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Application databases are generally the smallest, simplest, and easiest databases to work with. These databases are usually the ones that we developers don t mind working with, or perhaps even like working with. Application databases are usually designed and implemented alongside the application as part of the same project. For this reason, there is generally more freedom in terms of design and are therefore more capable of making the design right for our particular application. There is minimal external influence in an application database, and there are usually only one or two interfaces. The first interface will be to the application, and the second might just be a simple reporting framework or tool like Crystal Reports. Figure 1.4 shows an application database and its relationships at a very high level.

Application databases are sometimes small enough that they can be deployed to the same server as the application. With application databases there is more infrastructure freedom as well. With small application databases, it is generally easier to convince companies to buy into using cheaper open source RDBMS solutions such as MySQL or PostgreSQL instead of spending money on Oracle or SQL Server. Some applications may even use an embedded application database that runs within the same virtual environment as the application itself, and therefore does not require a separate SQL at all. iBATIS works very well as a persistence framework for application databases. Because of the simplicity of iBATIS, a team can get up to speed very quickly with a new application. For simple databases, it s even possible to generate the SQL from the database schema using the administrative tools that come with your RDBMS. Tools are also available that will generate all of the iBATIS SQL Map files for you.

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1. Hacking is not the same as cracking, which is a term describing computer crime. The two are often confused. Hacking basically means having fun while programming. For more information, see Eric Raymond s article How to Become a Hacker at http://www.catb.org/~esr/faqs/hacker-howto.html.

.NET Framework 4 SQL Server 2008 SP1 Express (or higher edition) Visual Studio 2010 (any edition): Visual Studio is not required for SQL Server Modeling CTP Release 3, but for full functionality with Visual Studio and M Tools integration, Visual Studio 2010, Visual C#, and Visual Web Developer are required.

Enterprise databases are larger than application databases and have greater external influence. They have more relationships with other systems that include both dependencies, as well as dependents. These relationships might be web applications and reporting tools, but they might also be interfaces to complex systems and databases. With an enterprise database, not only are there a greater number of external interfaces, but the way that the interfaces work is different too. Some interfaces might be nightly batch load interfaces, while others are real-time transactional interfaces. For this reason, the enterprise database itself might actually be composed of more than one database. Figure 1.5 depicts a high-level example of an enterprise database. Enterprise databases impose many more constraints on the design and use of the database. There is a lot more to consider in terms of integrity, performance, and security. For this reason, enterprise databases are often split up to separate concerns and isolate requirements. If you tried to create a single database to meet all the requirements of an enterprise system, it would be extremely expensive and complex, or it would be completely impractical or even impossible.

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In the example depicted by figure 1.5, the requirements have been separated in terms of horizontal and nonfunctional requirements. That is, the databases have been separated into integration concerns, online transactional concerns, and reporting concerns. Both the integration database and the reporting database interface with the transactional system via a batch load, which implies that for this system it is acceptable to have reports that are not exactly up-to-date and that the transactional database only requires periodic updates from third-party systems. The advantage is that the transactional system has a great deal of load lifted from it and can have a simpler design as well. Generally it is not practical to design a database that is efficient for integration, transactions, and reporting. There are patterns for each that ensures the best performance and design. However, it is sometimes a requirement to have near real-time integration and reporting functions. For that reason this kind of design may not work. You might instead find that your enterprise database has to be partitioned vertically by business function. Regardless of your enterprise database design, it s easy to appreciate the difference between an application database and an enterprise database. It s important to understand the particular limitations of your environment to ensure that your application uses the database effectively and is a good neighbor to other applications that are using the same database.

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