- Keys are no longer supposed to be small, integer, incrementing for performance.
- Keys are long strings, sometimes with pipe delimiters.
- There is no concept of ATOMIC transactions - the app does the work.
- A table can hold two different types of object information (invoice/invoice details) with the key differentiating. Duplicate data is replicated everywhere.
- Message Queues have a chance of dropping data which the app needs to handle.
- There are limits to the scalability of requests and storage size that the app needs to be aware of and design around.
- There's only 1 key on a table, so searching against a non-partition-key field causes table scans.
- It's better to update / merge data than to append to the end.
The cloud will scale to terabytes, petabytes, exabytes of data depending on your budget, however good luck doing any complex searches against your metadata. Seems rather painful right now.
Many of the stable, reliable, tried-and-true server and developer tools available outside the "cloud" provide a huge step up in terms of ease of development effort and data quality. Why are we taking steps backwards in development to accommodate buzzwords and marketing stories? Is there really a great benefit to moving your enterprise into the cloud?
Cloud in simple words is 'Pay as you use'. Cloud computing is analogous to the way we pay for our utilities like electricity or water based on the consumption. The underlying Infrastructure is owned and managed by some third party and cost is billed to us in form of units consumed - BI In the Cloud
Driving around eastern Ontario a couple weekends ago, I was amazed by all the farms and houses having solar panels that weren't there last year. I told my wife some salesperson was doing a good job. This type of micropower distribution structure seems like the way of the future; not a huge smoke-belching power plant. Why isn't it the same for the cloud?
The thing that bothered me the most though? MS has Azure Cloud Data Centers around the world. But no Azure Cloud Data Centres, eh? I guess Canada is considered Northern US to the Redmond folks... :)