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Re: two phase commit

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Ben <bench@xxxxxxxxxxxxxxx> writes:
> I'm reading the description of PREPARE TRANSACTION, and I see this:
> "...its state is fully stored on disk, and there is a very high 
> probability that it can be committed successfully..."

> What corner case reduces 2pc from "guaranteed" to "very high probability"? 

Well, for example, someone drops a nuke on your data center ...

Barring hardware failure, OS failure, or irrecoverable database crash,
the only condition I can think of that would prevent COMMIT PREPARED
from succeeding is out-of-disk-space on the WAL drive.  Which is a PANIC
condition anyway, and thus might be classed with database crashes,
although it's not irrecoverable so long as the admin can free up some
disk space.

			regards, tom lane


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