How is the condition database accessed?įor CMS Open Data, the condition data are provided as sqlite files in the /cvmfs// file system and, if needed, are available for download from the corresponding records on this portal. Examples of such analyses are the jet energy correction (JEC) reading in "Physics Object Extractor Tool (POET)" or getting the trigger information. However, access to the condition database is necessary, for example, for jet energy corrections, b-tagging variables and trigger configuration information. Examples of such analyses are the di-muon spectrum example or the Higgs analysis example. Therefore, simple analyses do not need to access the condition database. Most AOD and MINIAOD physics objects in the CMS Open Data are already calibrated and ready-to-use, and no additional corrections are needed other than selection and identification criteria, which will be applied in the analysis code. Condition data include non-event-related information (Alignment, Calibration, Temperature, etc.) and parameters for the simulation/reconstruction/analysis software. These records are stored in the condition database. The Global Tag is defined for each data-taking period, separately for collision and simulated data. This page explains the use of global tags and the condition database with the CMS Open Data.Ī Global Tag is a coherent collection of records of additional data needed by the reconstruction and analysis software. Accessing condition data from the CMS Open Data containers.Accessing condition data from the CMS Open Data VM image. How is the condition database accessed?.
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