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So far I ve spent all my time describing the way in which the clustering_factor, as calculated by Oracle, may not be truly representative of the way the data really is clustered in the table. With some understanding of the data and the way Oracle does its arithmetic, you can correct the problem, and I d like to stress the word correct.

// Declare a tracking reference and initialize to dereferenced handle. R% rref = *r; i = rref.P; // Access a member using the . operator.

You have learned the basics and can now navigate around your BlackBerry, but sometimes, you just want to get somewhere even more quickly. You may not use all the following information on a daily basis, but if you take the time to learn the hotkeys you will save time doing thing things you do most often. Throughout this book, we have shown you how to get the most out of your BlackBerry, where to find key information, and even suggested lots of tips and tricks to help along the way. BlackBerry s built-in hotkeys to quickly take you to an app or through a menu without needless scrolling and searching. For example, let s say you want to go to your Messages app once hotkeys are enabled, just hit the letter M. No scrolling, searching, or fumbling. These hotkeys can be very useful.

It is possible to tell Oracle anything you like about the statistics of your system, overriding any of the figures that it has collected; but the smart thing to do is to identify the numbers that are wrong and supply the right ones. It is not sensible simply to fiddle around creating numbers until some piece of SQL happens to work the way you want. It is easy to hack the statistics, but your aim should be to give Oracle a better idea of the truth because with an accurate image of your data, and the way you use it, the optimizer can do a better job. Since the only thing I ve been talking about in this chapter is the clustering_factor, I m going to tell you how to modify it, and what to modify it to.

CHAPTER 37: Hotkeys Open Almost any App with One Key!

Look at the package dbms_stats. It contains two critical classes of procedures: get_xxx_stats and set_xxx_stats. For the purposes of this chapter, we are interested only in get_index_stats and set_index_stats. In principle, we can always adjust the clustering_factor of an index by a piece of PL/SQL that reads the statistics from the data dictionary, modifies some of them, and writes the modified values back to the data dictionary, for example (script hack_stats.sql in the online code suite): declare m_numrows m_numlblks m_numdist m_avglblk m_avgdblk m_clstfct m_indlevel begin dbms_stats.get_index_stats( ownname => NULL, indname => '{index_name}', numrows => m_numrows, numlblks => m_numlblks, numdist => m_numdist, avglblk => m_avglblk, avgdblk => m_avgdblk, clstfct => m_clstfct, indlevel => m_indlevel ); m_clsfct := {something completely different}; dbms_stats.set_index_stats( ownname => NULL, indname => '{index_name}', numrows => m_numrows, numlblks => m_numlblks, numdist => m_numdist, avglblk => m_avglblk, avgdblk => m_avgdblk, clstfct => m_clstfct, indlevel => m_indlevel ); end; / number; number; number; number; number; number; number;

R^ r = gcnew R; // gcnew using default constructor r = gcnew R(); // gcnew using default constructor r = gcnew R(100, "xyz"); // gcnew with args

Hotkeys can get you around your BlackBerry home screen, but there are also hotkeys inside of each of the core apps. We will show you how to not only launch programs quickly, but how to jump around inside of your apps and menus. Once you enable your Home Screen Hotkeys, you will be able to launch most of the built-in applications with just one letter. This is extremely useful when you have lots of programs and you don t exactly remember where the launch icons are located. NOTE: Depending on the version of the operating system software installed on your BlackBerry smartphone, some of these Home screen hotkeys or key combinations may not work.