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Console::WriteLine(" str1 ReferenceEquals str2"); } if (String::ReferenceEquals(str1, str3)) { Console::WriteLine(" str1 ReferenceEquals str3"); } } The output of Listing 5-1 is as follows: str1 str1 str1 str1 str1 str1 == str2 == str3 Equals str2 Equals str3 ReferenceEquals str2 ReferenceEquals str3

Of course, there could be a rationale for making this choice and this may be embedded in some part of the calculation that I haven t worked out yet. Bitmap indexes tend to be very small compared to the table they index; for example, my biggest index is less than 6,000 blocks on a table of more than 100,000 blocks. You may have enough memory to cache all your critical bitmap indexes. In those circumstances, it might make sense for the optimizer to trade a large number of logical I/Os on bitmap indexes against a small number of physical I/Os against the table. In my test case, the increase from 2,285 logical I/Os to 2,607 logical I/Os would have allowed Oracle to decrease the number of table block visits from 16 to 8. That extra 320 logical I/Os doesn t seem such a bad deal against a reduction in 8 physical I/Os. There was one other change in behavior that appeared from the big test case the reported cost of the query did not change much as I altered db_file_multiblock_read_count. Perhaps this is because the effect is very small once the data sets get large. Perhaps the error introduced by the (possible) bug in the handling of multiple indexes is so significant that the (possible) bug relating to db_file_multiblock_read_count is hidden. Perhaps it s because there is some special code for small data sets. In any case, it was nice to discover that for large data sets (which is where you tend to use bitmap indexes used, anyway), the calculations seem to be a little more stable than they are for smaller data sets.

Precision Zen Theme: Icons This them has full-color icons with a limited set of five shown on the main Home screen. They look very similar it is fairly hard to tell the difference between these two themes. The Zen theme has some slight color to the icons.

It is always important to tell Oracle as much about your data as possible not null columns are particularly important, as they can make a big difference to the possibilities open to the optimizer. Bitmap indexes are a good case in point. Consider the following query, based on the original sample data set, and note the not equal of the first condition (this is an extract from the script bitmap_cost_04.sql in the online code suite): select small_vc from t1 where and ; n1 != 2 n3 = 2

Figure 8-4 shows some examples of dozens of new themes that you can download from App World on your BlackBerry.

To get the string as an array of characters, you can convert it to a character array using the ToCharArray method, as shown in Listing 5-2. Unlike the Chars property, this creates a new array of System::Char that contains a copy of each character in the string. System::Char is also known as wchar_t, the Unicode character type.

Depending on the exact details of the table definition, you would find that there are two possible execution plans for this query: Execution Plan (9.2.0.6) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' 2 1 BITMAP CONVERSION (TO ROWIDS) 3 2 BITMAP MINUS 4 3 BITMAP INDEX (SINGLE VALUE) OF 'T1_I3' 5 3 BITMAP INDEX (SINGLE VALUE) OF 'T1_I1' and

The one on the left is Sky2 PrimeTheme, from DreamTheme, and the one on the right is Animated Winter Wonderland, from Motek Americas Inc., which is animated so the snowflakes actually fall on the Home screen. Some of the themes are animated so that there is some movement (e.g., the wind blows the leaves of a palm tree and there are waves moving in the ocean). Themes range from free to about US $9.99, with many in the $4.99 to $6.99 range. NOTE: If you need help getting started with BlackBerry App World, check out our chapter starting on page 441.