Oracle is hosting one of the largest conventions of the year in San Francisco.
Oracle Open World started Sunday at the Moscone Center. About 60,000 people are expected to attend the five-day convention at the Moscone Center.
The convention showcases Oracle's latest database management software. It also features more than 500 booths from other computer makers, consultants and start-ups.
Mayor Ed Lee kicked off the convention.
"Oracle has been...a wonderful, wonderful partner," Lee said. "This Moscone Center...we've renovated it, we've expanded it. We're under a current expansion to host your convention and watch it grow, and by the way, I don't mind closing down Howard Street for you."
Several other streets around the Moscone Center are also shut down and traffic will likely be a mess.
The convention runs through Thursday.