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Recalculating index selectivity updates a statistical factor stored in the system tables. The optimizer reads this just once when choosing a plan it is not highly significant to its choices. Frequent, large DML operations do not necessarily spoil the distribution of distinct index key values. If the indexing is reasonable, the demographics of value distribution may change very little. Knowing the most accurate selectivity of an index has its greatest value to the developer. It provides a metric to assist in determining the usefulness of the index. If the efficacy of a plan degrades over time because of large numbers of inserts or changes to the key column(s) that change the distribution of index key values, the query may slow down gradually. Any index whose selectivity drops dramatically over time should be dropped because of its effect on performance. Understanding and dealing with a rogue index that deteriorates with table growth, to the extent that it interferes with plans, is an important part of database tuning. However, the most crucial effect of using an index that intrinsically has very low selectivity has nothing to do with the optimizer and everything to do with index geometry.

Firebird builds binary trees for indexes. It stores these structures on index pages, which are nothing more special than pages that are allocated for storing index trees. Each distinct value in an index segment has its own node off the root of the tree. As a new entry is added to an index, it is either placed into a new node if its value does not already exist or stacked on top of any existing duplicate values. Figure 18-2 illustrates this binary mechanism in a simplified form.

Note Unlike some object-orienting programming languages, PHP 5 does not support multiple inheritance.

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When duplicate values arrive, they are slotted into the first node at the front of the chain of other duplicates this is what is occurring with value ghi in the diagram. This structure is referred to as a duplicate chain.

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Each method of the class uses either SecurityCallContext or ContextUtil to obtain information about the current caller and return it. A C# client to use this class and display the results looks like this: using System; using System.Runtime.InteropServices; using DniScSecurityChecks; namespace ScSecurityChecks { class Program { static void Main(string[] args) { try { ISecuredMethods obj = new DniScSecurityChecksObj(); bool isSecurityEnabled = obj.IsSecurityEnabled(); Console.WriteLine( "IsSecurityEnabled: {0}", isSecurityEnabled); isSecurityEnabled = obj.IsSecurityEnabledAlt(); Console.WriteLine( "IsSecurityEnabledAlt: {0}",isSecurityEnabled); bool isInRole = obj.ManualSecurityCheck(); Console.WriteLine( "ManualSecurityCheck: {0}", isInRole); isInRole = obj.ManualSecurityCheckAlt(); Console.WriteLine( "ManualSecurityCheckAlt: {0}", isInRole); string caller = obj.GetCaller(); Console.WriteLine( "GetCaller: {0}", caller); } catch (Exception e) { Console.WriteLine( "Exception: {0}", e.Message); } Console.Read(); } } }

A duplicate chain, per se, is fine all non-unique indexes have them. An update of the segment value, or the deletion of a row, is very costly when the chain of duplicates is very long. One of the worst things you can do to a Firebird database is define a table with a million rows, all with the same key value for a secondary index, and then delete all those rows. The last duplicate stored appears first in the list, and the first stored is last. The deletion ordinarily takes the first row stored first, then the second, and so on. The index walking code has to run through the whole duplicate chain for each deletion, always finding the entry it wants in the very last position. To quote Ann Harrison, It churns the cache like nothing you ever saw. The cost of all that churning and roiling is never borne by the transaction that deletes or updates all the rows in a table. Updating a key value or deleting a row affects the index later, when the old back version is garbage collected. The cost goes to the next transaction that touches the row, following the completion of all of the transactions that were active when the update or delete occurred.

In other words, a derived class can have only one parent. However, a class can have multiple child classes. In addition, a PHP 5 class can implement multiple interfaces (see recipe 2-9 later in this chapter).

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