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I've been a little wary of the MongoHQ option because it's a separate service and I was worried about latency. But, I guess if it's all hosted on EC2 that doesn't matter as much...?

Does anyone have any experience using MongoHQ on Heroku?

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Yes, we are running MongoHQ with Heroku and so far, it's been great. Tool-wise, not great, but been told that it will get better.

Yup. For a social web app.. using PostgreSQL for high-value, low-volume authoritative data and MongoDB for high-volume, low-value non-authoritative data (like news feed items). Works like a charm.

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