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I also define the conditions to monitor for, when and how often to trigger a notification, and whom to notify For example, I create a service for the Postfix daemon on the kitten host I tell Nagios that if it can t connect to the Postfix server, it should send a notification Finally, I define a contact group and a contact object for John; the latter includes details of his email address that Nagios will use to send notifications I then start the Nagios server and it will begin monitoring the kitten host If it detects any of the conditions I ve defined, it will notify John so he can investigate and fix the problem In this chapter, I ll demonstrate how to create all the objects required for an example such as this..

refers to the strategy deployed by MySQL when it does a sequential scan of all the key entries in an index This access type is usually seen only when both of the following two conditions exist: No WHERE clause is specified or the table in question does not have an index that would speed up data retrieval (see the preceding discussion of the range access type) All columns used in the SELECT statement for this table are available in the index This is called a covering index To see an example, let s go back to Listing 7-33, where we continued to see MySQL use an ALL access type, even though an index was available on columns in the WHERE condition The ALL access type indicates that a sequential scan of the table data is occurring.

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The attribute in question can be applied to a field An example of an attribute with this usage is <NonSerialized()>, which indicates that a particular field in a serializable class should not be serialized..

The Nagios server, the web console, and your monitoring configuration are controlled by a series of configuration files that are usually located in the /usr/local/nagios/etc directory. There are three types of configuration files. The first are the Nagios server and web console configuration files, which handle the behavior of the server and web console. These files are named nagios.cfg and cgi.cfg, respectively. I ll look at some of the options in these files that support your monitoring configuration in this chapter. In later chapters I ll go into some of the other options contained in these files in greater depth.

The reason the table data is being sequentially scanned is because of the SELECT *, which means that all table columns in CustomerOrder are used in the SELECT statement Watch what happens if we change the statement to read SELECT ordered_on, so that the only column used in the SELECT statement is available in the index on ordered_on, and we remove the WHERE clause to force a scan, as shown in Listing 7-35 Listing 7-35 Example of the index Access Type mysql> EXPLAIN -> SELECT ordered_on -> FROM CustomerOrder co \G *************************** 1 row *************************** id: 1 select_type: SIMPLE table: co type: index possible_keys: NULL key: ordered_on key_len: 3 ref: NULL rows: 6 Extra: Using index 1 row in set (000 sec) Notice that in the Extra column of the EXPLAIN output, you see Using index.

The attribute in question can be applied to an interface An example of an attribute with this usage is <InterfaceType()>, which we can use when exporting a NET interface to COM The attribute indicates whether the interface should be exposed as a dual interface, an IDispatch-based interface, or an IUnknownbased interface The attribute in question can be applied to a method An example of an attribute with this usage is <WebMethod()>, which indicates that a method is a Web Service method The attribute in question can be applied to a module (that is, a DLL or EXE file that comprises a multifile assembly) An example of an attribute with this usage is <Debuggable()>, which indicates that a module supports just-in-time debugging You can also use <Debuggable()> on assemblies The attribute in question can be applied to a parameter.

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