SCHEMA EVOLUTION FOR STARS AND SNOWFLAKES

Christian E. Kaas, Torben Bach Pedersen, Bjørn D. Rasmussen

2004

Abstract

The most common implementation platform for multidimensional data warehouses is RDBMSs storing data in relational star and snowflake schemas. DW schemas evolve over time, which may invalidate existing analysis queries used for reporting purposes. However, the evolution properties of star and snowflake schemas have not previously been investigated systematically. This paper systematically investigates the evolution properties of star and snowflake schemas. Eight evolution operations are considered, covering insertion and deletion of dimensions, levels, dimension attributes, and measure attributes. For each operation, the formal semantics of the changes for star and snowflake schemas are given, and instance adaption and impact on existing queries are described. Finally, we compare the evolution properties of star and snowflake schemas, concluding that the star schema is considerably more robust towards schema changes than the snowflake schema.

Paper Citation

in Harvard Style

E. Kaas C., Bach Pedersen T. and D. Rasmussen B. (2004). SCHEMA EVOLUTION FOR STARS AND SNOWFLAKES . In Proceedings of the Sixth International Conference on Enterprise Information Systems - Volume 1: ICEIS, ISBN 972-8865-00-7, pages 425-433. DOI: 10.5220/0002619704250433

in Bibtex Style

@conference{iceis04,
author={Christian E. Kaas and Torben Bach Pedersen and Bjørn D. Rasmussen},
title={SCHEMA EVOLUTION FOR STARS AND SNOWFLAKES},
booktitle={Proceedings of the Sixth International Conference on Enterprise Information Systems - Volume 1: ICEIS,},
year={2004},
pages={425-433},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0002619704250433},
isbn={972-8865-00-7},
}

in EndNote Style

TY - CONF
JO - Proceedings of the Sixth International Conference on Enterprise Information Systems - Volume 1: ICEIS,
TI - SCHEMA EVOLUTION FOR STARS AND SNOWFLAKES
SN - 972-8865-00-7
AU - E. Kaas C.
AU - Bach Pedersen T.
AU - D. Rasmussen B.
PY - 2004
SP - 425
EP - 433
DO - 10.5220/0002619704250433