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Oracle uses histograms to improve its selectivity and cardinality calculations for nonuniform data distributions. But you can actually use two different strategies: one for data sets with only a few (fewer than 255) distinct values, and one for data sets with lots of distinct values. Oracle calls the former a frequency histogram (although technically it probably ought to be a cumulative frequency histogram) and the latter a height balanced histogram (although, as you saw earlier, the heights involved are not balanced in any way that a non-mathematician would appreciate). Although the two types of histogram have their own special features, there are many common areas in their use that I plan to cover in this section. At the simplest level, irrespective of type, a histogram is simply a collection of pairs of numbers (stored in views like user_tab_histograms, user_part_histograms, user_subpart_histograms) that can be used to draw pictures of the data. However, while collecting the histogram data, Oracle also collects some extra information that it uses to calculate a modified density for the column. After generating a histogram for a column, you will usually find that the density value reported in user_tab_columns (et al.) is no longer equal to 1 / num_distinct. When working out selectivities and cardinalities, Oracle may be able to make use of the full detail of the histogram, but sometimes has to fall back on using just the density. It is this fallback position that can cause surprises, so the rest of this section is a quick tour of features that interfere with the best use of histograms.

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2. Open the Web.config file for the application, locate the <authentication> element, and modify it so that it looks like the following, noting the inclusion of a child <deny> element inside the <authorization> element: <authentication mode="Forms"> <forms loginUrl="Secure/Login.aspx" /> </authentication> <authorization> <deny users=" " /> </authorization> Briefly, this tells ASP .NET that you will use a form to authenticate users and also specifies its location. Then you specify that Anonymous (not authenticated) users cannot access any page in this application (deny users=" "). If you had specified "*", you would be denying access to all users, whether they are authenticated or not. With this setting in effect, clients will be automatically redirected to the Login.aspx page whenever they try to open any ASP .NET page in this application. 3. Anonymous users will need to access the NewUser.aspx form in order to register, so you need to enable Anonymous access to that. Add the following code to the Web.config file, just above the closing </configuration> tag: <location path="Secure/NewUser.aspx"> <system.web> <authorization> <allow users="*" /> </authorization> </system.web> </location> This setting introduces an exception to the generic deny users=" ", for a specific path. In this case, you re allowing all users, whether authenticated or not, to access the specific page.

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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.

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Local page: The current hyperlink points to a one-based page index within the current document specified by the corresponding <hyperlinkPageExpression> element (hyperlinkType="LocalPage"). Remote anchor: The current hyperlink points to an anchor specified by the <hyperlinkAnchorExpression> element within an external document indicated by the corresponding <hyperlinkReferenceExpression> element (hyperlinkType= "RemoteAnchor"). Remote page: The current hyperlink points to a one-based page index specified by the <hyperlinkPageExpression> element, within an external document indicated by the corresponding <hyperlinkReferenceExpression> element (hyperlinkType= "RemotePage"). Any hyperlinkType value not in the preceding list is considered a custom hyperlink type. More details about those are given in the Custom Hyperlinks section, which follows.

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.

Note The Web.config file, sitting at the root of the web application, governs all settings for the application, such as security, debugging, and session management. A thorough examination of this configuration file format can be found in the MSDN documentation, at http://msdn.microsoft.com/library/en-us/ cpguide/html/cpconaspnetconfiguration.asp. We ll discuss the settings that apply to the features we introduce throughout the book as we go.

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