The ATLAS experience with databases for structured data with temporal and hierarchical order

Developing systems for the A Turoidal LHC Aparattus (ATLAS) detector at LHC poses a new set of challenges like the storage of great amounts of data with different structures. This data can be not only from the conditions data which is slowly evolving data but also data from the online systems which cannot be stored with the event data and must be accessible from each event. Following the requirements from such systems we have developed a system which provides the facility to store data with structure in a temporal evolution and with the possibility to classify in a hierarchical order. We will also make a case study of use in the online systems of the ATLAS experiment where this system was used to store online data. Furthermore, we will expose the different interfaces developed for this system and its use in different areas of application