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You can customize your BlackBerry and make it look truly unique. One way to do this is to change the theme or look and feel of your BlackBerry. Changing themes usually changes the layout and appearance of your icons, and the font type and size you see inside each icon. There are several different themes already included on your BlackBerry, and literally dozens more available for download at various web sites or App World (learn how on page 181.) Carrier-Specific Themes: Depending on your BlackBerry wireless carrier (phone company) you may see various customized themes that are not shown in this book. More Standard/Generic BlackBerry Themes: Most of the standard themes shown here are pre-installed on every BlackBerry. Glide and click the Option icon on your BlackBerry. You may have to press the Menu key to see all your icons, and then locate the Options icon. Or if you have Home screen hotkeys enabled, just tap the letter O (see page 548).

If you work out the average number of rows identified by just the town_code, age_code, and work_code specified in the preceding example, you will see that the optimizer will decide that these three columns are sufficient to restrict table visits to 36,000,000 / (31 * 47 * 79) = 313 rows So with the worst possible scattering of data (rather than the assumed 80/20 split), the work needed to acquire these rows would be 313 table block visits Even if the next best index (hair_code with seven distinct values) reduced the number of table visits from a worst-case 313 down to 0, it wouldn t be worth using the index because it would require visiting an extra 672 index blocks far more than the number of table block visits that would be saved.

TIP: Press the letter T to jump right down to the first entry starting with T. which should be Theme.

Because of the context-dependent nature of string literals, it is sometimes said that the type of a string literal is inexpressible in the language In practical terms, it simply means that you can use string literals without a lot of fussing about the types involved To concatenate two strings, use the static method String::Concat, as follows: String^ str = String::Concat(str1, str2); What this does is create a new String object, str, that is the concatenation of str1 and str2 The str1 and str2 objects themselves are left unmodified To get at a single character in a string, use the Chars indexed property, as follows: char c = str1->Chars[5]; You ll read more about indexed properties in 7; the indexed property Chars allows array-indexing syntax to be used on the property To copy a string, you can either make another reference to the same string or copy the string.

As a rough test, I used the dbms_stats package to modify the leaf_block count for the hair_code index, and I had to bring it down to exactly 1,127 blocks so that leaf_blocks / distinct_keys was down to 161 before the optimizer considered it worthwhile using it (If the table had been sorted on hair_code to start with, the index would have held 675 leaf blocks rather than 4,690 leaf blocks, so the test was a reasonable one) Given the time it took to build the data, hacking the statistics with the dbms_stats package (see script hack_statssql in the online code source) a couple of dozen times to find the break point seemed a reasonable idea Although it conveniently showed how the optimizer is very cunning in making its choice of bitmap indexes, this example also highlighted more deficiencies in my approximation of the costing algorithm.

10. Inside the Theme screen, just glide and click the theme you want to make active. Your currently selected theme is shown with the word Active next to it.

The optimizer chose just the three indexes mentioned and reported the total cost of the query as 314; but if you check the sum of (blevel + leaf_blocks * effective index selectivity) for those indexes it comes to 352 (164 + 114 + 74) The final cost is less than the sum of its parts and that s before you multiply by the 11 scaling factor and add on the cost of visiting the table! It took me some time to spot what was going on, but when I used the dbms_stats package to modify the blevel of one of the used indexes, the change in cost was out of proportion to the change I had made to the blevel This led me to decide that the final reported cost ignored the statistics of two of the indexes, and used the values from the cheapest index three times..