Dataspaces Explained

Dataspaces are an abstraction in data management that aims to overcome some of the problems encountered in a data integration system. The aim is to reduce the effort required to set up a data integration system by relying on existing matching and mapping generation techniques, and to improve the system in "pay-as-you-go" fashion as it is used.^{[1] [2]} Labor-intensive aspects of data integration are postponed until they are absolutely needed.^[3]

Traditionally, data integration and data exchange systems have aimed to offer many of the purported services of dataspace systems.Dataspaces can be viewed as a next step in the evolution of data integration architectures, but are distinct from current data integration systems in the following way. Data integration systems require semantic integration before any services can be provided. Hence, although there is not a single schema to which all the data conforms and the data resides in a multitude of host systems, the data integration system knows the precise relationships between the terms used in each schema. As a result, significant up-front effort is required in order to set up a data integration system.^[4]

Dataspaces shift the emphasis to a data co-existence approach providing base functionality over all data sources, regardless of how integrated they are. For example, a DataSpace Support Platform (DSSP) can provide keyword search over all of its data sources, similar to that provided by existing desktop search systems. When more sophisticated operations are required, such as relational-style queries, data mining, or monitoring over certain sources, then additional effort can be applied to more closely integrate those sources in an incremental fashion. Similarly, in terms of traditional database guarantees, initially a dataspace system can only provide weaker guarantees of consistency and durability. As stronger guarantees are desired, more effort can be put into making agreements among the various owners of data sources, and opening up certain interfaces (e.g., for commit protocols).^{[5] [6]}

See also

• Data integration
• Data mapping
• Information integration
• Linked data
• Semantic integration
• Semantic query

Further reading

• Partha Pratim Talukdar, Marie Jacob, Muhammad Salman Mehmood, Koby Crammer, Zachary G. Ives, Fernando Pereira, Sudipto Guha: Learning to create data-integrating queries. PVLDB 1(1): 785-796 (2008)
• Michael J. Franklin, Alon Y. Halevy, David Maier: A first tutorial on dataspaces. PVLDB 1(2): 1516-1517 (2008)
• Jens-Peter Dittrich, Marcos Antonio Vaz Salles: iDM: A Unified and Versatile Data Model for Personal Dataspace Management. VLDB 2006: 367-378.

Notes and References

1. Belhajjame . K. . Paton . N. W. . Norman Paton. Embury . S. M. . Fernandes . A. A. A. . Hedeler . C. . Incrementally improving dataspaces based on user feedback . 10.1016/j.is.2013.01.006 . Information Systems . 38 . 5 . 656 . 2013 . 10.1.1.303.1957 .
2. Belhajjame . K. . Paton . N. W. . Norman Paton. Embury . S. M. . Fernandes . A. A. A. . Hedeler . C. . 10.1145/1739041.1739110 . Feedback-based annotation, selection and refinement of schema mappings for dataspaces . Proceedings of the 13th International Conference on Extending Database Technology - EDBT '10 . 573 . 2010 . 9781605589459. 10.1.1.298.3519 .
3. Book: Dong . X. . Halevy . A. . 10.1145/1247480.1247487 . Indexing dataspaces . Proceedings of the 2007 ACM SIGMOD international conference on Management of data - SIGMOD '07 . 43 . 2007 . 9781595936868 . 1184444 .
4. Book: Howe . B. . Maier . D. . Rayner . N. . Rucker . J. . Quarrying dataspaces: Schemaless profiling of unfamiliar information sources . 10.1109/ICDEW.2008.4498331 . 2008 IEEE 24th International Conference on Data Engineering Workshop . 270 . 2008 . 978-1-4244-2161-9 . 14039616 .
5. Book: Sarma . A. D. . Dong . X. (L. . Halevy . A. Y. . 10.1007/978-3-642-02463-4_8 . Data Modeling in Dataspace Support Platforms . Conceptual Modeling: Foundations and Applications . Lecture Notes in Computer Science . 5600 . 122–138 . 2009 . 978-3-642-02462-7 .
6. Franklin . M. . Halevy . A. . Maier . D. . 10.1145/1107499.1107502 . From databases to dataspaces . ACM SIGMOD Record . 34 . 4 . 27 . 2005 . 14092111 .