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Oracle only uses histograms fully when there are highly visible input values in other words, in cases where you have predicates of the form column operator constant (although the constant might come from peeking at a bind variable). Think about this carefully, and you realize that Oracle may not be able to make much use of histogram information to help it optimize joins (but see 10). Consider this simple query: select t1.v1, t2.v1 from t1, t2 where and ; t1.n2 = 99 t1.n1 = t2.n1

Unboxing occurs when an object type is cast back to a primitive type, as shown in Listing 4-4. Listing 4-4. Unboxing an Object to an Integer // unboxing.cpp using namespace System; Object^ f(Object^ obj) { Console::WriteLine("In f, with " + obj->ToString() + "."); return obj; } int main() { int i = 1; int j = safe_cast<int>( f(i) ); // Cast back to int to unbox the object. } The output of Listing 4-4 is as follows:

Even if you have histograms on columns t1.n1 and t2.n1, how can Oracle have any idea about the range and frequency of values of the join columns for rows where t1.n2 is 99 On the other hand, remember that creating a histogram on a column will affect the recorded density of that column; so if calculations of join selectivity or cardinality use the density, then histograms on join columns will have some effect. Unfortunately, as you will see in 10, the calculation of join selectivity seems to use the num_distinct in Oracle 8i and Oracle 9i, and only switches to the density in Oracle 10g which means you could have some nasty surprises when you upgrade even when nothing has changed!

One of the features now available to Mac users is the ability to Backup and Restore either you entire BlackBerry contents or selected information on your Mac. Backup and Restore begins with the two icons at the top of the main screen in Desktop Manager.

I have seen a couple of papers suggesting that it is a good idea to create histograms on the columns at the ends of PK/FK relations. Unfortunately, the papers did not include any justification for this suggestion, nor did they offer an explanation of the issue that this was supposed to address. In fact, PK/FK joins are the one place where the optimizer seems to be really good at calculating the correct join cardinality unaided making histograms unnecessary. It is possible that the authors were considering the special case of joins where the primary key of the parent table appeared in a predicate with a literal constant (which, as you saw in 6, would be forwarded to the foreign key columns on the child table by transitive closure). In some cases, though, histograms do make a significant difference (as you will see in 10); but only under certain conditions that PK/FK joins aren t likely to meet.

Click the Backup icon and you will be taken to the next screen (Figure 4-20) where you specify exactly which information you would like to back up on your Mac.