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C++/CLI supports, for convenience, the use of the + operator on strings, string literals, and other entities that can be converted to strings (which includes any managed type, since Object defined the ToString method that other objects inherit). The result is the concatenation of the strings. In this way you can build up an output string using concatenation, rather than using the format string. This is not generally a good idea for applications that must be localized into other languages, since the different word order of different languages may mean that the order of concatenation is language dependent. Listing 5-4 shows the use of the string concatenation operator. Listing 5-4. Concatenating Strings // string_operator_plus.cpp using namespace System; int main() { String ^hrs = "Hours", ^mins = "Minutes"; wchar_t separator = ':'; int minutes = 56, hours = 1; Console::WriteLine( hrs + separator + " " + hours + "\n" + mins + separator + " " + minutes); }

Take the picture. (Learn all the details about the camera on page 22.) Click the Crop icon as shown and select Set as Home Screen Image.

Any discussion of bitmap index costing would be incomplete without some notes on what happens when you invoke CPU costing. Given that CPU costing is a strategic feature, it s a good idea to be prepared for the day when you have to make the change. And if you had to guess, you might assume that CPU costing will have more impact on execution plans using bitmap indexes (and the B-tree to bitmap conversion) because of the work that must be done to convert between bits and rowids. We ll use the same system statistics as we did in the 4 (see script bitmap_cost_05.sql in the online code suite): alter session set "_optimizer_cost_model" = cpu; begin dbms_stats.set_system_stats('MBRC',8); dbms_stats.set_system_stats('MREADTIM',20); dbms_stats.set_system_stats('SREADTIM',10); dbms_stats.set_system_stats('CPUSPEED',350); end; / alter system flush shared_pool; With these figures in place, we can run a couple of the queries that we used earlier on in the chapter against our original data set, and see how things change. Here, for example, are the execution plans against column n4 (clustered data, 25 different values, bitmap index) and n6 (clustered data, 25 different values, B-tree index), with their original cost, and with CPU costing all plans are from 9.2.0.6:

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The output of Listing 5-4 is as follows: Hours: 1 Minutes: 56 The addition operator works from left to right, so as long as the first operand is a string, each operand in the series will be converted to a string, even if some part of the expression could also be interpreted as another type of addition (such as adding integers). The ToString function is used to convert types to strings. The string concatenation operator works with all managed types, since all managed types inherit the ToString operator from System::Object. Strings that are editable (also called mutable) should be instances of StringBuilder rather than String. You ll learn more about StringBuilder strings later in this chapter.

Have you ever needed to put your BlackBerry into your pocket, purse, or bag and don t want keys to be accidentally pressed If yes, then you can use either the Keyboard Lock key or the Mute key to lock the keyboard. Standby Mode (On/Off): Just press and hold the Mute/Play key on the top of your BlackBerry until you see the Entering Standby message. To exit standby mode, just tap the Mute key again (Figure 8-5).

Execution Plan - bitmap index on clustered column ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=114 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=114 Card=400 Bytes=5600) 2 1 BITMAP CONVERSION (TO ROWIDS) 3 2 BITMAP INDEX (SINGLE VALUE) OF 'T1_I4' Execution Plan - bitmap index on scattered column with CPU costing -----------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=128 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=128 Card=400 Bytes=5600) 2 1 BITMAP CONVERSION (TO ROWIDS) 3 2 BITMAP INDEX (SINGLE VALUE) OF 'T1_I4' Execution Plan - B-tree index on clustered column ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=54 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=54 Card=400 Bytes=5600) 2 1 INDEX (RANGE SCAN) OF 'T1_I6' (NON-UNIQUE) (Cost=9 Card=400) Execution Plan - B-tree index on clustered column with CPU costing -----------------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=55 Card=400 Bytes=5600) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=55 Card=400 Bytes=5600) 2 1 INDEX (RANGE SCAN) OF 'T1_I6' (NON-UNIQUE) (Cost=10 Card=400) It looks as if our prediction is correct.

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