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The Services can be enabled or disabled for security purposes. Press the Space key to check or uncheck any services.

Queries that used an equality predicate can cope with the nondate data types, and if we sort the data by the pseudo-date columns, the order works out correctly. But range-based

So far in this chapter, you ve seen reference types and value types, and the many different ways of referring to objects in code. You ve learned the semantic differences between these methods, including objects with heap and stack semantics, tracking references, dereferencing handles, copying objects, lvalues, and the auto_handle template. Now focus will turn to how objects are passed to functions. As in classic C++, there are many ways to pass parameters, and it s important to know the semantic differences between all of them.

predicates produce incorrect cardinalities because the numeric and character versions of the information have huge gaps in them Oracle is aware that 1 April 2003 is one day after 31 March 2003, but cannot possibly apply the same logic when comparing 20030401 to 20030331, or '20030401' to '20030331' As we saw in 6, a query with a predicate of where n1 between 20021230 and 20030105 produced a cardinality of 396 in Oracle 9i, although we know that the query is supposed to report 7 days, and the equivalent query against the genuine date column produced a cardinality of 8 When we built a histogram of 120 buckets, the query against the numeric column got a lot closer, with an estimated cardinality of 15 rows We are now going to see why.

Once you have paired your BlackBerry with your computer, you can use Bluetooth to send and receive files. At publishing time, these files were limited to media files (videos, music, pictures) and address book entries, but we suspect that you will be able to transfer more types of files in the future.

In the Getting Started section of this chapter, I showed an SQL statement you could run against the user_tab_histograms table to show the widths and heights of the bars that the histogram data represented The version of date_odditysql that goes with this chapter does the same for the 120-bucket histogram against the numeric data, and a critical section of the results look like this: BUCKET LOW_VAL HIGH_VAL WIDTH HEIGHT ---------- ---------- ---------- ---------- ---------68 20021028 20021112 84 1813 69 20021112 20021127 15 1015 70 20021127 20021212 85 1791 71 20021212 20021227 15 1015 72 20021227 20030111 8884 0017 73 20030111 20030126 15 1015 74 20030126 20030210 84 1813 75 20030210 20030225 15 1015 76 20030225 20030312 87 175 77 20030312 20030327 15 1015 As you can see, the histogram manages to give Oracle a better picture of the data.

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Just like classic C++, C++/CLI supports passing parameters by value and by reference. Let s review how this works in classic C++, as in Listing 4-19. Passing a parameter by value means that the function gets a copy of the value, so any operations don t affect the original object. Passing a parameter by reference means that the object is not copied; instead, the function gets the original object, which may consequently be modified. In C++, parameters passed with a reference (&) to an object are passed by reference. That is to say, the object is not copied, and any changes made to the object in the function are reflected in the object after the function returns. Listing 4-19. Passing by Value and by Reference in Classic C++ // parameter_passing.cpp void byvalue(int i) { i += 1; } void byref(int& i) { i += 1; } int main() { int j = 10; System::Console::WriteLine("Original value: " + j); byvalue(j); System::Console::WriteLine("After byvalue: " + j); byref(j); System::Console::WriteLine("After byref: " + j); } The output of Listing 4-19 is