[Ruby] Parallel migration

[Alex Vollmer]

Okay, I've got a rather esoteric question about ActiveMigrations. Does
anyone know of an existing solution to run parts of your migration in
parallel? For example we have some ALTER TABLE commands that are changing
the column type for some large tables. By default each ALTER command is
executed one after the other which is pretty slow. But some of the tables
aren't directly related to each other so it's possible to run the
alterations in parallel to take advantage of the multiple procs on the DB
server. I'm not sure I really want to do this, but I was curious if anyone
knew anything about it.

TIA,

Alex V.

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