Why should I use SimpleDB?
You now have an overview of the service, and you are reasonably familiar with what SimpleDB can do. It is a great piece of technology that enables you to create scalable applications that are capable of using massive amounts of data, and you can put this power and simplicity to use in your own applications.
Make your applications simpler to architect
You can leverage SimpleDB in your applications to quickly add, edit, and retrieve data using a simple set of API calls. The well-thought-out API and simplicity of usage will make your applications easier to design, architect, and maintain in the long run, while removing the burdens of data modeling, index maintenance, and performance tuning.
Build flexibility into your applications
You no longer have to either know or pre-define every single piece of data that you will possibly "need to store" for your application. You expand your data set as you go and add the new attributes only when they are absolutely needed. SimpleDB enables you to do this easily, and even the indexing for these newly-added attributes is automatically handled behind the scenes without any need for your intervention.
Create high-performance web applications
High-performance web applications need the ability to store and retrieve data in a fast and efficient way. Amazon SimpleDB provides your applications with this ability while removing a lot of the administrative and maintenance complexities, leaving you free to focus on what's important to you—your application.
Take advantage of lower costs
You pay only for the SimpleDB resources that you actually consume, and you no longer need to lay out significant expenditures up front for database software licenses or even hardware. The capacity planning and handling of any spikes in load and traffic are automatically handled by Amazon, freeing valuable resources that can be deployed in other areas. SimpleDB pricing passes on to you the cost savings achieved by Amazon's economies of scale.
Scale your applications on demand
And last but most importantly, you can easily handle traffic and load spikes on your applications, as SimpleDB will be doing all of the heavy lifting and scaling for you. You can even handle the massive and tsunami-like increases in traffic that can result from being mentioned on the front page of Yahoo or Digg, or becoming a trendy topic on Twitter.
Architect for the cloud
SimpleDB is designed to integrate easily and work well with the other cloud services from Amazon such as Amazon EC2 and Amazon S3. This enables you to take full advantage of these other services and offload data processing and file storage needs to the cloud, while still using SimpleDB for your structured data storage needs. Web-scale computing for your application needs along with cost-effectiveness is easier thanks to these cloud services.