Event Indexing Systems for Efficient Selection and Analysis of HERA Data

Details Event Indexing Systems for Efficient Selection and Analysis of HERA Data Event Indexing Systems for Efficient Selection and Analysis of HERA Data

2001-04-03

arxiv.org/abs/cs/0104008v1

Comput.Phys.Commun. 137 (2001) 236-246

Computer Science

Databases

Accepted for publication in Computer Physics Communications

Scientific paper

10.1016/S0010-4655(01)00162-X

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.

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