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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

If you examine script btree_cost_02sql closely, you will see that it calls a copy of my hack_statssql script, which has been set to change the value of user_indexesnum_rows for the critical index Originally I had done this to check whether Oracle used the value of num_rows stored in user_tables or user_indexes when working with the less common uses of indexes In 8i and 9i, the reported cardinalities did not change when I made this change, but in 10104, I got the following results from the preceding query when I changed the num_rows value in user_indexes to 11,000 and 9,900 respectively: Execution Plan (10104, autotrace user_indexesnum_rows = 11,000) --------------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=264 Card=1 Bytes=58) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (TABLE) (Cost=264 Card=1 Bytes=58) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (INDEX) (Cost=184 Card=1797) Execution Plan (10.

Click Next to see an advanced screen with more options. This shows options for the Calendar. Address Book, Tasks, and MemoPad may have different options. We recommend settings as shown below to ensure you never miss out on any data you enter on your BlackBerry (if you forget to sync every day). These settings will sync calendar events up to 30 days old from your BlackBerry and 180 days into the future (see Figure 2-10).

104, autotrace user_indexesnum_rows = 9,900) -------------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=93 Card=1 Bytes=58) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (TABLE) (Cost=93 Card=1 Bytes=58) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (INDEX) (Cost=12 Card=82) In the case where I have boosted the value of num_rows from 10,000 to 11,000, the cardinality on the index line has gone up from 1,633 to 1,797 the optimizer seems to have used user_indexesnum_rows to calculate the cardinality of this line (1,797 = 1,633 * 11,000 / 10,000) Slightly surprising, but perfectly rational, and the cost of the query has not changed significantly, so quite a safe step But look what has happened when I artificially lowered the value of user_indexes num_rows the cost of the index line drops from its original 184 down to 12, and the cardinality drops from 1,633 to 82.

10. Repeat the procedure for all the apps you want synced. Click Next and click Finish on the next screen. You will see similar screens for all four apps with some minor variations (see Figure 2-11).

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

The change in cardinality is no big deal, as the error is self-correcting by the time we reach the table but the dramatic drop in cost echoes on through the plan Basically, the arithmetic has simply dropped the cost of the leaf block scan (possibly through a simple numerical error: trunc(9,000 / 10,000) = 0) Of course, it isn t completely safe to draw absolutely firm conclusions from hacked statistics, so script btree_cost_02asql in the online code suite repeats the final test of btree_cost_02sql, but includes one extra line in setting up the data: update t1 set n1 = ind_pad = n2 = where rownum <= ;.