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Elements of Procedures and Triggers . . . . . . . . . . . . . . . . . . . . . . . . . . 573 Programming Constructs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 579 Developing Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 595 Up Next . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600

//setup the roles within the COM+ application [assembly: SecurityRole("AppAdministrator")] [assembly: SecurityRole("AppManager")] [assembly: SecurityRole("AppUser", true)] namespace DniScSecurityChecks { public interface ISecuredMethods { bool IsSecurityEnabled(); bool IsSecurityEnabledAlt(); bool ManualSecurityCheck(); bool ManualSecurityCheckAlt(); string GetCaller(); } [ComponentAccessControl(true)] [SecureMethod] [SecurityRole("AppUser", true)] [ClassInterface(ClassInterfaceType.None)] public class DniScSecurityChecksObj : ServicedComponent, ISecuredMethods

Broadly, the selectivity of an index is an evaluation of the number of rows that would be selected by each index value in a search. A unique index has the highest possible selectivity, because it can never select more than one row per value, whereas an index on a Boolean has almost the lowest selectivity. Indexing a column that, in production conditions, will store a single value predominantly, such as the Country of Birth item in the earlier election data example,

is worse than not indexing the column at all. Firebird is quite efficient at building bitmaps for non-indexed sorts and searches.

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The selectivity of a unique index is 1. All non-unique indexes have a value lower than 1. Selectivity (s) is calculated as

If you were not already familiar with classes and objects, then by now perhaps you are starting to see just how useful and economical they can be in PHP 5. However, we have not touched on one of their most powerful features, which lies in the ability to reuse an existing class when creating one or more new ones. This technique is known as extending a class. Extending classes is useful when you have multiple objects that have some but not all properties or methods in common. Rather than write a separate class for each object that duplicates the members that are common to all, you can write a generic class that contains these common elements, extend it with subclasses that inherit the common members, and then add those that are specific to each subclass.

where n is the number of distinct occurrences of the index value in the table. The smaller the number of distinct occurrences, the lower the selectivity. Indexes with higher selectivity perform better than those with low selectivity. The Firebird optimizer looks up a factor for calculating selectivity when a table is first accessed and stores it in memory for use in calculating plans for subsequent queries on that table. Over time, the initially calculated factors on frequently updated tables gradually become outdated, perhaps affecting the optimizer s index choices in extreme cases.

{ public bool IsSecurityEnabled() { SecurityCallContext context = SecurityCallContext.CurrentCall; return context.IsSecurityEnabled; } public bool IsSecurityEnabledAlt() { return ContextUtil.IsSecurityEnabled; } public bool ManualSecurityCheck() { SecurityCallContext context = SecurityCallContext.CurrentCall; return context.IsCallerInRole("AppManager"); } public bool ManualSecurityCheckAlt() { return ContextUtil.IsCallerInRole("AppManager"); } public string GetCaller() { SecurityCallContext context = SecurityCallContext.CurrentCall; SecurityIdentity identity = context.DirectCaller; return identity.AccountName; } } } The ApplicationAccessControl attribute that is applied to the assembly enables security for the COM+ application. The SecurityRole attributes applied to the assembly simply set up the roles within the application. When entered at the assembly level like this, they do not actually control access. At the class level, we add the ComponentAccessControl and SecurityRole attributes. ComponentAccessControl enables security for the component (the class). The SecurityRole attribute identifies the role that is required in order to access any of the methods in the class. The SecureMethod attribute informs the .NET runtime that calls to this class must be made via our interface. In this example, we specify the AppUser role with the optional second parameter of true. The second parameter causes the Everyone user group to be added to the role automatically. We ve created a role that automatically includes all users. Therefore, all the methods of this class are unrestricted and all users can call them.

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