LCG Conditions Database Project Overview
Franco, T, Pedro, L, Schmidt, S, N. Barros, A. Amorim, D. Düllmann, Andrea Valassi, Tsulaia, V, Klose, D · CERN Document Server (European Organization for Nuclear Research) · 2005
The LCG Conditions Database project was launched in 2003 in the context of the LHC Computing Grid (LCG) Persistency Framework.The aim of the project is the implementation of a common persistency solution for the storage and management of the conditions data of the LHC experiments at CERN.Conditions data, such as calibration, alignment or slow control data, are non-event experiment data describing the state of the detector at the time of data taking, and are characterized by the fact that they vary in time and may have different versions.The LCG project draws on previous activities that have led to the definition of generic C++ APIs for conditions data access and their implementation using different storage technologies, such as Objectivity, MySQL or Oracle.The project is assigned the task to deliver a production release of the software including implementation libraries for several technologies and high-level tools for data management.This paper reviews the current status of the LCG common project at the time of the CHEP 2004 conference and the plans for its evolution.