First experience in operating the population of the condition databases for the CMS experiment
First experience in operating the population of the condition databases for the CMS experiment
复制标题
首次操作 CMS 实验条件数据库群体的经验
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
D. Schlatter
中科院分区：
文献类型：
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作者：
M. Gruttola;S. Guida;F. Glege;V. Innocente;P. Paolucci;D. Futyan;Giacomo;Govi;A. Pierro;D. Schlatter
可靠的条件数据库填充对于在线选择以及离线重建和数据分析的正确操作至关重要。在这里，我们将描述在CMS实验中放置的系统，以填充数据库并使条件数据迅速在线用于高级触发和离线重建。该系统设计为具有很高的灵活性，以处理非常不同的数据源，使用POOL-ORA技术，以便以与CMS离线软件中使用的C++编程语言的面向对象范例最匹配的对象格式存储数据。为了确保各个子检测器之间的一致性，使用了一个专用的包PopCon(条件对象的填充器)来在线存储数据。然后，数据自动流到离线数据库，从而立即可以在全球范围内离线访问。这一机制在2008年的宇宙射线试运行中得到了广泛的应用。将详细讨论这一头几个月的运营经验。
Reliable population of the condition databases is critical for the correct operation of the online selection as well as of the offline reconstruction and analysis of data. We will describe here the system put in place in the CMS experiment to populate the database and make condition data promptly available both online for the high-level trigger and offline for reconstruction. The system, designed for high flexibility to cope with very different data sources, uses POOL-ORA technology in order to store data in an object format that best matches the object oriented paradigm for C++ programming language used in the CMS offline software. In order to ensure consistency among the various subdetectors, a dedicated package, PopCon (Populator of Condition Objects), is used to store data online. The data are then automatically streamed to the offline database hence immediately accessible offline worldwide. This mechanism was intensively used during 2008 in the test-runs with cosmic rays. The experience of this first months of operation will be discussed in detail.