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Looking back at the execution plan, we see that the index line reports a cost of 184, and the table line reports a cost of 264, a difference of 80, which is what we get from the clustering portion of the formula This suggests that it is the bit involving the index leaf block factor that has gone wrong The cardinality on the index line of the 9i/10g plan gives us the clue the optimizer is telling us that it is going to examine 1,633 entries from the index, a huge fraction of the index Why is this Because as soon as we have a range scan on a column used somewhere in the middle of an index definition or fail to supply a test on such a column, the predicates on later columns don t restrict the selection of index leaf blocks that we have to examine.

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~R() { Console::WriteLine("destructor"); } }; class N { gcroot<R^> r_gcroot; auto_gcroot<R^> r_auto_gcroot; public: N() { r_gcroot = gcnew R(); r_gcroot->f(); r_auto_gcroot = gcnew R(); r_auto_gcroot->f(); } }; int main() { N n; // When n gets destroyed, the destructor for the auto_gcroot object // will be executed, but not the gcroot object. } The output of Listing 12-20 is as follows: managed member function managed member function destructor As you can see, the destructor was called only once, for the auto_gcroot object. Now, if we have a function that takes a handle to a managed object, we can pass in the gcroot or auto_gcroot handle instead. Both gcroot and auto_gcroot have implicit conversions to the underlying handles. They also both work with boxed value types.

This is why we have two selectivities in our formula, the effective table selectivity (which combines all predicates available on the index s columns) and the effective index selectivity (which may have to use a subset of the predicates based on the index s leading columns) In this case, the effective index selectivity has to be calculated from the predicate on just the n1 column Because the test on n1 is range-based, the predicates on index_pad and n2 do not restrict the number of index leaf blocks we have to walk Of course, when we finally get to examine an index leaf row, we can use all three predicates to check whether we should go to the table, so the effective table selectivity still includes all three individual column predicates So the effective index selectivity is 0.

As if your BlackBerry doesn t do enough for you, RIM was very thoughtful and included even more utilities and programs to help keep you organized and to help manage your busy life. Most of these additional programs will be found in the Applications folder. In this chapter we will show you how to use your BlackBerry as a calculator, a full functioning alarm clock, a voice note recorder and a password keeper.

1633333 (the selectivity we calculated previously for column n1), and the final cost formula is Cost = 2 + Ceiling(01633333 * 1,111) + Ceiling(00081667 * 9745) 184 + 80 = 264 ----blevel 182 80 as expected.

Calculator (HotKey U)

Also in 6, you saw one way to include a native object in a managed type. A somewhat cleaner way to include this is to use a template class that takes care of making sure that the native class gets cleaned up properly automatically when the enclosing class exits. Listing 12-21 defines a template reference type native_root that encapsulates the native pointer and can be

This result confirms a well-known guideline for arranging the columns in a multicolumn index. Columns that usually appear with range-based tests should generally appear later in the index than columns that usually appear with equality tests. Unfortunately, changing the column ordering in an index can have other contrary effects, which we will examine in 5.

9i introduced two very important columns to the plan_table for supporting explain plan. These are the filter_predicates and access_predicates, which tell you exactly how, and where, the optimizer thinks it is going to use the components of your where clause. If you are not making effective use of an index, the index line of an execution plan will highlight the problem very clearly. The access_predicates column will list the predicates being used to generate the start and stop keys for the index, but the filter_predicates column will list the predicates that cannot be used until the leaf blocks have been reached (in other words, the ones that should not be used in the calculation of the effective index selectivity).

There are many times when having a calculator nearby is handy. Gary usually likes to have his 15-year-old math genius daughter nearby when he has a math problem, but sometimes she s in school and not available to help.