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Consider the following key points when capturing system functions and/or business processes: Evaluate the competitor s Web site, since it is likely that keeping up with the competition will eventually become a project goal. Remember to take all categories of users into account when soliciting possible user activities. Customers, administrators, vendors, and call-center representatives are likely to use and have access to very different aspects of the application that may not be easily found in the documentation.
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Spend extra time soliciting exception- and error-case activities, which are often implied or buried in documentation. If you find activities missing that seem important to you, or that appear in competing applications, consult with the relevant team members as soon as possible. These may indicate unintentional oversights.
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Capture the Logical and Physical Architecture
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In this step, you identify the relationship between the application and the structure of the hardware and software. This information is critical when you are designing performance tests to address specific areas of concern, and when you are trying to locate a performance bottleneck. A poor understanding of system architecture can lead to adverse affects on performance testing later in the project and can add time to the tuning process. To capture the logical and physical architecture, the performance tester generally meets with technical stakeholders, architects, and administrators for both the production and test environments. This is critical because designing an effective test strategy requires the performance tester to be aware of which components or tiers of the system communicate with one another and how they do so. It is also valuable to understand the basic structure of the code and contributing external software. Because the term architecture is used in so many different ways by different teams, the following sections have been included for clarity.
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Logical Architecture
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Logical architecture, as it is used in this chapter, refers to the structure, interaction, and abstraction of software and/or code. That code may include everything from objects, functions, and classes to entire applications. You will have to learn the code-level architecture from your team. When doing so, remember to additionally explore the concept of logical architectural tiers. The most basic architecture for Web-based applications is known as the three-tier architecture, where those tiers often correspond to physical machines with roles defined as follows: Client tier (the user s machine) presents requested data. Presentation tier (the Web server) handles all business logic and serves data to the client(s). Data storage tier (the database server) maintains data used by the system, typically in a relational database.
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Figure 8.1 Three-tier Architecture More complex architectures may include more tiers, clusters of machines that serve the same role, or even single machines serving as the host for multiple logical tiers.
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Figure 8.2 Multi-tier Architecture Specifically, this complexity implies the following: It is reasonable to think of a logical tier as a grouping of related functions. Any tier that is depicted in a logical diagram may span more than one physical machine, share one or more machines with one or more other tiers, or be exclusively tied to a dedicated machine. Arrows connecting logical tiers represent a flow of data, not network cables or other physical connections.
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One source of confusion is that virtually no one uses terms such as file storage tier. The file storage tier is generally referred to as the file server, whether or not that tier resides on a dedicated server. The same is true of the presentation tier (Web server), application or business logic tier (application server, often abbreviated as app server), data storage tier (database server), and so on. Put simply, the key to understanding a logical architecture is that in this type of architecture, each tier contains a unique set of functionality that is logically separated from the other tiers. However, even if a tier is commonly referred to as server, it is not safe to assume that every tier resides on its own dedicated machine.
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