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atoms[i]->DecayProcess = gcnew DecayProcessFunc(&RadioactiveAtom::SomeStaticMethod); So far we ve used delegates but not events An event is an abstraction representing something happening Methods called event handlers may be hooked up to events to respond in some way to the event Events are of type delegate, but as you ve seen, delegates themselves may be used independently of events The delegate forms a link between the source of the event (possibly a user action, or some action initiated by other code) and the object and function that responds in some way to the action In this case, the RadioactiveAtom class will have a Decay event, declared as in Listing 2-12 Listing 2-12 Declaring an Event ref class RadioactiveAtom { // other code.. // the event declaration event DecayProcessFunc^ Decay; }; Instead of invoking the delegate directly, we call the event in the client code using functioncall syntax.

but we can now consider the impact the feature can have even on very simple index-based execution plans. As far as indexes are concerned, the arithmetic is basically unchanged. As we saw in the earlier chapter, the critical features of CPU costing are the time component for multiblock I/Os and the CPU utilization. But typical indexed access is done in single-block I/Os so the time component is irrelevant, and the CPU utilization walking an index to locate and acquire a few rows from a table is usually relatively small. The big difference that appears when you enable CPU costing is that tablescans suddenly become more expensive. I ll demonstrate this with an example. To start, here s some code to create some system statistics (the code was specifically designed for 9i, but is valid on 10g, where there are a couple of other statistics): alter session set "_optimizer_cost_model" = cpu; begin dbms_stats.set_system_stats('CPUSPEED',350); dbms_stats.set_system_stats('MREADTIM',20); dbms_stats.set_system_stats('MBRC',8); dbms_stats.set_system_stats('SREADTIM',10); end; /

12. After the Configuration is set, go back to the main Synchronization screen and put a check mark in the Synchronize Automatically box if you want the Desktop Manager to automatically synchronize as soon as you connect your BlackBerry to your computer. 13. Close out all Sync setup windows to save your changes.

In this code fragment, we are telling the optimizer to assume that our CPU speed is 350MHz (or probably 350 million Oracle operations per second), that a multiblock I/O will take 20 milliseconds and will typically be fetching 8 blocks, whereas a single block I/O takes 10 milliseconds. The deliberate setting of the optimizer cost model to use CPU costing is to standardize the effect between 9i and 10g. The default value for this parameter is choose, and 9i will choose to use CPU costing only if the system statistics exist, but 10g will always choose to use CPU costing and then synthesize some statistics if there aren t any in place (and I can t get the delete_ system_stats call to drop the system statistics in 10g). If we then run the following query against our base data set, we can see the effects of CPU costing (see script btree_cost_05.sql in the online code suite): select small_vc from t1 where and and ; n1 = 2 ind_pad = rpad('x',40) n2 in (5,6,7)

In order to see the Advanced Sync setup screens, follow these steps: 1. 2. Go to the main synchronization screen as explained above. Click Advanced (see Figure 2-12).

The code that hooks up the event looks the same as with the delegate property (see Listing 2-13) Listing 2-13 Hooking Up and Firing an Event // Hook up the event atoms[i]->Decay += gcnew DecayProcessFunc(atoms[i], &RadioactiveAtom::BetaDecay); // .. // Fire the event a->Decay(); It is possible for an event to trigger multiple actions You ll learn about such possibilities in 7 You could certainly refine the design further Perhaps you are bothered by the fact that every instance of RadioactiveAtom contains its own halflife and lambda properties You might instead create a static data structure to store the half-life information for every type of isotope What would this structure look like It would require two indices to look up: both the atomic number and the isotope However, a two-dimensional array would be a huge waste of space, since most of the cells would never be used.

In my test script, I ran the query with an index() hint, a full() hint, and unhinted. The costs behaved as shown in Table 4-2.

After clicking Advanced, you will see a screen similar to the one in Figure 2-13.

Cost with System Statistics 9i / (10g)