[Rails] How many connection pool should we have for internet facing apps?

Hi all,

This is a rather basic question about connection pooling in ruby on
rails. In rails we can define the connection pool in database.yml. I
assume it is quite safe to hardcode this value for intranet
application since we would know how many users that will be using the
apps. But for an internet facing apps where we don't know how many
users that will be accessing the app, how many connection pool should
we provide ? Can anyone share their experience on this to enlighten
me?

Thank you very much in advance for the insights.

Kind regards,
Joshua

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