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A lot of what is happening during the context switches is marshaling of parameters between native types and managed types. Marshaling for primitive types is straightforward and actually doesn t involve any work at runtime. Marshaling character, string, and structure types is not as straightforward. Table 12-2 shows the default mappings used. So, if the type used in the native function you re calling is as shown in one of the first two columns, the type in the P/Invoke signature should be one of the types in the last two columns.

Although I ve written out the exact formulae for each case, when I m working on a problem I rarely do more than use the quick approximation of requested range / total range. However, you will appreciate that when there are only a few distinct values for a column, this estimate could be a long way out it is a flaw that can have serious repercussions. Looking at the significance of the total range, you will also appreciate that you could get some unexpected results if you have an application that uses silly values to avoid nulls. Consider an application that holds five years worth of data (say 1 Jan 2000 to 31 Dec 2004). What will the optimizer s calculation for selectivity give for the predicate where data_date between '01-Jan-2003' and '31-dec-2003'

To install software on your BlackBerry, as we described earlier, you need to either click a link you received in your e-mail or SMS text message or start the Web Browser and Go To a web address where the software download files are located. In this example, we will use www.mobile.blackberry.com. 1. Navigate around the web site and click on a link for the software title you want to install. Usually, a License Agreement screen pops up. You must click Accept to continue with the download.

Ignoring the adjustments for leap years and boundary details, the answer is going to be roughly 1/5. If you allow proper nulls in the data_date column, the result is unchanged. But if your application vendor decides that nulls should not be allowed, and decides to use 31-Dec9999 instead, what happens As soon as a single pseudo-null value goes into the table, the optimizer calculates the selectivity as 1/8,000. (You want one year out of a range of 8,000.) What do you think is going to happen to your execution plan when the optimizer s estimate is out by a factor of 1,600 We will return to this, and similar problems, in 6.

The next screen to appear is the standard Download screen. This screen shows the name, version, the vendor (software company), and size of the program. Beneath all this information, you see a Download button to click on.

Table 12-2. Default Mappings Used When Marshaling Types Between Native and Managed Code (Continued)

Bind variables are good for OLTP systems, because they maximize sharable SQL and minimize CPU usage and latch contention during optimization (see Tom Kyte s Expert Oracle Database Architecture, Apress, September 2005) But we have just seen that bind variables make a complete nonsense of cardinality calculations So 9i introduced bind variable peeking to address this problem The first time a piece of SQL is optimized, the optimizer (usually) checks the actual values of any incoming bind variables, and uses those values to do the optimizer calculations, which means the optimizer has a chance of picking the best plan for that first execution But on every subsequent occasion that a parse call is issued against that statement, and the text is found to be sharable, the same execution plan will generally be used regardless of any change in the value of the bind variables.

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