Examples of this would be the pervasive use of database queries to support the integration of geographic and demographic data in market research and analysis applications (Adnan, Longley, Singleton, Brunsdon, 2010). The reliance on external systems is increasing as users are requiring more intensive analysis and data management functionality at the presentation layer of the model as well. External systems are fueling a higher level of expectations therefore as to what these applications will be able to provide in the future as well (Adnan, Longley, Singleton, Brunsdon, 2010). While there are many different types of databases in use globally, the most prevalent are relational in design and have the ability to create logical data structures that span across multiple physical locations. This is invaluable in creating e-commerce websites that require data from many different sources to deliver a strong user experience and guide the completion of transactions.

Conclusion

The three-tier model...

The level of integration between the data and business logic layers is also crucial, as e-commerce websites continue to add greater functionality, which translates into the requirement of more data, delivered in real-time.
References

Adnan, M., Longley, P., Singleton, a., & Brunsdon, C. (2010). Towards Real-Time Geodemographics: Clustering Algorithm Performance for Large Multidimensional Spatial Databases. Transactions in GIS, 14(3), 283-297.

Bahador Ghahramani. (2004). Analysis, design, and development model: a case study of an internet-based system for insert and parameter selection. Information Systems Journal, 14(2), 169-193.

Torsten Grabs, Klemens Bohm, & Hans-Jorg Schek. (2004). PowerDB-IR - Scalable Information Retrieval and Storage with a Cluster of Databases. Knowledge and Information Systems, 6(4),…