The CMS Condition Database System

21st International Conference on Computing in High Energy and Nuclear Physics

物理学;计算机科学

Di Guida, S.^1 ; Govi, G.^2 ; Ojeda, M.^3 ; Pfeiffer, A.^3 ; Sipos, R.^4

Università degli Studi Guglielmo Marconi, Rome, Italy^1

Fermi National Accelerator Laboratory, Batavia

IL, United States^2

CERN, Geneva, Switzerland^3

Eotvos Lorand University, Budapest, Hungary^4

关键词: Binary data;    Computing infrastructures;    Data type;    Database schemas;    Relational features;    Sub-systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/664/4/042024/pdf
DOI  :  10.1088/1742-6596/664/4/042024

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The Condition Database plays a key role in the CMS computing infrastructure. The complexity of the detector and the variety of the sub-systems involved are setting tight requirements for handling the Conditions. In the last two years the collaboration has put a substantial effort in the re-design of the Condition Database system, with the aim at improving the scalability and the operability for the data taking starting in 2015. The re-design has focused on simplifying the architecture, using the lessons learned during the operation of the Run I data-taking period (20092013). In the new system the relational features of the database schema are mainly exploited to handle the metadata (Tag and Interval of Validity), allowing for a limited and controlled set of queries. The bulk condition data (Payloads) are stored as unstructured binary data, allowing the storage in a single table with a common layout for all of the condition data types. In this paper, we describe the full architecture of the system, including the services implemented for uploading payloads and the tools for browsing the database. Furthermore, the implementation choices for the core software will be discussed.