Marcin,

> I have two TIB_Connections pointing to two separate DBs.
> Each IB_Connection has separate read-only TIB_Transaction.
>
> Since this is some kind of replication application, I'd like to use two
> phase commit feature...
>
> Would it be enough to put another TIB_Transaction and set IB_Connection1
> and IB_Connection2 accordingly and then use it in all IB_DSQLs?
> Or do I have to do something more?

No. It's as simple as that.

Regards,
Jason Wharton