I’m working on wrapping my head around the idea of NoSQL databases. My goal is to ensure quick read times, even if data is eventually consistent. The biggest concern I have has to do with denormalized data. If I have some of the same data in two or more documents and I update a portion of the data that is shared between the two then I want to update both. I worry what would happen if I update one and then a power outage occurs before I update the other.
I don’t think transactions will work because there is a chance that I’d have to update hundreds or thousands of documents with shared data under a single transaction and that sounds ill advised.
I could use a separate messaging system that guarantees at least once delivery, but that also sounds complicated having to figure out the order of messages and possible duplicated messages.
I’m trying to write a web application here, probably using either MongoDB, Google Datastore, or Amazon DynamoDB for data storage. Am I over thinking this? Is there any easy way to guarantee denormalized eventually consistent data?
Thanks for the help.
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