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fice. This is the simplest client/server format, and it works well in some situations. The main benefit is that these types of applications are easy to develop initially. However, there are several drawbacks. First of all, much of the business logic needed to process data is stored on the client. Whenever this information changes or business rules are updated, client software must be upgraded. In most cases, this involves visiting each of the client machines and installing updates. Another potential drawback is in the area of scalability: If the database server or the client is overloaded with work, the user will experience slow response times and throughput. Overall system performance is based on that of the clients and servers. Database servers are commonly used as part of a multi-tier, client/server architecture. Here, a front-end client program (either a Visual Basic application or an Active Server Page (ASP)-based web application) connects to a middle-tier server that contains the business rules. These data objects are then responsible for obtaining and processing the information requested from the clients. A typical scenario is shown in Figure 4-19. How is it more efficient to have multiple machines perform the work of just one There are two main benefits. First, the middle-tier server can be optimized for performing business rules operations only. It can pool together multiple requests for information and share these connections to the database server. The benefit for the database server is that it has to communicate directly with only one machine the middle-tier server. Because database connections can use many resources to establish and destroy connections, this can represent a significant performance increase. An effective network design will optimize the bandwidth between these two machines, further increasing overall information throughput. I promised two benefits of multi-tier solutions. We ve already covered performance. The second is scalability. If, for example, it is found that the performance of middle-tier components is inadequate, an additional middle-tier server might be implemented to share the workload. Similarly, multiple database servers could provide the data required for the middle-tier components to continue to work at peak performance. Using this modular approach, code and hardware resources can be optimized independently at
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Accessing Data from Applications
Many different methods can be used to access data from a SQL Server installation. Many are supported for backward-compatibility, while others optimize performance and ease of use. The three main methods for accessing data from applications include Open Database Connectivity (ODBC), ActiveX Data Objects (ADO), and OLEDB. Which option you choose will be based on the requirements of your application and the development environment in which you work. For example, for web-based applications, the ease of use of ADO makes it a good choice. ADO is also well-supported in such development tools as Microsoft Visual Basic and Microsoft Visual Interdev. For further information on data access methods, see SQL Server Books Online and the Microsoft Developer Network (MSDN) Online website at http://msdn.microsoft.com.
Programming Options
Microsoft has allowed external developers to access various portions of the SQL Server 7 API. Table 4-12 lists the various APIs available. Although most users will not need to
API Data Transformation Services API
Application Providing highly customized DTS tasks
Notes Can be used for creating customized packages that modify, import and export data. Adds the benefits of working with languages such as Visual C++. Provides greater control over the replication process for use in custom applications. Can be used to start, stop, and pause SQL Server services.
Open Data Services API Creating SQL Server extended stored procedures Replication Component Programming API SQL Control Manager (SCM) Setting up and managing SQL Server replication Controlling SQL Server services
SQL Data Manipulation Managing and modifying Useful for creating custom SQL Server configuration SQL Server administration Objects (SQL-DMO) and settings and management tools.
Table 4-12.
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