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You will now see the Switch Application popup window, which shows you the icon for every application that is currently running. If you see the icon for the program you want to switch to, just glide to and click it. If you don t see the icon you want, then click the Home screen icon. From here, you can locate and click the right icon. You can then jump back to the MemoPad or the application you just left by selecting the Switch Application menu item from the program you jumped to (see Figure 17-2).

To explore versioning issues, suppose a client of this game library has a Scroll class (see Listing 8-2) representing magic spells written out on a scroll This class supports a Read method that invokes a spell: Listing 8-2 A Class for Magic Spells // client_gamecpp #using "game_librarydll" ref class Scroll : Item { public: void Read() { /* read the scroll and invoke the spell */ } }; Let s say that we are shipping a new version of our library, and we add functionality to read and write GameObject instances from a file So we add Read and Write methods, as in Listing 8-3 Listing 8-3.

Notice how the Area size: is set to just 1MB. This seems to be a hard limit set by parameter _smm_min_size even though the run-time engine will happily take much more memory. But it is this limit that introduces a boundary condition on the costing of the sort so the optimizer will not cost this sort as an in-memory sort as it needs a minimum 300,000 * 16 bytes = 4.6MB, which is larger than the _smm_min_size. In this example, I had to restrict the number of rows in my query to just 65,536 before the optimizer would cost the sort as an in-memory sort (at which point the IO cost per sort dropped to zero). The fact that the I/O component of the sort cost can drop to zero for this configuration of pga_aggregate_target and CPU costing is, of course, a good thing because it is reasonably representative of real life. This is definitely a plus point for CPU costing if you are running an OLTP system, as you are likely to find that SQL operating in the scale of the small report is probably going to fall into the range of calculated and actual optimal sorting. The fact that the I/O component of cost drops to 0 only when the estimated volume of data falls below such an extreme limit is not such a good thing and may encourage people to start tweaking hidden parameters in the hope of making the optimizer behave a little more sensibly. I believe that the strategic option is to enable CPU costing, and take advantage of the automatic workarea_size_policy. But I do think you are likely to have problems in transition, and

3. 4.

need to do a thorough regression test. As a starting guess for the pga_aggregate_target, the best figure for minimal changes to current execution plans may be about 100 times your current setting of sort_area_size (rather than the 20 times implied by the known 5% limit that applies to run-time sizing of work areas). I would, however, advise you to consider using session-based code to switch to manual work area sizing and explicit values for the sort_area_size for critical batch-like tasks. In many cases, the changes in costs for sorting are likely to leave execution plans unchanged because most uses of sorting are due to order by, group by, or distinct, which have to be done whatever the cost (though watch out for the hashing options for group by and distinct that 10gR2 brings). There will be cases though where paths may change dramatically, perhaps swapping from merge to hash or hash to merge, because of a sharp (and unreasonable) change in cost. You may also find cases where subquery unnesting, or complex view merging, suddenly does (or does not) happen the way it used to because of a change in the cost of a distinct requirement that wasn t even directly visible in your SQL.

TIP: Pressing and holding the Alt key and then tapping the Escape key is the shortcut to bring up the Switch Application popup window. You can also just press and hold the Menu key to activate the popup window.