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Using the DB_BLOCK_CHECKING parameter, you can set the database to check for corrupted data blocks. You can set this parameter to low, medium, or full, with each level involving a progressively higher amount of block checking (or you can set it to off to turn it off). When you enable block checking, Oracle automatically checks a block for consistency each time that block is modified. If a block isn t consistent, Oracle will mark it as corrupt and create a trace file. Depending on your workload, there is a 1 to 10 percent overhead when you turn block checking on. Oracle recommends that you turn block checking on. Note that Oracle checks the blocks in the System tablespace in all settings. You can set the DB_BLOCK_CHECKING parameter to one of the following: OFF or FALSE: The database doesn t perform block checking for tablespaces other than the System tablespace. LOW: The database performs only basic block header checks after a change of the block contents in memory. MEDIUM: In addition to the checks performed under the LOW setting, the database also performs semantic block checking for all non-index-organized table blocks. FULL or TRUE: The database performs all the checks specified under the LOW and MEDIUM settings, and additionally, performs semantic checks for index blocks. Example: DB_BLOCK_CHECKING = medium Default value: false Parameter type: Dynamic. You can use the ALTER SYSTEM or ALTER SESSION command to change this parameter.

Private Sub ResponseReceived(ByVal theSequenceNumber As Integer, _ ByVal theResponse As String, _ ByVal theProcessingTime As TimeSpan) Dim s As String = DateTime.Now.ToString("HH:mm:ss.ffff") Dim item As New ListViewItem(s) s = CInt(theProcessingTime.TotalMilliseconds).ToString() item.SubItems.Add(s + " ms") item.SubItems.Add(theSequenceNumber.ToString()) item.SubItems.Add(theResponse) listViewResponses.Items.Add(item) _numberOfRequestsInProgress -= 1 LabelRequestsInProgress.Text = _numberOfRequestsInProgress.ToString() If _numberOfRequestsInProgress = 0 Then Cursor = Cursors.Default End If End Sub End Class FormMain only handles logic related to the UI. Although the program uses multithreading to send pipelined requests, FormMain contains no threading logic whatsoever. Management of threading issues is relegated to the Coordinator, which is fairly simple. For each request, the Coordinator creates a new thread. Listing 12-23 and Listing 12-24 show C# and VB .NET implementations of the Coordinator. Listing 12-23. The C# Implementation of the Coordinator Used in the Client Program public class Coordinator { // object used to synchronize events with UI thread Control uiControl; // the component to test HttpService.CoordinatorRequestHandler requestHandler; public Coordinator(Control theUiControl) { uiControl = theUiControl; requestHandler = HttpService.CoordinatorRequestHandler.Singleton; } public void Send(int theNumberOfPipelinedRequests) { for (int i = 0; i < theNumberOfPipelinedRequests; i++) { Thread thread = new Thread(new ThreadStart(SendRequest)); thread.Name = string.Format("Request{0}", i); thread.IsBackground = true; thread.Start(); } }

You use the DB_SECUREFILE parameter to specify whether you want the database to treat large objects as SecureFiles, new in Oracle Database 11g, or traditional BasicFiles. If you set this parameter to the value NEVER, the database will create all LOBS that you specify as SecureFiles as traditional BasicFiles. The value PERMITTED allows the creation of LOBs as SecureFiles. You can also assign the values ALWAYS and NEVER for this parameter. Example: DB_SECUREFILE = always Default value: PERMITTED Parameter type: You can change this parameter with either the ALTER SYSTEM or the ALTER SESSION statement.

The following initialization parameters concern database security, including password authentication.

// this method runs on a background thread void SendRequest() { DateTime startTime = DateTime.Now; FireRequestSent(); // RequestHandler.Send blocks until a response comes back int sequenceNumber; string response = requestHandler.Send( "http://localhost", startTime.ToString("HH:mm:ss.ffffff"), out sequenceNumber); TimeSpan responseTime = DateTime.Now.Subtract(startTime); FireResponseReceived(sequenceNumber, response, responseTime); } #region Events // the following events are fired on the UI thread public delegate void RequestSentHandler(); public event RequestSentHandler OnRequestSent; void FireRequestSent() { if (OnRequestSent != null) uiControl.Invoke(OnRequestSent); } public delegate void ResponseReceivedHandler( int theSequenceNumber, string theResponse, TimeSpan theProcessingTime); public event ResponseReceivedHandler OnResponseReceived; void FireResponseReceived(int theSequenceNumber, string theResponse, TimeSpan theProcessingTime) { if (OnResponseReceived != null) uiControl.Invoke(OnResponseReceived, new object[] {theSequenceNumber, theResponse, theProcessingTime}); } #endregion } Listing 12-24. The VB .NET Implementation of the Coordinator Used in the Client Program Public Class Coordinator ' object used to synchronize events with UI thread Private _uiControl As Control ' the component to test Private _requestHandler As HttpService.CoordinatorRequestHandler

Oracle uses the value of the OS_AUTHENT_PREFIX parameter as a prefix to the operating system authenticated usernames. Default value: OPS$ Parameter type: Static

The default value of OPS$ is well known to Oracle DBAs. However, Oracle suggests that you set the prefix value to the null string "" (OS_AUTHENT_PREFIX =""), which implies that you mustn t add any prefix to operating system account names.