$dbh->do(q(ALTER SESSION SET NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS');
    $dbh->do(q(ALTER SESSION SET NLS_TIMESTAMP_FORMAT='YYYY-MM-DD HH24:MI:SSxFF');
    $dbh->do(q(ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT='YYYY-MM-DD HH24:MI:SSxFF');