Computer Science – Information Theory
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aipc..283..497r&link_type=abstract
The earth and space science information system (ESSIS). AIP Conference Proceedings, Volume 283, pp. 497-502 (1993).
Computer Science
Information Theory
Information Theory And Communication Theory
Scientific paper
We have designed and implemented the Data Management Facility (DMF) as the first generation data archive for the Hubble Space Telescope. The DMF is based on optical disk, jukebox, and relational database technologies. The archive consists of three major subsystems: the archive server, which builds and manages the optical disk data archive, the catalog server, which is a relational database (Sybase) describing the contents of the disk archive, and the User Interface, which manages the user's session displays and interactions with the disk archive and catalog. The DMF is designed as a distributed system using a client-server model, wherein multiple copies of the User Interface communicate with the single copies of the two servers.
This paper is a case study of the DMF project. We show how the requirements for long life (30 years) and the graceful evolution to new technology for databases, archiving media, and network protocols are accommodated and discuss the lessons learned and their implications for future projects of this type. The DMF is the first archive for a space project to provide stable long-term data storage and relatively easy and quick data retrieval for the user. For the approximately 700 MB of new data each day, data archiving and catalog construction is normally completely automated.
We also discuss the design of the DMF catalog and possible pitfalls if a database is designed without using knowledge of its intended use and the underlying nature of the data.
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