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Of course, looking at the first line in the preceding list, we know that 20021112 is meant to be just 14 days after 20021028, but Oracle thinks there are 84 days (numbers) that need to share the 14 rows from our original table The arithmetic for our query falls completely into bucket 72, so the optimizer uses the standard formula for selectivity, but using the endpoint values from the bucket We have a between clause, which means we have to allow for a correction factor at both ends of the range..

Figure 4-2. The left side shows the objects in the main method; the right side shows the copies of those values in the function byvalue, and the native reference to the original value in the function byref. Where pointers are involved, the rules are the same, but thinking about them can be a bit trickier. Let s turn the clock back to the time when the C programming language reigned supreme. Consider a somewhat dangerous C function, shown in Listing 4-20, that takes a pointer as a parameter. Listing 4-20. A Dangerous C Function void stringcopy(char* dest, char* src) { while (*dest++ = *src++); } The pointer src is modified within the function, but that does not affect the value outside the function because the pointer is passed by value. In those cases where you need a pointer to be modified, in C, you would use a double pointer (see Listing 4-21).

Note When you start creating histograms, it is no longer guaranteed that density = 1 / num_distinct,

You may need to add, edit, or delete e-mail accounts. You may want to fine-tune your email signature (Sent from my BlackBerry) attached to the bottom of each e-mail you send from your Curve.

(although it is still true in this test case, where we have no popular values and don t have a frequency histogram).

You can add up to 10 e-mail addresses to your Curve. Only one can be an Enterprise or corporate e-mail address, but the rest can be personal addresses including POP3 or IMAP addresses.

Listing 4-21 Using a Double Pointer in C // double_pointercpp #include <malloch> int newstring(void** new_buffer) { *new_buffer = malloc( 1024 ); if (! *new_buffer) return -1; return 1; } This is still passing by value, because the address of the pointer is copied When references were introduced in C++, passing parameters by reference were made possible For example, the code in Listing 4-22 increments an integer passed in Listing 4-22 Passing by Reference // passing_referencecpp void increment(int& i) { i++; } If you wanted to pass a pointer by reference in classic C++, you would use *&, a reference to a pointer void modify_pointer(CClass*& ptr); These constructs have equivalents in the C++/CLI managed world The handle symbol in the parameter list is used for objects passed by reference void g(R^ r); This is the normal way of passing reference types This default makes sense for several reasons.

In the past, we have used 1 / num_distinct for the correction factor and not worried about whether we should perhaps use the density. In most cases, it is actually the density that needs to be used, so our formula becomes the following: selectivity = ('required range' / 'total range of bucket' ) + 2 * density = (20030105 - 20021230) / (20030111 - 20021227) + 2 * 0.000547345 = 8875 / 8884 + 0.00109469 = 1.00008 But this is the selectivity that has to be applied to the number of rows in the buckets involved not to the entire table and there are 1,827 / 120 = 15 rows per bucket round(15 * 1.00008) = 15, as required. You will notice that every single value in the table appears exactly the same number of times. There are no values with very large numbers of occurrences. According to the traditional rules of thumb (small number of popular values, etc.) this data set does not need a histogram. But as you can see, a histogram makes an enormous difference to the optimizer.

Click you re the Personal E-mail Setup icon (possibly in the Setup folder). Enter your username and password (if requested) and click Log In. Scroll to the bottom of the list of e-mail addresses and click the Add button. Follow the steps to add the new account as described earlier.

Any column with a data distribution that does not have a completely flat, unbroken graph, may need a histogram if you use that column in a where clause. This graph is flat, but it has some big gaps in it that the optimizer needs to know about.

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