CERN Accelerating science

CMS Note
Report number	CMS-CR-2010-144
Title	Time-Critical Database Conditions Data-Handling for the CMS Experiment
Author(s)	De Gruttola, M (INFN, Naples ; Naples U. ; CERN) ; Di Guida, S (CERN) ; Innocente, V (CERN) ; Pierro, A (INFN, Bari)
Collaboration	for the CMS Collaboration
Publication	2011
Imprint	24 Aug 2010
Number of pages	6
In:	IEEE Trans. Nucl. Sci. 58, 4, Part 1 (2011) pp.1460-1464
In:	17th IEEE NPSS Real Time Conference, Lisbon, Portugal, 24 - 28 May 2010, pp.1460-1464
In:	17th IEEE NPSS Real Time Conference (Conference Record), Lisbon, Portugal, 24 - 28 May 2010, pp.5750484
DOI	10.1109/TNS.2011.2155084 10.1109/RTC.2010.5750484
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	Automatic, synchronous and of course reliable population of the condition database is critical for the correct operation of the online selection as well as of the offline reconstruction and data analysis. We will describe here the system put in place in the CMS experiment to automate the processes to populate centrally the database and make condition data promptly available both online for the high-level trigger and offline for reconstruction. The data are ``dropped{''} by the users in a dedicated service which synchronizes them and takes care of writing them into the online database. Then they are automatically streamed to the offline database, hence immediately accessible offline worldwide. This mechanism was intensively used during 2008 and 2009 operation with cosmic ray challenges and first LHC collision data, and many improvements were done so far. The experience of this first years of operation will be discussed in detail.
Copyright/License	Preprint: (License: CC-BY-4.0)

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