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This 3rd part contains best practice No.4 ~ 6. To be notified for the rest, feel free to subscribe to this feed, and follow me at Twitter.

#4 Scale Applications as Needed

Most time, people think scalability is to handle more workload when needed. This is true, but not enough. A truly scalable system should scale back. This is how you will save money. This is equally important as the first case where you get more revenue by serving more traffic.

There are different ways to scale:

• Up and down. This is unique in virtualized environment in which you adjust the memory or CPU allocation and use more or less of them instantly.
• Out & in. This means you include more machines either physical or virtual into your application.

You have to think over several architecture decision points:  Read more... (1601 words, estimated 6:24 mins reading time)