This error is nearly always that ORACLE_HOME is not set properly and sometimes missing/incorrect NLS environment variables. You have:

ORACLE_HOME=/ora00/app/oracle/product/11.2.0/db_1
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are you absolutely sure that is correct? You don't seem to have any NLS_LANG settings either and your TZ looks wrong.

When you create a database Oracle creates a shell script you can run to set your environment properly. It does not look like you've run it.

Apart from that the versions of DBI and DBD::Oracle and Perl are very old now so I presume you are using them for a good reason.