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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 MINUS 5 4 BITMAP INDEX (SINGLE VALUE) OF 'T1_I3' 6 4 BITMAP INDEX (SINGLE VALUE) OF 'T1_I1' 7 3 BITMAP INDEX (SINGLE VALUE) OF 'T1_I1 Note, especially, the occurrence of two bitmap minus operations in the second plan. There are two of them because bitmap indexes include entries for completely null keys.

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Listing 5-2. Converting a String to a Character Array // string_tochararray.cpp using namespace System; int main() { String^ str = "A quick sly fox jumped over the lazy brown dog."; array<Char>^ character_array = str->ToCharArray(); // Print the original string. Console::WriteLine( str); // Modify characters in the character array. for (int i = 0; i < character_array->Length; i++) { if ( character_array[i] >= L'a' && character_array[i] <= 'z') { character_array[i] -= (L'a' - L'A'); } } // Convert back to a String using the String constructor // that takes a Unicode character array. str = gcnew String(character_array); // Print the modified string: // A QUICK SLY FOX JUMPED OVER THE LAZY BROWN DOG. Console::WriteLine( str); } The output of Listing 5-2 is shown here: A quick sly fox jumped over the lazy brown dog. A QUICK SLY FOX JUMPED OVER THE LAZY BROWN DOG. Or, if you need to iterate over characters in a string, use the for each statement, as in Listing 5-3. Listing 5-3. Looping Through a String // string_foreach.cpp using namespace System;

To perform a bitmap minus, Oracle takes the second bitmap and negates it changing ones to zeros, and zeros to ones. The bitmap minus operation can then be performed as a bitmap and using this negated bitmap.

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If we have declared n1 to be not null, Oracle can resolve the query by finding the bitmap for the predicate n1 = 2, negating it, and then using the result in a bitmap and with the bitmap for n3 = 2, giving the first execution plan If we have not declared n1 as not null, then the bitmap we get from the first step will include bits for rows where n1 is null so Oracle has to acquire the bitmap for n1 is null, negate it, and perform a further bitmap and with the intermediate result This extra step will require some work at run time So if you know that a column is never supposed to be null, here is another reason for including that little bit of information in the table definition.

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int main() { String^ str1 = "Ode on a Grecian Urn"; for each (Char ch in str1) { Console::Write(ch); } Console::WriteLine(); } Here s the output of Listing 5-3:

You will notice that I have not reported the costs in the execution plans this was a deliberate omission designed to avoid confusion 8i behaves quite reasonably and costs the first plan (with a single bitmap minus step) as cheaper than the second plan (with two bitmap minus steps) Unfortunately, 9i and 10g both seemed to think that doing a second bitmap minus step would make the query significantly cheaper than doing just the one bitmap minus step This could be a reasonable assumption, but for the fact that the statistics indicate that there were no rows with a null for the relevant column, so there would be little chance of reducing the number of visits to the table Again, we seem to have some circumstances where the algorithms for bitmap costing are not entirely correct There are other problems with null values and bitmap indexes.