Database maker Clustra Systems has received a $19 million second round of funding. Clarity Capital and Mustang Ventures served as lead investors and were joined by VantagePoint Venture Partners and Telesystem-Argo Global Capital. Both VantagePoint and Telesystem-Argo participated in the $10 million first round, bringing the Oakland, Calif.-based company's total investment to $29 million. Clustra sells databases to companies with customers who need constant access to information, such as phone companies or ATM-machine companies. Clustra plans to use some of the funds to develop database software that programmers can use in Net appliances.