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This sounds almost too good to be true, and, as is usually the case, it s more difficult to write generic code than it is to write code for a specific component, event, or property. You have to work a bit harder to discover the information that you need to achieve your task. Furthermore, using reflection can cause inefficiencies at runtime due to the extra effort the application has to expend to access the required metadata. However, the overall effect is worth the effort, as you ll see in the following application. The sample application for this section of the chapter appears in Figure 12-6. You can download this Windows Forms application from the Downloads section of the Apress Web site (http://www.apress.com).

In Listing 8-16, we explicitly tell MySQL we want to remove the records from the RssEntry table We then perform an inner join on a derived table containing the outer join from Listing 8-15, referencing the rowID column (join and derived table techniques are detailed in 7) As expected, the query removes the 135 rows from RssEntry corresponding to our orphaned records Listing 8-17 shows a quick repeat of our initial report queries from Listing 8-13, verifying that the referencing summary report contains counts matching a nonreferencing query Listing 8-17 Verifying That the DELETE Statement Removed the Orphaned Records mysql> SELECT sitename, COUNT(*) -> FROM RssEntry re -> INNER JOIN RssFeed rf -> ON rerssID = rfrssID -> WHERE rerssID BETWEEN 420 AND 425 -> GROUP BY sitename; +--------------+----------+ | sitename | COUNT(*) | +--------------+----------+ | pickajobcom | 850 | +--------------+----------+ 1 row in set (0.

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SNMP traps are alerts and notifications generated by SNMP-enabled devices. The traps contain information about the status or an event on an SNMP-enabled device. For example, an authentication event or the change in status of an interface on a router may generate an SNMP trap that is sent to a management station of some sort, such as HP OpenView or CiscoWorks. There are two possible ways Nagios can interact with SNMP traps. The first is

The application allows the user to dynamically change any property on the upper label component on the form. Table 12-1 lists the components in the form. Table 12-1. Form Components

00 sec) mysql> SELECT COUNT(*) FROM RssEntry -> WHERE rssID BETWEEN 420 AND 425; +----------+ | COUNT(*) | +----------+ | 850 | +----------+ 1 row in set (000 sec).

for Nagios to be the SNMP management station and receive traps as passive check results for a service. The second way is to send check results for hosts and services in the form of SNMP traps to a SNMP management station. I ll examine both ways of handling SNMP traps in this section.

The MySQL benchmarking suite gives you the ability to run one specific test against the database server, in case you are concerned about the performance comparison of only a particular set of operations. For instance, if you just wanted to run benchmarks to compare connection operation performance, you could execute the following: #> ./test-connect

System.Windows.Forms.Label System.Windows.Forms.ListBox System.Windows.Forms.TextBox System.Windows.Forms.Button System.Windows.Forms.RichTextBox

For both ways of interacting with SNMP traps, the Net-SNMP package needs to be installed on your Nagios server. The Net-SNMP package is available from http://net-snmp. sourceforge.net.

This will start the benchmarking process that runs a series of loops to compare the connection process and various SQL statements. You should see the script informing you of various tasks it is completing. Listing 6-2 shows an excerpt of the test run. Listing 6-2. Excerpt from ./test-connect Testing server 'MySQL 5.0.2 alpha' at 2005-03-07 1:12:54

The main VB source file in the application has the following Imports statements: Imports Imports Imports Imports System System.Windows.Forms System.Drawing.Design System.ComponentModel ' ' ' ' For For For For general .NET types general Windows Forms types the UIEditor class (see later) the .NET Component Model types

Testing the speed of connecting to the server and sending of data Connect tests are done 10000 times and other tests 100000 times Testing connection/disconnect Time to connect (10000): 13 wallclock secs \ ( 8.32 usr 1.03 sys + 0.00 cusr 0.00 csys =

s The Net-SNMP site also contains quite a bit of useful information about SNMP and how to use it. Tip

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