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That gets tricky if one of the writes fails.

Generally you get two phase commit involved here, or an asynch mirror that you can restore over if there's failure.

Two phase commit makes a promise it can't keep. CAP theorem is not amused.

It's slow, complex, a leaky abstraction, and ahould be avoided for better consistency models.

I generally couldn't agree more, but yet its the first tool in the toolbox for a lot of databases.