LCG Persistency Framework (CORAL, COOL, POOL): Status and Outlook in 2012

• Published in: Journal of physics. Conference series 2012-01, Vol.396 (5), p.52067-9, Article 052067
• Main Authors: Trentadue, R, Clemencic, M, Dykstra, D, Frank, M, Front, D, Kalkhof, A, Loth, A, Nowak, M, Salnikov, A, Valassi, A, Wache, M
• Format: Article
• Language: English
• Subjects: CERN; Computer programs; Corals; Experiments; Materials handling; Physics; Pools; Relational data bases; Software; Software packages; Stores
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/396/5/052067

The LCG Persistency Framework consists of three software packages (CORAL, COOL and POOL) that address the data access requirements of the LHC experiments in several different areas. The project is the result of the collaboration between the CERN IT Department and the three experiments (ATLAS, CMS and LHCb) that are using some or all of the Persistency Framework components to access their data. POOL is a hybrid technology store for C++ objects, using a mixture of streaming and relational technologies to implement both object persistency and object metadata catalogs and collections. CORAL is an abstraction layer with an SQL-free API for accessing data stored using relational database technologies. COOL provides specific software components and tools for the handling of the time variation and versioning of the experiment conditions data. This presentation reports on the status and outlook in each of the three sub-projects at the time of the CHEP2012 conference, reviewing the usage of each package in the three LHC experiments.