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Several views in an Oracle database show statistics at the systemwide level and the session level. These views typically show the accumulated values since the database was last brought online. For the statistics to add value for analysis, there must be two samplings of the statistics with a known duration of time between the samplings. The difference between the ending values and the starting values is commonly known as the delta values. Likely the most commonly accessed systemwide views showing statistics are the V$SYSSTAT view and its related session-level view V$SESSTAT. Views such as V$SESS_IO show a subset of the statistics found in V$SESSTAT, primarily including logical and physical block reads and block changes. Statistics in the V$SYSSTAT view typically fall into one or two categories, or classes, of statistics from the following list (the number appearing in parentheses is the numeric representation of the class): user (1), redo (2), enqueue (4), cache (8), OS (16), RAC (32), SQL (64), and debug (128). If a statistic falls into multiple classes, the value assigned to the CLASS column is the sum of the values associated with each class type (BITAND(CLASS,1)>0 locates all of those statistics belonging to the user class as well as those that belong to both the user class and the RAC class). The statistics indicating elapsed time (DB time, parse time cpu, parse time elapsed, redo synch time, redo write time, and so forth) are indicated in centiseconds, meaning that the indicated times need to be divided by 100 to obtain the elapsed seconds. V$SYS_TIME_MODEL, introduced in Oracle 10.1, and its associated session-level view V$SESS_TIME_MODEL show the amount of time and CPU usage at the system level and session level, respectively, that were utilized for tasks such as hard parsing, sequence maintenance, PL/SQL execution, and so forth. The time indicated must be divided by 1,000,000 to obtain the elapsed seconds. To be properly understood, the statistics in these views should be manually rearranged in a tree structure similar to the following: SQL> SELECT 2 VALUE, 3 STAT_NAME 4 FROM 5 V$SYS_TIME_MODEL; VALUE -------------284,815,279 34,678,994 12,702,393,076 7,800,938,927 674,299 97,139 12,757,866,016 595,228,023 582,948,813 STAT_NAME -------------------------------------------------background elapsed time background cpu time DB time DB CPU connection management call elapsed time sequence load elapsed time sql execute elapsed time parse time elapsed hard parse elapsed time
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There are ten overloaded versions of the WriteEntry method. I have used the most complete version in Listing 36-3, which takes parameters for the event source, a message to describe the event, the type of the event, a program-specific event code and category, and a byte array for any supporting data that should be logged. Notice that I don t have to specify which of the event logs the event should be written to. This is because the association between the event source and the event log was made in Listing 36-2 when I created the event source, and any event written using the C# Intro Source event source will be written to the Application log. Compiling and running Listing 36-3 places a new event in the Application event log. The following is copied from the XML view of the Windows Event Viewer tool: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="C# Intro Source" /> <EventID Qualifiers="0">0</EventID> <Level>4</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2010-08-30T13:30:16.000000000Z" /> <EventRecordID>8302</EventRecordID> <Channel>Application</Channel> <Computer>Shuttle</Computer> <Security /> </System> <EventData> <Data>This is a test event</Data> <Binary>4865726520697320736F6D652064617461</Binary> </EventData> </Event>
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CHAPTER 6 s OBJECT-ORIENTED APPLICATION DESIGN
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class Program { static void Main() { // Create arrays of various types. int[] IntArray = new int[] { 3, 5, 7, 9, 11 }; string[] StringArray = new string[] { "first", "second", "third" }; double[] DoubleArray = new double[] { 3.567, 7.891, 2.345 }; Trivial.ReverseAndPrint<int>(IntArray); Trivial.ReverseAndPrint(IntArray); Trivial.ReverseAndPrint<string>(StringArray); Trivial.ReverseAndPrint(StringArray); Trivial.ReverseAndPrint<double>(DoubleArray); Trivial.ReverseAndPrint(DoubleArray); } } // Invoke method // Infer type and invoke // Invoke method // Infer type and invoke // Invoke method // Infer type and invoke
