So ODBC doesn't think that a data source does not exist under that name conexao220.

If you are really, really sure that the name should exist, then my next guess is that you created the DSN under Windows 32bit ODBC (C:\Windows\System32\odbcad32.exe) but are using a 64bit Perl, or you created the DSN under Windows 64bit ODBC (C:\Windows\SysWOW64\odbcad32.exe), but are using a 32bit Perl.

I would create two DSNs, conexao220-32 and <c>conexao220-64, using the two different programs and then check using the different Perl versions to find out which one can connect.

In reply to Re^12: DBI connect to Oracle by Corion
in thread DBI connect to Oracle by Anonymous Monk

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