protected function attempt_oci_package_install() {
        $sqls = file_get_contents(__DIR__.'/oci_native_moodle_package.sql');
        $sqls = preg_split('/^\/$/sm', $sqls);
        foreach ($sqls as $sql) {
            $sql = trim($sql);
            if ($sql === '' or $sql === 'SHOW ERRORS') {
                continue;
            }
            $this->change_database_structure($sql);
        }
    }