The Applications Handbook.pdf - Nexus Technologies Inc.

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Chapter 3 RUN: Maintaining the Responsive Live Application Key Questions: Application performance and availability • Will the application function, perform, and be secure when it goes live? • Are performance problems resolved quickly? • How do we keep up with changing security threats? Application change management • When will the problem be fixed, and when will the enhancement be available? • Do we have the resources to make the requested change, or will doing so derail a more urgent request? • How do we know if a problem is really an application problem or an infrastructure issue? Successful deployment of an application into production is reason for celebration. Whatever the sweat and tears to get it there, the labor of delivery is at an end. But this metaphor of birthing pains is appropriate for another often overlooked reason: The launch of an application represents a beginning, not an end. 69
70 ■ The Applications Handbook When we look at the complete lifecycle, it’s obvious that launch may signal the conclusion of the application team’s major effort, but for the production teams who must work with their pre-production peers to ensure that the application is responsive to the business, it’s only the start. To qualify as “responsive,” the application has to perform well technically, with good response times for all users. It also has to serve the business by changing as needed easily, efficiently, and with minimal risk. In this context, application performance management and application change management are critical disciplines in running an effective live application. • Application performance management assures that applications are of consistently high quality. • Application change management is the key to running applications that are change-ready. Application Performance Management For a vivid example of why so many want to dissolve traditional IT silos, consider the usual approach to confirming application performance. • Preproduction teams work to develop complex, comprehensive test scripts that will realistically mirror end-user behavior. • When the apps go live, these scripts go into a drawer, saved for future releases and regression tests. • Production teams create performance scripts to verify application response times in the live environment. But this lack of sharing works both ways. Real user behavior has the uncanny ability to reveal critical application weaknesses and faulty assumptions that the development teams
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