After thinking more on it...

> I could (with FB 2.5 and later) also query with
> RDB$TRANSACTION_DESCRIPTION = X'....' (where X'....' is the serialized Xid
> I am looking for) although I wonder about its performance implications. On
> the other hand, recovery situations should be rare so it might not be
> problematic at all.

    Yes, it could work, but to make it work better we could introduce additional
indexed field to store external XID's and provide a way to supply it at prepare
phase.

Regards,
Vlad 

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