21-27 March 2009
Prague
Europe/Prague timezone

The CMS Offline condition database software system

23 Mar 2009, 14:00
20m
Club A (Prague)

Club A

Prague

Prague Congress Centre 5. května 65, 140 00 Prague 4, Czech Republic
oral Software Components, Tools and Databases Software Components, Tools and Databases

Speaker

Dr Zhen Xie (Princeton University)

Description

Non-event data describing detector conditions change with time and come from different data sources. They are accessible by physicists within the offline event-processing applications for precise calibration of reconstructed data as well as for data-quality control purposes. Over the past three years CMS has developed and deployed a software system managing such data. Object-relational mapping and the relational abstraction layer of the LHC persistency framework are the foundation; the offline condition framework updates and delivers C++ data objects according to their validity. A high-level tag versioning system allows production managers to organize data in hierarchical view. A scripting API in python, command-line tools and a web service serve physicists in daily work. A mini-framework is available for handling data coming from external sources. Efficient data distribution over the worldwide network is guaranteed by a system of hierarchical web caches. The system has been tested and used in all major productions, test-beams and cosmic runs.

Primary authors

Dr Giacomo Govi (Northeastern University) Dr Vincenzo Innocente (CERN) Dr Zhen Xie (Princeton University)

Presentation Materials