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Greetings,
we recently did upgrade our project from version 5.x.x unidac to 6.2.9 , after a while we stumbled on some few problems updating and working on tables with OID's set to true getting error "Overflow while converting variant of type (Int64) into type (Integer)", I am kinda surprised why unidac components are trying to retrieve oids as type integer, as-long as I can recall working with postgres, oids always where type bigint hence Int64.

We have checked functionality of UniDAC using PostgreSQL tables with OID's. Unfortunately, we couldn't reproduce the issue. Please compose a complete demo sample reproducing the issue, and send it to us, including a script for creating all the used database objects, for further investigation.