>
> In the asynchronous commit documentation, it says:
>
> *The commands supporting two-phase commit, such as PREPARE TRANSACTION,
> are also always synchronous
> *
>
> Does this mean that all queries that are part of a distributed transaction
> are synchronous?
>
Yep
> In our databases we have extremely high disk I/O, I'm wondering if
> distributed transactions may be the reason behind it.
>
could be, but you have to send us more info about your setup, your
configuration , especially your io settings, output of vmstats would also
be helpful
> Thanks
>
>
Vasilis Ventirozos