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A comment on Google Cloud Spanner is now half the cost of Amazon DynamoDB. Parent comment
Once you have millions of messages, maybe consider moving the data intensive parts out if postgres, if necessary.
The criticism is often that people look for big data solutions, before they have big data.
If you scale out of postgres, you probably have enough users and money that you can fix it :)
But moving to a NoSQL before you have to, might just slow down development velocity -- also you haven't yet learned what patterns users have.
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Once you have millions of messages, maybe consider moving the data intensive parts out if postgres, if necessary.
The criticism is often that people look for big data solutions, before they have big data.
If you scale out of postgres, you probably have enough users and money that you can fix it :)
But moving to a NoSQL before you have to, might just slow down development velocity -- also you haven't yet learned what patterns users have.