 12-16 show C# and VB .NET implementations of HttpResponseHeader.

Control files are key files that hold datafile names and locations and a lot of other important information. The database needs only one control file, but because this is such an important file, you always save multiple copies of it. The way to multiplex the control file is to simply specify multiple locations (up to a maximum of eight) in the CONTROL_FILES parameter. The minimum number of control files is one, but Oracle recommends you have at least two control files per instance, and most DBAs usually use three. If one of the control files is damaged or accidentally deleted, the instance will fail when it tries to access that control file. When this happens with multiple copies of the control file, you can always restart the database after first copying the undamaged control file to a different location.