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As mentioned earlier in the chapter, attribute classes inherit from System.Attribute, and all the predefined attribute classes in .NET end with the word Attribute. There are two additional restrictions for attribute classes: Attribute classes must not be declared as MustInherit. In other words, an attribute class must be a concrete class, not an abstract class. Attribute classes must be preceded by an <AttributeUsage()> attribute, which indicates whether the attribute applies to a class, a method, a field, or some other coding element. We can also use <AttributeUsage()> to specify two additional characteristics for an attribute: We can define whether the attribute can be used multiple times on the same coding element. For example, later in the chapter we ll define an attribute class named AuthorAttribute, which we ll use to identify the author of a class. We ll allow AuthorAttribute to be used multiple times on the same class, because some classes have multiple authors. We can also define whether the attribute can be inherited by subclasses. For example, we ll indicate that AuthorAttribute is not inherited by subclasses, because the author of the subclass might be different from the author of the original class. To illustrate these rules, let s take a closer look at the <Serializable()> attribute we used earlier in the chapter. As you ll recall, you can use the <Serializable()> attribute to indicate that a class (or structure, enumerated type, or delegate) is serializable. Figure 11-5 shows the VS .NET Help screen for the <Serializable()> attribute; to obtain this help screen, type SerializableAttribute class, about SerializableAttribute class in the VS .NET Help Index field.

Extra: Using where 1 row in set (000 sec) As you can see, no possible keys (indexes) were available for the range access strategy to be applied Let s see what happens if we add an index on the ordered_on column, as shown in Listing 7-33 Listing 7-33 Adding an Index on CustomerOrder mysql> ALTER TABLE CustomerOrder ADD INDEX (ordered_on); Query OK, 6 rows affected (035 sec) Records: 6 Duplicates: 0 Warnings: 0 mysql> EXPLAIN -> SELECT * -> FROM CustomerOrder co -> WHERE ordered_on >= '2005-01-01' \G *************************** 1 row *************************** id: 1 select_type: SIMPLE table: co type: ALL possible_keys: ordered_on key: NULL key_len: NULL ref: NULL rows: 6 Extra: Using where 1 row in set (000 sec) Well, it seems MySQL didn t choose the range access strategy even when the index was added on ordered_on.

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In this case the $HOST and $FACILITY macros will be used as the value of the hostname and service description s of the Nagios objects that will receive the syslog messages For the check result to be usable, you ll therefore need to create host and service objects for each host and facility combination you wish to process messages for In this case we would need to create a host object for the host that generated the message and a service for each facility that we wish to process messages for For example, if the host puppy was the source of the messages and we were using a filter to only select messages from the mail facility, we would need a host object for the puppy host and a service object called mail for the mail facility.

Notice the following points in Figure 11-5: The class SerializableAttribute is defined in the System namespace. Later in the chapter, you ll see many examples of attributes that are defined in different namespaces. In this respect, attribute classes are just like normal classes; they are defined in whichever namespace makes the most sense. SerializableAttribute inherits from System.Attribute. All attribute classes inherit from System.Attribute. SerializableAttribute is not declared as MustInherit, which means it is a concrete class. However, notice that SerializableAttribute is declared as NotInheritable, which means it is a sealed class; we cannot derive new subclasses from SerializableAttribute. This is a particular facet of the SerializableAttribute class; there is no intrinsic .NET requirement for attribute classes to be declared as NotInheritable.

Why did this happen The answer has to do with some of the concepts you learned in 2 regarding how MySQL accesses data When MySQL does an evaluation of how to perform a SELECT query, it weighs each of the strategies for accessing the various tables contained in your request using an optimization formula Each access strategy is assigned a sort of sliding performance scale that is compared to a number of statistics The following are two of the most important statistics: The selectivity of an index This number tells MySQL the relative distribution of values within the index tree, and helps it determine how many keys in an index will likely match the WHERE or ON condition in your query This predicted number of matching key values is output in the rows column of the EXPLAIN output.

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