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Back in 9, all of the stored procedure examples looked at data in singular form, selecting one or two columns from a single record in a table into a variable or two to use in making a decision. You might have places where using single pieces of data meets your needs, but you re probably left thinking that unless a routine can work with sets of data, stored procedures or functions aren t of much use to you. For example, you might have a stored procedure that needs to be capable of processing a large set of records, inserting data into a set of tables based on the values in each record. Doing all of this within a stored procedure makes a lot of sense, but you need to be able to issue a SELECT statement, retrieve the rows, and loop through them one at a time to determine how each record should be handled. With the addition of support for cursors in MySQL 5.0, processing sets of data within a stored routine is possible. The database cursor allows you to issue a SELECT statement in a procedure, either on a single table or joining multiple tables, and use a pointer to the data in the results to iterate over each record. With each record, you can use all of the available routine logic discussed in 9 and 10 to make decisions about what needs done with each record.

.NET developers need to keep synchronization in mind when designing a multithreaded application for these two main reasons: To avoid race conditions To ensure thread-safety Because the .NET Framework has built-in support for threading, it s possible that any class you develop may eventually be used in a multithreaded application. Although you don t need to (and shouldn t) design every class to be thread-safe because thread-safety isn t free, you should at least think about thread-safety every time you design a .NET class. The costs of thread-safety

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Now that we ve briefly looked at positioning and selecting the right hardware and software for your Nagios installation, we can look at actually installing the Nagios software. Nagios installations consist of two major components: the Nagios server and the Nagios plug-ins. The Nagios server is the core of the Nagios solution and performs functions such as interpreting the configuration, running the web console, and initiating notifications and checks. The Nagios plug-ins provide the interfaces to hosts, devices, and applications to allow you to monitor them; for

Note As of writing this chapter, MySQL has released version 5.0.6, which is labeled a beta release. While

and guidelines concerning when to make classes thread-safe are discussed later in this chapter. You don t need to worry about multithreaded access to local variables, method parameters, and return values, because these variables reside on the stack and are inherently thread-safe. Instance and class variables, however, will only be thread-safe if you design the class appropriately. Before we examine the nuts and bolts of synchronization, let s consider in detail the earlier ATM example in which Mr. and Mrs. Smith are both trying to withdraw the last $1,000 from the same account at the same time. Figure 15-1 clarifies the ATM scenario. Such a condition, where two or more threads try to access the same resource to change its state at the same time and produce an undesirable effect, is called a race condition. To avoid the race condition, you need to make the Withdraw() method thread-safe so that only one thread can access the method at any point of time.

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the cursor functionality in the database is stable enough to test and document, production users are encouraged to wait until a release of the 5.0.x branch that is labeled production.

ATM #1

example, the plug-ins package includes a plug-in called check_mysql that allows you to monitor the status of a MySQL database. It also contains plug-ins that can check common network services via TCP, User Datagram Protocol (UDP), or ICMP and others that allow local resources such as CPU, memory, and disk space to be checked. The plug-ins are called by the Nagios server and the results of the checks fed back into the Nagios server and actioned. I ll discuss this process further in 2 when I cover configuring Nagios.

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