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Services can also have flap detection configured for them. Flap detection for service objects functions in an identical manner to flap detection for host objects. It does use different directives in the nagios.cfg configuration file, as shown here: low_service_flap_threshold=5.0 high_service_flap_threshold=20.0 These two directives control the global low and high thresholds for flap detection for your services. You need to ensure that the enable_flap_detection directive, the global directive that controls flap detection, is enabled if you want flap detection for either hosts or services. You also need to enable flap detection using directives in your service definition, as shown here: define service{ service_description flap_detection_enabled low_flap_threshold high_flap_threshold } SMTP 1 10.0 30.0

any novice database programmers are aware that indexes exist to speed the retrieval of data, yet many don t understand how an index s structure can affect the efficiency of data retrieval. This chapter will provide you with a good understanding of what s going on behind the scenes when you issue queries against your database tables. Armed with this knowledge of the patterns by which the server looks for and stores your data, you will make smarter choices in designing your schema, as well as save time when optimizing and evaluating the SQL code running against the server. Instead of needing to run endless EXPLAIN commands on a variety of different SQL statements, or creating and testing every combination of index on a table, you ll be able to make an informed decision from the outset of your query building and index design. If the performance of your system begins to slow down, you ll know what changes may remedy the situation. MySQL s storage engines use different strategies for storing and retrieving your data. Knowing about these differences will help you to decide which storage engine to use in your schemata. ( 5 covers the MySQL storage engines.) In order to understand what is happening inside the server, we ll begin by covering some basic concepts regarding data access and storage. Understanding how the database server reads data to and from the hard disk and into memory will help you understand certain key MySQL subsystems, in particular the key cache and storage engine abstraction layer (discussed in 4). In this chapter, we ll work through the following key areas: Data storage: the hard disk, memory, and pages How indexes affect data access Clustered versus non-clustered data page and index organization Index layouts Compression General index strategies

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Now let s turn our attention to how the clients and servers talk to each other to facilitate method calls on remote objects. Any form of remoting needs a transport mechanism. Given its ubiquity, there s no other option but TCP/IP as the base protocol. All you need to do now is define an application-level protocol to go on top. However, as you ve seen, a number of conflicting demands must be satisfied when choosing such a protocol. A proprietary binary protocol such as DCOM is not firewall-friendly. SOAP goes some way to resolving this, but it s a much looser, general-purpose heavyweight protocol, which isn t the best solution if you re looking for efficiency. One of the neat things about .NET Remoting is that you can choose your own transport mechanism.

Additionally, services can also have event handlers defined for them. As you can with hosts, you can define a global event handler for services that runs every time any service changes its state. This global event handler is defined in your nagios.cfg file using the directive on the following line: global_service_event_handler=global-service-events In addition to a global service event handler, you can define event handlers for each of your services as well. Here s an example: define service{ service_description event_handler_enabled event_handler } SMTP 1 server-restart

Summary

In .NET Remoting, a transport mechanism is referred to as a channel. By default, you get a choice of two channels: TCP and HTTP This is a great concept, but terrible terminology, because HTTP . , of course, also uses TCP as its underlying transport mechanism. What Microsoft really means by TCP channel is TCP/IP with proprietary binary protocol on top. What it means by HTTP channel is TCP/IP with HTTP on top. Of these two alternatives, the TCP channel is more compact and efficient, and ideal for use inside a firewall. The HTTP channel is more useful if your clients are outside your firewall. It gets better. If neither of these channel types suits your needs, then you can roll your own, which makes .NET Remoting infinitely extensible. We ll look at the issues involved in providing your own channel type in 2.

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