SHAMROCK HOLDINGS UNIT AQUIRES SOFTWARE COMPANY <Shamrock Holdings Inc> said its subsidiary, Shamrock Holdings of California, acquired controlling interest in <DBMS Inc> through the purchase of 575,000 shares of its preferred stock. The company said the stock was purchased for an undisclosed amount from an unnamed group of investors. Shamrock said Raymond Nawara, a former executive vice president of DBMS, a privately-held software company, also granted it options and voting rights on a major portion of his shares of common stock. The combination of preferred and common stock holdings permit Shamrock and Nawara to exercise voting control over approximately 53 pct of the shares of the company. Shamrock also said Nawara has been elected president of DBMS and one of its directors.