Oracle, a major Silicon Valley tech company, will move its annual OpenWorld conference to Las Vegas next year over concerns about San Franciscos hotel rates and the citys poor street conditions, according to reports. The loss of OpenWorld, which has been held in San Francisco for about 20 years, is raising new concerns about whether the citys struggles with homelessness, open drug use and street violence may be scaring off tourism and other business, the San Francisco Chronicle reported.