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The cost of the bitmap query has gone up by 14, the cost of the B-tree query has gone up by just 1 Of course, we know that the B-tree query cost has been calculated on the basis of visiting about 45 table blocks, compared to the bitmap query cost that is based on visiting about 100 table blocks but what Oracle actually does by the time it gets to the table is the same irrespective of whether it got there from a B-tree or a bitmap index So most of the difference in cost must come from the bitmap somehow .. or so we assume! And this is where (a) autotrace really shows up its deficiencies, and (b) we get a nasty surprise If we do a proper explain plan, we get separate io_cost and cpu_cost columns (we could also look at the 10053 trace for even finer detail).

Strings implement IComparable, so they support the CompareTo method to compare to another string. You can also use the static method, Compare, to compare two strings. The version of the Compare static method that takes only two strings as parameters and the CompareTo method use the same comparison algorithm, but the Compare static method is overloaded and has several variations that allow the comparison to be customized. The CompareTo method, for any object that implements IComparable, returns a value representing one of three possibilities. A negative return value indicates that the first object is less than the second. A zero return value indicates that the two objects are equal. A positive return value indicates that the first object is greater than the second. For the CompareTo method, the first object is the object whose instance method is being called; for the static method, the first object is the first argument. Listing 5-5 shows the basic use of string comparison. Listing 5-5. Comparing Strings with CompareTo // string_compare.cpp using namespace System; int main() { String^ str1 = "cat"; String^ str2 = "cab"; if (str1->CompareTo( str2 ) < 0) { Console::WriteLine(str1 + " is less than " + str2); } // For variety, use the static method. else if ( String::Compare(str1, str2) > 0 ) { Console::WriteLine("{0} is less than {1}", str2, str1); }

Don t worry, your BlackBerry will still ring or vibrate to notify you of an incoming phone call when it is in standby mode. What s the difference between the two options You will notice a difference if you have your password security enabled (page 528). Pressing the Lock key will force you to enter your password to unlock it. Pressing the Mute key (standby mode) will not force you to enter your password (unless the security timeout has elapsed). The other difference, according to some blogs, is that standby mode is supposed to save your battery more than the keyboard lock mode.

The B-tree cost of 55 comes from io_cost = 54, cpu_cost component = 1 (cpu_cost = 577,401) The bitmap cost of 128 comes from io_cost = 127, cpu_cost component = 1 (cpu_cost = 1,063,986) Two things stand out in these figures: first, the actual CPU cost has roughly doubled, which corresponds roughly to the factor of 2 in the estimated number of I/Os (from 54 to 114) the work involved in acquiring the right to access a buffered block is CPU-intensive But the CPU required to handle the bitmap expansion is apparently not considered to be dramatically different from the CPU required to binary chop through an index block..

The two keys on the middle of the sides of your BlackBerry are actually programmable keys called Convenience keys (Figure 8-6). This is because each of the two keys can be