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We have seen in earlier chapters that the optimizer uses the density as the selectivity for predicates of the form column = constant or column = :bind_variable. So with histograms in place, the selectivity of a simple equality predicate changes, even for a query involving a bind variable. If you ve ever heard that histograms become irrelevant when you use (un-peeked) bind variables, it s not quite true the detail cannot be used, but the effect of the density may be very relevant. Unfortunately, as I noted earlier, if there is a particular area of the graph that you are really interested in, you may need to override Oracle s estimated density and create a business-relevant density.

You have the option of choosing whether your BlackBerry syncs only with this Mac or with other computers. If your BlackBerry syncs with your PC and with your Google account, select the With other computers option to avoid duplicating entries in your contacts and calendars.

Of course, things got messier when 9i introduced bind variable peeking. Whenever a statement is optimized, Oracle will (in almost all cases) check the actual values of any bind variables and optimize the statement for those specific values.

2. To create a backup each time you connect your device, check the Automatically back up box (Figure 4-15). You can specify exactly what you would like backed up. We cover the Backup options a bit later.

The CTS represents a set of type relationships that many C++ programmers will find unfamiliar. There is no multiple inheritance, and only reference classes can be allocated on the managed heap and support inheritance and virtual functions. 2 will explain these differences. I ll use the term managed type to mean any type that is part of the CLR s type system. The C++/CLI type system for managed types is designed to allow the use of managed types in C++/CLI programs. Because all managed types must inherit (directly or indirectly) from the root type, Object, even the primitive types used in managed code (the managed versions of int, double, etc.) have a place in this type system, in the form of objects that wrap or box each primitive data type. The base class library defines a namespace called System, which contains fundamental types and other commonly used constructs. In fact, the CTS defines most primitive types in the System namespace with their own names, such as System::Int32. These names are common to all languages using the CLR. The primitive C++/CLI types such as int are synonyms for those types (e.g., int is synonymous with Int32), so that you have the convenience of referring to the type using the same name you d use in C++. You can use two ways to refer to most primitive types. In 2, you ll learn how the primitive types in C++ map onto the CLI common type system.

When an SQL statement is first executed, it has to be checked for syntax, interpreted, and optimized. Thereafter if the same piece of text is fired at the database again, it may be recognized as previously used, in which case the existing execution plan may be tracked down and reused. However, even when a statement is still in memory, some of the information about the execution plan may become invalid, or may get pushed out of memory by the standard memory management LRU routines. When this happens, the statement will have to be reoptimized. (You can detect this from the loads and invalidations columns in v$sql, summarized in the reloads and invalidations columns of v$librarycache. Reloads occur when information is lost from memory; invalidations occur when some of the dependent information changes.) The reuse (or sharing) of SQL is generally a good thing but if the execution plan generated on the first use of a statement caters to an unlucky set of values, then every subsequent execution of that statement will follow the same unlucky execution plan until you can force the statement out of memory perhaps by the extreme method of flushing the shared pool. Bind variable peeking has the unfortunate side effect of making it very easy for one user to introduce an execution plan that is bad news for every other user for an arbitrary amount of time, until that execution plan happens to get flushed from the shared pool for some reason.