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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..

Home Screen Preferences and Options (Download Folder, Layout, Wallpaper, Theme, Reset Icons)

Approximate cost (target 314) = 74 * 1.1 * 3 + 0.8 * 313 / 335 + 0.2 * 313 = 244.2 + 62.6 + 0.75 = 307.55

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.

On your BlackBerry, you can customize many things about your Home screen by pressing the Menu key from the Home screen and selecting Options (Figure 8-2).

(cheapest index, times three, scaled) (80% of the rows, packed at 335 rows per block) (20% of the rows, scattered into individual blocks) (An error of 2.1%)

Then you will see the Home screen Preferences screen. Glide the trackpad down to see all the settings options.

The strategy of always using the values from cheapest index looks to me like a bug, but it could be deliberate However, it does have some odd side effects When I used the dbms_statsset_index_stats procedure to change the number of leaf_blocks recorded for the hair_code index from 4,690 down to (exactly) 1,127, the optimizer decided to use it without needing a hint, and did a four-index bitmap and However, when I ran this modified test, the reported cost of using the fourth index to resolve the query was 336, whereas the reported cost of using the three indexes had previously been only 314 In other words, the optimizer had voluntarily selected an extra index despite the fact that this increased the cost of the query and the optimizer is always supposed to select the cheapest plan unless hinted otherwise.

Depending on your application, one or the other might make the most sense The assignment operator creates another reference to the same string This is what is meant by a shallow copy The Copy member function creates a new string, which is known as a deep copy Since String objects cannot be modified, multiple references to the string will retain the correct value; thus it is usually not necessary to copy the string However, to compare strings, you must be aware of whether you re comparing the reference (testing for reference equality) or the characters of the strings themselves The equality operator (==) is equivalent to the Equals method, and both test for equality of a string s value The example in Listing 5-1 demonstrates this Listing 5-1 Comparing Strings // string_equality.

Wallpaper: You can select any picture on your BlackBerry to set as your desktop background, or even click a picture with the camera. Layout: The Zen layout is the default where there are just a few icons on the bottom of the Home screen, which gives you a nice view of the background wallpaper. The Today layout gives you a preview of recent messages (E-mail), phone calls, and upcoming calendar events. See Figure 8-3 for both of these. Download Folder: Use Downloads as the default or change to any folder or even the Home folder. This can be convenient if you download a lot of apps and you want easy access to the icons from your Home screen.