framework/db/oci/Schema.php
public function init()
    {
        parent::init();
        if ($this->defaultSchema === null) {
            $username = $this->db->username;
            if (empty($username)) {
                $username = isset($this->db->masters[0]['username']) ? $this->db->masters[0]['username'] : '';
            }
            $this->defaultSchema = strtoupper($username);
        }
    }
public function init()
    {
        parent::init();
        if ($this->defaultSchema === null) {
            $username = $this->db->username;
            if (empty($username)) {
                $username = isset($this->db->masters[0]['username']) ? $this->db->masters[0]['username'] : '';
            }
            $this->defaultSchema = strtoupper($username);
        }
    }
{@inheritdoc}