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Oracle may have trouble creating a frequency histogram if you use the dbms_stats package (which you should) even if you have only 180 to 200 distinct values in the column. In this case, you can always use manual methods to generate the histogram and populate the data dictionary. If you have a larger number of distinct values in a column, you will have to make a guess about the number of buckets. In most cases, simply electing to use the maximum will be a safe option. But you may get unlucky. Be aware of your popular, or strange, values, and make sure that they are visible in the histogram. Remember also that the histogram exists to help the optimizer you can always subvert Oracle s internal method for generating a histogram to present the critical features of your data to the optimizer. Remember that there are many more reasons for histograms than just the simple-minded examples of a small number of very popular values.

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.

hist_intro.sql similar.sql dist_hist.sql c_skew_freq.sql c_skew_freq_01.sql c_skew_freq_02.sql fake_hist.sql hack_stats.sql c_skew_ht_01.sql hist_sel.sql date_oddity.sql defaults.sql setenv.sql

To pass reference type objects by value, omit the handle symbol, as shown in the declaration of the function h in Listing 4-23. While this is normal for a value type, it is also possible for a reference type as long as the reference type has a copy constructor. Listing 4-23. Passing a Reference Type by Value // pass_by_value.cpp using namespace System; ref struct R { R() { val = 1; } // copy constructor R( R% r) { val = r.val; } property int val; };

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.

Generates a large set of data with a normal distribution Demonstration of effects of cursor_sharing = similar Demonstrates that distributed queries ignore histograms Generates a frequency histogram example Some examples of the cardinality you get with frequency histogram Example of generating a frequency histogram Examples of the effects of faked statistics on histograms Script to modify statistics directly on the data dictionary Some examples of the cardinality you get with height balanced histograms Further example of cardinality with height balanced histograms Example of how histograms can help with incorrect data types Example of how histograms can help with extreme default values Sets the standardized test environment for SQL*Plus

2. 3. 4.

hen I started writing this chapter, I thought it would be much shorter than the equivalent chapter on B-tree indexes ( 4) for two reasons First, bitmap indexes are actually hidden inside B-tree structures, so most of the groundwork for the calculation is in the other chapter (so you probably ought to read that chapter before you read this one) Second, bitmap indexes are much less subtle (I thought) than B-tree indexes, so there are fewer complications to consider However, as I started writing, I realized that my casual assumption was wrong Strategically, you use bitmap indexes very differently from B-tree indexes, so although there isn t a lot of new information to worry about when you consider just one bitmap index, you ve missed the point of bitmaps if you stop at one.

// R passed by value (no ^) void f(R r_local) { // Modify r without affecting outer scope. r_local.val = 2; Console::WriteLine("Within f: " + r_local.val); } int main() { R r; f(r); Console::WriteLine("Outside f: " + r.val); // The same code, using heap semantics R^ rhat = gcnew R(); f(*rhat); // Dereference the handle. Console::WriteLine("Outside f: " + rhat->val); } The output of Listing 4-23 is as follows: Within f: 2 Outside f: 1 Within f: 2 Outside f: 1 Figure 4-4 shows what s happening in memory for this type of parameter passing.

As you setup each e-mail account, you will notice a new icon appearing on your Home screen tied to that particular account. If you like having individual icons, you can leave them alone. However, since all of your e-mail goes into your main Messages icon, you can hide these icons to clean up your Home screen. Follow these steps to hide these extra icons. 1. 2. 3. Highlight the icon you want to hide. Press the Menu key. Select Hide.