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The LICENSE_MAX_USERS parameter specifies the maximum number of users you can create in your database. The value of this parameter can range from zero to the number of user licenses. Example: LICENSE_MAX_USRS=1200 Default value: 0 Parameter type: Dynamic. You can issue the ALTER SYSTEM command to change the value of the parameter.

You can configure several performance-related parameters in your parameter file. In addition, you can set several parameters to change the diagnostic capabilities of the database when you re performing activities such as tracing SQL statements.

ErrorDetected()

You set the STATISTICS_LEVEL parameter to specify the level of statistics collection by Oracle. There are three possible values for this parameter: BASIC, TYPICAL, and ALL. Setting this parameter to the default value of TYPICAL will ensure the collection of all major statistics required for database selfmanagement and will provide the best overall performance. When the STATISTICS_LEVEL parameter is set to ALL, Oracle collects additional statistics, such as timed OS statistics and plan-execution statistics.

Example: STATISTICS_LEVEL = typical Default value: TYPICAL Parameter type: Modifiable with either the ALTER SESSION or the ALTER SYSTEM statement

Caution Setting the STATISTICS_LEVEL parameter to BASIC disables the collection of many of the important statistics required by Oracle Database 11g features and functionality, including these:

The idea of using a dedicated entity to represent signal entry/exit points of software components has been around for years. The port metaphor is used by several Architecture Description Languages (ADLs), including several ACME4 and several Wright.5 The Espresso component model6 uses input/ output lines that can be grouped into ports. C27 uses messages that all flow through a common port. On wiring diagrams, the term pin refers to the signal entry/exit points of objects. Pins are obviously abstractions, but they are useful to reinforce the notion that objects send and receive signals, and that wiring is required to move those signals around in a system. On wiring diagrams, each pin handles one signal. Pins are represented by black squares on the border of an object, as shown in Figure 7-14.

Automatic Workload Repository (AWR) snapshots Automatic Database Diagnostic Monitor (ADDM) All server-generated alerts Automatic Shared Memory Management Automatic optimizer statistics collection Buffer cache advisory and the mean time to recover (MTTR) advisory Timed statistics

The OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES parameter enables the SQL Plan Management feature by enabling the capturing of repeatable SQL statements and the generation of SQL plan baselines for those statements. Possible values for this parameter are true and false. Example: OPTIMIZER_CAPTURE_SQL_PLAN_BASELINES=true Default value: false Parameter type: Dynamic. Modifiable with the ALTER SESSION or the ALTER SYSTEM statement.

public ThreadSemaphore Get(int theSequenceNumber) { return blockedRequests[theSequenceNumber] as ThreadSemaphore; } } Listing 12-18. The VB .NET Implementation of ThreadSemaphore and RequestQueue Public Class ThreadSemaphore Public requestEvent As New ManualResetEvent(False) Public sequenceNumber As Integer Public request As String Public response As Byte() Public inUse As Boolean Public startTime As DateTime Public Function Wait(ByVal theDuration As TimeSpan) As Boolean Return requestEvent.WaitOne(theDuration, True) End Function Public Sub Signal() requestEvent.Set() End Sub End Class Public Class RequestQueue Private Shared _singleton As RequestQueue Public Shared ReadOnly Property Singleton() As RequestQueue Get If singleton Is Nothing Then _singleton = New RequestQueue End If Return _singleton End Get End Property ' a pool of prebuilt semaphores used with blocked requests. ' We support up to 500 concurrent requests. The value is arbitrary Private _semaphores(500) As ThreadSemaphore ' key is SequenceNumber, value is RequestSemaphore Private _blockedRequests As New Hashtable Public Sub New() For i As Integer = 0 To _semaphores.Length - 1 Dim semaphore As New ThreadSemaphore semaphore.requestEvent = New ManualResetEvent(False) _semaphores(i) = semaphore Next End Sub

The OPTIMIZER_MODE parameter dictates the type of optimization you want Oracle s query optimizer to follow. You can set the optimizer mode to the following values: all_rows: The query optimizer uses a cost-based approach for all SQL statements and optimizes with a goal of best throughput (minimum resource cost to complete the entire statement). first_rows_n: The query optimizer uses a cost-based approach and optimizes with a goal of best response time to return the first n rows (where n = 1, 10, 100, or 1000). first_rows: The query optimizer uses a mix of costs and heuristics to find the best plan for quickly returning the first few rows.

Example: OPTIMIZER_MODE = first_rows Default value: all_rows Parameter type: Dynamic. You can modify the value by issuing the ALTER SESSION or ALTER SYSTEM statement.