CMS Online Database Experience with First Data

Abstract

The CMS experiment at the LHC at CERN is made of many detectors with more than 60 million channels in total. The detector properties are controlled and monitored continuously by the Detector Control System (DCS) in order to ensure the stability and precision required by its design. This leads to a large data volume to be accessed continuously by people on shift, experts, automatic monitoring tasks, detector configuration programs for trigger and data acquisition systems and offline data reconstruction programs