> If two people go to the same rails application (same directory) and
> both run "rake db:migrate" to update the database with a set of
> migrations (the same ones) at the same time, is it likely that bad
> things will happen to the data, or will db:migrate do something to
> prevent the same migration from being run by more than one
> (simultaneous) process?

rake db:migrate is only tuned for one development workstation.

Are you implying your developers don't have individual databases?

In my experience running various rake commands accidentally at the same 
time, one batch will "win", and the other will cough up a zillion errors and 
expire gracelessly... 




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