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Event Indexing Systems for Efficient Selection and Analysis of HERA Data | | L.A.T. Bauerdick
; Adrian Fox-Murphy
; Tobias Haas
; Stefan Stonjek
; Enrico Tassi
; | | Date: |
3 Apr 2001 | | Journal: | Comput.Phys.Commun. 137 (2001) 236-246 | | Subject: | Databases; Information Retrieval ACM-class: H.2.4; H.3.1; H.3.3; H.3.4; J.2; H.2.8 | cs.DB cs.IR | | Abstract: | The design and implementation of two software systems introduced to improve the efficiency of offline analysis of event data taken with the ZEUS Detector at the HERA electron-proton collider at DESY are presented. Two different approaches were made, one using a set of event directories and the other using a tag database based on a commercial object-oriented database management system. These are described and compared. Both systems provide quick direct access to individual collision events in a sequential data store of several terabytes, and they both considerably improve the event analysis efficiency. In particular the tag database provides a very flexible selection mechanism and can dramatically reduce the computing time needed to extract small subsamples from the total event sample. Gains as large as a factor 20 have been obtained. | | Source: | arXiv, cs.DB/0104008 | | Services: | Forum | Review | PDF | Favorites | |
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