99.99% of the time the error you are getting means ORACLE_HOME is not set. I see you've attempted to set it in unixODBC but I'd suggest you set it in your shell and export it and retry as the unixODBC syntax ini file syntax is relatively recent.

In reply to Re: Problem connecting to Oracle on AIX via ODBC by mje
in thread Problem connecting to Oracle on AIX via ODBC by mj10044

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