On Thu, Jan 13, 2022 at 04:06:06PM +0200, Achilleas Mantzios wrote: > Dziekuje Alicija. The powerbuilder app is in-house developed, source is > available, what could be wrong with the app? Browsing through the > powerbuilder source I don't see (by eye) anything that could break something > in PgSQL. I would go with option A if possible. If you want to get an idea of how complicated a migration would be, ora2pg does have a migration cost assessment report [1]. It can even check the queries if you have the audit trail enabled on your oracle database (if that existed in that version). [1] https://ora2pg.darold.net/documentation.html#Migration-cost-assessment