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We ve been through a lot of details on using stored functions in MySQL. We started the chapter looking at functions in general, and how functions compare with other database-level tools. In addition to finding the right use for functions to meet the requirements set for your database, you should be familiar with the specifics of MySQL s implementation of functions before diving into moving pieces of your business logic into functions. After reviewing the general concepts of stored functions, we dug into examples and details of the commands used to build functions. We looked at how to create functions to encapsulate calculations, and how to create functions that use other functions. We also went through details on managing existing functions with the SHOW, ALTER, and DROP commands. We concluded the chapter by discussing the permission scheme for functions and looked into the significance of functions on query performance. At the beginning of the chapter, we talked about needing a function to convert a statement to make the first character uppercase and the rest in lowercase. To bring the chapter full circle, here s the ucasefirst() function: CREATE FUNCTION ucasefirst (phrase VARCHAR(255)) RETURNS VARCHAR(255) RETURN CONCAT(UCASE(SUBSTR(phrase,1,1)),SUBSTR(LCASE(phrase),2)); And here s how it works: mysql> SELECT ucasefirst("tEST THe caSE-CHANGING funCtion!"); +------------------------------------------------+ | ucasefirst("tEST THe caSE-CHANGING funCtion!") | +------------------------------------------------+ | Test the case-changing function! | +------------------------------------------------+ The ability to create your own functions in MySQL whether to perform a calculation, manipulate data, or format data using native SQL statements gives you a simple, yet powerful set of commands and syntax. Using stored functions, you can now encapsulate and organize logic, extending your database to better meet the needs of your application and users.

n the previous chapters, we discussed how threads play an important role in developing multiuser applications. We used threads to solve some significant problems such as giving multiple users or clients access to the same resource at the same time. We ignored one issue that now needs to be addressed: what would happen to the resource if one user changes the state of the resource at the same time another user wants to change the state of the same resource For example, Mr. and Mrs. Smith both decide to empty their joint checking account by withdrawing the balance of $1,000 from an ATM. Unfortunately, they forget to decide who will actually do the job. So, ironically, Mr. and Mrs. Smith both access the checking account from different ATMs at exactly the same time. If two people access the same account at the same time, and the application is not thread-safe, it s possible that both ATMs will detect that there is enough amount in the checking account and dispense $1,000 to each person. In effect, the two users are causing two threads to access the account database at the same time.

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Obviously if the hosts and devices you are monitoring are located in one site and the nature of the Tip outage is connectivity to that site, then the presence of redundant servers will not help you in monitoring the hosts at that site.

n the previous chapters, we looked at both stored procedures and stored functions, and the new possibilities they bring to MySQL 5.0. As we explored these new routines, we left out a very useful piece of syntax that opens up even more possibilities in the use of stored routines: the syntax for cursors. Cursors, like stored procedures and functions, are new to MySQL in version 5.0. Cursors are a welcome addition for people who are coming from cursor-capable databases or have been using MySQL but grumbling about not being able to use cursors. Most major databases provide cursor functionality, including DB2, Oracle, SQL Server, Sybase, and PostgreSQL. With 5.0, MySQL joins the ranks of other cursor-capable database systems. Even if you haven t used cursors in a database before, this chapter will provide the information you need to try them out. In this chapter, we will cover the following topics related to cursors: Database cursor basics MySQL s implementation of cursors How to create cursors An example of using cursors

of allowing only one thread to access a resource at any point of time is called Synchronization. Synchronization is a feature available to developers for creating thread-safe access to critical resources.

Also a consideration for your Nagios servers is backup and recovery. You should include your Nagios server(s) in your normal backup regime and disaster recovery planning.

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