Loading sentences and show on dataframe shiny R (PT/BR)

Guys, I'm having a problem displaying a sentence in a datatable in Portuguese Brazil.
When I send dbGetQuery() it returns replacing special characters with "?".

in the oracle database it is like this:
"Não tenho cartão de credito"

when I will display in the datatable:
"N?o tenho cart?o de credito"

I solve this setting this ENV VAR on my dockerfile


I was using ROracle database for Portuguese sentences.

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