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The OPTIMIZER_FEATURES_ENABLE parameter enables the database to retain the behavior of an older Oracle software release after you upgrade it. For example, after upgrading an Oracle 10.2 release database to the Oracle 11.1 release, you can set the OPTIMIZER_FEATURES_ENABLE parameter to 10.2, thus retaining the optimizer behavior of Oracle Database 10g Release 2. Example: OPTIMIZER_FEATURES_ENABLE = 10.2 Default value: 11.1.0.6 Parameter type: Dynamic. You can use the ALTER SESSION or the ALTER SYSTEM command to make changes.

Public Function Add(ByVal theSequenceNumber As Integer, ByVal theRequest As String) _ As ThreadSemaphore SyncLock (Me) Dim semaphore As ThreadSemaphore = GetFirstAvailableSemaphore() _blockedRequests.Add(theSequenceNumber, semaphore) semaphore.requestEvent.Reset() semaphore.sequenceNumber = theSequenceNumber semaphore.request = theRequest semaphore.response = Nothing semaphore.startTime = DateTime.Now Return semaphore End SyncLock End Function Function GetFirstAvailableSemaphore() As ThreadSemaphore SyncLock (Me) For Each semaphore As ThreadSemaphore In _semaphores If Not semaphore.inUse Then semaphore.inUse = True Return semaphore End If Next End SyncLock Throw New Exception("RequestQueue: No semaphores available") End Function Public Sub Remove(ByVal theSequenceNumber As Integer) SyncLock (Me) Dim semaphore As ThreadSemaphore = _ DirectCast(_blockedRequests(theSequenceNumber), _ ThreadSemaphore) _blockedRequests.Remove(theSequenceNumber) semaphore.inUse = False End SyncLock End Sub Public Function [Get](ByVal theSequenceNumber As Integer) As ThreadSemaphore Return DirectCast(_blockedRequests(theSequenceNumber), ThreadSemaphore) End Function End Class When a response is detected, class Receiver fires a Receive event to CoordinatorConnection, which then uses code to get the sleeping request thread, give it the response, and wake the thread up. Listing 12-19 shows in bold the line where the request thread s semaphore is signaled.

When an object doesn t have any optimizer statistics collected, Oracle dynamically samples the data in order to collect a quick set of statistics. You control the level of dynamic sampling by setting the OPTIMIZER_DYNAMIC_SAMPLING parameter. Example: OPTIMIZER_DYNAMIC_SAMPLING = 2 Default value: Ranges from 0 to 2, depending upon the value of the OPTIMIZER_FEATURES_ENABLE parameter (if less than 9.0.1, 0; for 9.2.0, 1; and for 10.0.0 or higher, 2). Parameter type: Dynamic. It can be modified by the ALTER SESSION or ALTER SYSTEM command.

The OPTIMIZER_USE_INVISIBLE_INDEXES parameter enables or disables the use of invisible indexes. Possible values are true and false. Example: OPTIMIZER_USE_INVISIBLE_INDEXES=true Default value: false Parameter type: Dynamic. You can modify it with the ALTER SESSION or ALTER SYSTEM command.

Listing 12-19. Using the BlockedRequests Class to Match Responses with Requests C# void HandleResponse(Socket theSocket) { // read the response HttpResponse response = new HttpResponse(theSocket); response.Get(); // get the semaphore for the blocked request thread ThreadSemaphore semaphore = blockedRequests.Get(response.SequenceNumber); if (semaphore == null) throw new Exception("No pending request found for response"); // save the response in the semaphore semaphore.response = response.Body; // unblock the request thread waiting for this response semaphore.Signal(); } VB .NET Sub HandleResponse(ByVal theSocket As Socket) ' read the response Dim response As New HttpResponse(theSocket) response.Get() ' get the semaphore for the blocked request thread Dim semaphore As ThreadSemaphore = _blockedRequests.Get(response.SequenceNumber) If semaphore Is Nothing Then Throw New Exception("No pending request found for response") End If ' save the response in the semaphore semaphore.response = response.Body ' unblock the request thread waiting for this response semaphore.Signal() End Sub The request thread was blocked in the Send method on the bold line shown in Listing 12-20. When the thread resumes (assuming a time-out doesn t occur), the response is available as a field in the ThreadSemaphore object. The code retrieves the response from ThreadSemaphore and returns it as the result of the Send method. When the method returns, the code is running on the original thread that the caller was on.

The OPTIMIZER_USE_PENDING_STATISTICS parameter specifies whether the cost optimizer can use pending statistics. Possible values are true and false. Example: OPTIMIZER_USE_PENDING_STATISTICS=true Default value: false Parameter type: Dynamic. You can modify it with the ALTER SESSION or ALTER SYSTEM command.

The OPTIMIZER_USE_SQL_PLAN_BASELINES initialization parameter enables or disables the use of SQL plan baselines stored in the database. If you enable SQL Plan Management by enabling this feature, the optimizer will look for a SQL plan baseline and choose the plan with the lowest cost. Possible values are true and false. Example: OPTIMIZER_USE_SQL_PLAN_BASELINES=true Default value: true Parameter type: Dynamic. You can modify it with the ALTER SESSION or ALTER SYSTEM command.