Hi,

I got introduced to App Engine via the Google Web Toolkit. I set up a
few sample app engine projects to learn about it but am not sure if my
production app will be large enough to justify using GAE, or well
suited for it. A very rough skeleton of the app, if I were to use a
mysql instance with unlimited connections:

-The web app will probably serve about 10,000 users at any given time.
-Every 5 seconds, each client needs to:
    -update some attributes of their user record in the database
(update users set fav_color = blue where user_id = 123)
    -get a list of other user objects on some criteria (select * from
users where fav_color = red limit 100)
    -check for message objects from other users (select * from
messages where recepient_id = 123 and status = unread)

Looks like there's going to be a lot of small but frequent requests.
Is it worth investigating using GAE for this? If it is, with that many/
frequent requests going through, would the billing be extremely high?

I'm very new to large scale applications as you can probably tell, any
advice would be very helpful. I was looking for some type of document
outlining what kind of apps are well suited for GAE vs a mysql/php etc
setup,

Thanks

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