ATLAS Conditions Database Experience With the Cool Project

The COOL conditions database will be one of the most challenging and heavily used database applications for ATLAS, both in terms of data volumes and rates, but also in the variety of data stored. One of most challenging tasks in the ATLAS experiment will be the storage of non-event data produced by calibration and alignment stream processes into the Conditions Database at the Tier0 (located at CERN) using the COOL technology. In this work, the ATLAS Conditions Database and the conditions data (in particular the data coming from the calibration and alignment processes) are described.