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Typically, C++ classes that use limited resources, such as operating system device contexts, database connections, files, and so on, are implemented using an idiom called RAII (Resource Acquisition Is Initialization). RAII specifies that acquiring resources is to be done in a constructor. Having adopted such a pattern, the class design will have to deal with properly freeing these resources in a prompt and predictable manner to ensure an application s best behavior and performance. Native C++ programs use the destructor for this, and they can be assured that whenever a block or stack frame is completed, temporary objects created on the stack will be released, their destructors called, and any limited resources freed. Such assurances of prompt freeing of resources are, at first glance, not available in the managed environment, when the object isn t really cleaned up until the garbage collector runs. The CLI provides the Dispose method (and the interface IDisposable, which defines this one method) to solve this problem. The Dispose method is never called directly from C++/CLI code, as for example, you might in C# code. If you re a C# programmer, you ll want to pay close attention to the information in this section since it differs markedly from the C# behavior. In C#, you might call Dispose directly, or you might use the using statement to create a scope for your object, and have the Dispose method called automatically at the end of that scope. Instead, C++/CLI provides a more familiar (to classic C++ programmers) way to use the RAII model. You implement a destructor much as you would in classic C++. Implementing a destructor causes the object to implicitly implement IDisposable. The destructor, in fact, becomes the Dispose method and hence implements the interface. In C++/CLI, if you define a destructor as usual, you can be assured that your object s destructor will be called when the object goes out of scope as a result of the stack going out of scope or the destruction of the enclosing object, or an explicit call to delete on a handle to the object. delete is used to call the destructor for a handle object, so use delete if you need to call the destructor, but aren t using stack semantics. (There is no such thing as gcdelete; the delete operator is able to serve for both native pointers and managed handles, since the appropriate form may be determined from the entity being deleted.) The destructor is not called when the garbage collector cleans up the object, so if you do not call delete for your handle, the destructor won t get called at all.
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panel, as I have done in Figure 6-80.
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As I mentioned in 7, the nongeneric type metadata is grouped around the concepts of type definition (TypeDef) and type reference (TypeRef). The generic type metadata uses one more basic concept type specification (TypeSpec), representing the instantiations of generic types. The definition of a nongeneric type involves the following information: The full name of the type being defined Flags indicating special features the type should have The type from which this type is derived The interfaces this type implements How the loader should lay out objects of this type in memory Whether this type is nested in another type and if so, in which one Where fields and methods of this type (if any) can be found To define a generic type, you should also supply the list of type parameters and define the constraints of each type parameter. Referencing a generic type is a tricky question. Strictly speaking, you cannot reference a generic type per se; you can reference only an instantiation of a generic type, providing in addition to the type s name and resolution scope the list of type arguments. Saving you a trip four chapters back, I m repeating the figure here that shows the metadata tables participating in type definition and referencing (see Figure 11-1). The arrows indicate cross-table referencing by means of metadata tokens.
Item Keys
CHAPTER 15 DATA LOADING AND UNLOADING
Note Interfaces in the sense of encapsulation is slightly different from the C# language feature also called interfaces. See 12 for details of the language feature.
Figure 3-15. The RichTextBox control example Here s the corresponding XAML: <RichTextBox TextWrapping="Wrap" IsReadOnly="False"> <Paragraph> This is Paragraph 1. </Paragraph> <Paragraph FontSize="16" TextAlignment="Right" FontFamily="Courier New"> <Underline> This is right aligned formatted paragraph <LineBreak/> Second formatted line </Underline> </Paragraph> <Paragraph> This is inline image.. <InlineUIContainer> <Image Source="res/5.jpg" Height="150" Width="200" Stretch="UniformToFill"/> </InlineUIContainer> </Paragraph> <Paragraph> <LineBreak/> Inserting Grid Panel to the RichTextBox <LineBreak/> <InlineUIContainer> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions>
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