CODEWITHSUNDEEP
amazon-dynamodb
user2224280
user2224280

Reputation: 29

Data consistency in DynamoDB

I want to use DynamoDB for a large scale service which would be accessed by many users within a second. I want to know how correct would be the read data from DynamoDb which provides "Eventual Consistent" reads.

This link http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/APISummary.html says "Consistency across all copies of the data is usually reached within a second". I haven't tried testing SQL DBs for such highly accessed databases, but the service provided by DynamoDB doesn't seem to be better at least.

The strongly consistent read is costly and may take more time, so I prefer the normal reads. If necessary I'll have to check for strongly consistent read.

I am little bit afraid of the "Eventual" word. Has anyone seen such a scenario where DynamoDB is being successfully used or the other way round, i.e. the inconsistent results read were found ?

Upvotes: 0

Views: 1020

Answers (1)

prestomation
prestomation

Reputation: 7440

Can you talk about your usecase a little more?

For many use cases, when end users are just reading data out of the table it's not crucial that the data be exact and update to date right to the second..especially if you can save 50% on read throughput costs by using eventually consistent reads. If you NEED consistent reads...then use consistent reads.

I generally use eventually consistent reads in my application and have never noticed an occurrence of inconsistent data. I only use strongly consistent reads when my application needs it.

Upvotes: 0

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