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BlackBerry Messenger offers you a little more secure way of keeping in touch quickly with fellow BlackBerry users. Setting it up is very easy. If you don t see the BlackBerry Messenger icon, then press the Menu key (to the left of the Trackpad) and glide up or down to find its icon. Follow these steps to set up the program: 1. Click the BlackBerry Messenger icon. You will be prompted to set your User Name.

Various reasons for sorting Demonstration of 9i on sorting on multiple columns Examples of merge joins Examples of union, intersect, and minus Shows how the optimizer fails to cost a new run-time trick Sets a standardized environment for SQL*Plus

Type in your User Name and click OK. You will then be asked to set a BlackBerry Messenger password. Type in and confirm your password, and then click OK.

virtual void f_virt() { System::Console::WriteLine("ManagedBase::f_virt"); } }; ref class ManagedDerived : ManagedBase { public: ManagedDerived() { f_virt(); } virtual void f_virt() override { System::Console::WriteLine("ManagedDerived::f_virt"); } }; int main() { NativeDerived nd; ManagedDerived rd; } The output of Listing 8-15 is as follows: NativeBase::f_virt NativeDerived::f_virt ManagedDerived::f_virt ManagedDerived::f_virt Surprised For CLI types, virtual function dispatch is always deep, meaning that the most derived override is always called. In classic C++, it is shallow in the constructor, but deep everywhere else. In fact, you ve arrived at the explanation of the difference in constructor initialization order as well. Because the most derived virtual function gets called, functions can execute on objects that have not been fully constructed. Having the fields get initialized first at least means that fields will be valid objects when derived class virtual functions get called, although you still need to take care in calling virtual functions in constructors, and also when implementing virtual functions that are called by base class constructors, to remember that objects are in a partially constructed state. To override this behavior, specify the fully scoped base class function, like this:

t would be impossible to write a good book on the cost based optimizer without mentioning the optimizer debug trace event: 10053. It is well known that the 10053 trace file can tell you a lot about what the optimizer is doing to calculate the cardinalities and costs involved in evaluating an execution plan. The information is never complete, and there are all sorts of oddities that might exist in such a trace file. But, for your entertainment, this chapter walks through the 10053 trace from a simple four-table join run under 10gR1, describing some of the features that it exposes. To enable the 10053 trace, you need to issue one of these statements: alter session set events '10053 trace name context forever'; alter session set events '10053 trace name context forever, level 1'; alter session set events '10053 trace name context forever, level 2'; The first two do exactly the same thing the last option produces a slightly shorter trace file because it doesn t include the optimizer parameter listing that is normally at the start of the trace file. To stop tracing, issue alter session set events '10053 trace name context off'; You will find that the 10053 trace does not work on SQL embedded in PL/SQL unless you are running 10g. The visual impact of this chapter had to be totally different from the rest of the book. The original trace file is reprinted in the code format, and there is a lot of it. To allow the eye a break, I have included subheadings at each new join order. Note that I put the comments before the text that I am commenting on, although there are a couple of notes that have to refer backwards as well as forwards.

4. 5.

Note Inevitably, 10gR2 does things differently. The order of the sections is different, there are numerous extra hints clues and explanations (including a list of descriptions for all the little abbreviations like CDN), the system statistics are reported, and the final execution plan with predicates and outline is included.