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This line changes the data so that there are 100 rows in the table that do not appear in the index. This has virtually no effect on the costs and cardinalities of the plans produced in 8i and 9i, but again, when we get to 10g, we get a nasty surprise the results we got from hacking the

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Listing 2-11 demonstrates creating a delegate type, in this case DecayProcessFunc. The RadioactiveAtoms class has a property named DecayProcess, which is of that delegate type. This property can be set to the beta decay function (here beta minus decay), the alpha decay function, or perhaps some other rare type of radioactive decay. The delegate indicates both the object and the method. This is the main difference between a delegate and a pointer to member function in classic C++. Listing 2-11 provides the full code, with the delegate code highlighted. I ve removed the interface that was used in Listing 2-8, as it is not central to the discussion now. Listing 2-11. Using a Delegate // radioactive_decay.cpp using namespace System; // This declares a delegate type that takes no parameters. delegate void DecayProcessFunc(); enum class Element; // same as before ref class Atom; // same as before, but without the position data

statistics still appear when the data is genuine. This is the execution plan for the last query with the (slightly) modified data I ve included the equivalent plan from 9.2.0.6 for comparative purposes: Execution Plan (10.1.0.4, autotrace 100 completely null entries) -----------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=90 Card=1 Bytes=58) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (TABLE) (Cost=90 Card=1 Bytes=58) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (INDEX) (Cost=11 Card=80) Execution Plan (9.2.0.6, autotrace 100 completely null entries) ----------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=260 Card=1 Bytes=58) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=260 Card=1 Bytes=58) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=182 Card=1633) Tracking this down into the 10053 trace file, we find the following critical details (note that the entry labelled ix_sel_with_filters used to be called the tb_sel in earlier versions of Oracle): With no null entries: ix_sel: 1.6333e-001 With 100 null entries ix_sel: 8.0850e-003 ix_sel_with_filters: 8.1667e-003

NOTE: If the Synchronization button is grayed out and not clickable, please make sure your BlackBerry is connected to your computer. If you see None instead of your PIN number in the lower left corner, your BlackBerry is not connected to your computer. You will see the main IntelliSync Program window (see Figure 2-7).

ix_sel_with_filters:

To get started, check the box next to the icon you want to sync or on the name of the icon. You can also click the check box and click the Setup button at the bottom. For example, clicking Calendar and Setup will bring you to a few screens with details for how to sync your computer s calendar to your BlackBerry. Select your Desktop app from the list (see Figure 2-8) and click Next.

ref class RadioactiveAtom : Atom { public: RadioactiveAtom(int a, int n, bool is_stable, double half_life) : Atom(a, n) { IsStable = is_stable; HalfLife = half_life; Lambda = Math::Log(2) / half_life; } // The atom releases an alpha particle // so it loses two protons and two neutrons. virtual void AlphaDecay() { AtomicNumber -= 2; IsotopeNumber -= 4; Update(); } // The atom releases an electron. void BetaDecay() { AtomicNumber++; Update(); } property bool IsStable; property double HalfLife; property double Lambda; void Update() { // In this case we assume it decays to a stable nucleus. // nullptr is the C++/CLI way to refer to an unassigned handle. DecayProcess = nullptr; IsStable = true; } // Declare the delegate property. We'll call this when // an atom decays. property DecayProcessFunc^ DecayProcess; }; // ref class RadioactiveAtom

8.0850e-003

You will see options for Two way or One-way sync. The Two way sync means any changes you make on your computer or BlackBerry will be synchronized to the other device (Two way sync is typically more desirable). Under special circumstances, you might require or want One-way sync see Figure 2-9.