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Execution Plan (8.1.7.4) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=264 Card=82 Bytes=4756) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=264 Card=82 Bytes=4756) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=184 Card=82) Execution Plan (9.2.0.6 and 10.1.0.4) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=264 Card=82 Bytes=4756) 1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=264 Card=82 Bytes=4756) 2 1 INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=184 Card=1633) The alter session command is there for the benefit of 9i and 10g. The unhinted execution plan was a full tablescan, but when I first put in an index hint, the optimizer insisted on using the index skip scan mechanism, and in 10g if I then included the no_index_ss() hint, the index was disabled and the plan went back to a tablescan (I would be inclined to call this behavior a bug it seems perfectly reasonable to me to say, Use this index, but don t do a skip scan, but it is possible that it s the specified behavior). An important point to note is that the cardinality of this execution plan matches what we saw in the previous query (82), but the cost is very much greater (264 instead of 93). Let s try to use the formula in the standard way, and see what happens. The selectivity for column n1 is (3 1) / (24 0) + 2/25 = 0.1633333. The selectivity of ind_pad is still 1. The selectivity of n2 is still 0.05. So we can produce a combined selectivity of 1 * 0.1633333 * 0.05 = 0.0081667 (and multiplying this by the number of rows in the table and rounding we get 82, as the plan says). If we slot this value for the selectivity into both places in the formula, what results do we get

~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.

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.

2 + ceiling(0.0081667 * 1,111) + ceiling(0.0081667 * 9745)

1. 2.

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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

blevel 10 80 what's gone wrong, the answer should be 264!

To start the Calculator program, click the Applications folder. One of the icons should say Calculator (hotkey U). Input your equation as you would on any calculator program.

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.

One handy tool in the Calculator program is that it can easily convert amounts to metric. Press the Menu key and scroll to To Metric.

used somewhat like auto_gcroot. We use the native class to open a file, and we see that it is closed when delete is called on the enclosing reference type or the enclosing object goes out of scope. Listing 12-21. Encapsulating a Native Pointer // native_in_managed.cpp #include <stdlib.h> #include <stdio.h> #include <time.h> using namespace System; using namespace System::Runtime::InteropServices; // template for embedding a native class // in a reference type template<typename T> ref class native_root { T* t; !native_root() { if (t) { delete t; t = NULL; } } ~native_root() { this->!native_root(); } public: native_root() : t(new T) {} // These must be static to prevent them from being used // within the class (e.g. when we use this-> in ~native_root).