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The standard Firebird installation provides a number of tools and tricks for querying the state of indexes and for keeping them in good shape: For finding out about the selectivity and other meaningful characteristics of indexes, use gstat, a data statistics analyzer. Later in this chapter, we look at what gstat can tell you about your indexes. The tool for recalculating index selectivity is the SET STATISTICS statement (discussed in the next section). SET STATISTICS does not rebuild indexes. The best tool of all for cleaning up tired indexes is gbak, the backup and restore utility. Restoring a database from its latest backup will both rebuild all indexes and cause their selectivity to be freshly computed.

In some tables, the number of duplicate values in indexed columns can increase or decrease radically as a result of the relative popularity of a particular value in the index when compared with other candidate values. For example, indexes on dates in a sales system might tend to become less selective when business starts to boom. Periodically recomputing index selectivity can improve the performance of indexes that are subject to significant swings in the distribution of distinct values. SET STATISTICS recomputes the selectivity of an index. It is a statement that can be run from an isql interactive session or, in Embedded SQL (ESQL), can be passed from an application. To run this statement, you need to be connected to the database and logged in as the user that created the index, the SYSDBA user, or (on POSIX) a user with operating system root privileges. This is the syntax:

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SET STATISTICS INDEX name;

When I execute this test, I receive these results: IsSecurityEnabled: True IsSecurityEnabledAlt: True ManualSecurityCheck: False ManualSecurityCheckAlt: False GetCaller: VIVALDI\bruce Both of the calls to IsSecurityEnabled report that security is enabled. Both of the calls to IsCallerInRole correctly report that I am not in the AppManager role. And the AccountName property of the SecurityIdentity object correctly identifies me as the caller. The SecurityCallContext class contains two properties that are similar: DirectCaller and OriginalCaller. The two may be different, and you may need to check one or the other depending on your intent. In the example code just shown, DirectCaller is used. DirectCaller contains the identity used by the process that is directly calling our COM+ component. That may not be the same as OriginalCaller, which is the identity used by the original process that made the call. If the call passed between multiple processes (such as multiple Server COM+ applications that use different identities), these two properties could be different. SecurityCallContext also supports a Callers property. This is a collection of SecurityIdentity objects that identify all callers along the route leading to your component.

Figure 2-2 shows an example in which we have reworked the Bird class from earlier in this chapter and split it up into three classes. The new Parrot and Canary classes are subclasses of Bird. The fact that they each inherit the methods and properties of the Bird class is indicated by the arrows, whose heads point to the parent class.

The following statement recomputes the selectivity for an index in the employee.gdb database:

SET STATISTICS INDEX MINSALX;

On its own, SET STATISTICS will not cure current problems resulting from previous index maintenance that depended on obsolete selectivity statistics, since it does not rebuild the index.

The key aspect to note about this code is where you actually perform the function call. Does it look a little strange to you Thanks to the power of variable function calls, you can assign a value dynamically to a variable and then have the script look for a function that is named the same as the variable s value. Naturally, if PHP cannot find a function by that name, you will get the regular errors you would get for attempting to call a function that does not exist. The powerful aspect of this code is that you can use conditional statements to determine which function gets called.

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See recipe 8-8 (Using Role-Based Security).

To rebuild an index, use ALTER INDEX, or drop and re-create it, or restore the database from a gbak backup.

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