Today, the costs of data redundancy have decreased to some extent. Being able to more efficiently store data in tables "eliminated much data storage and provided much more flexible data access" (Data redundancy, 2010, Logic). Controlled redundancy with careful limits on unauthorized access can eliminate the problem of data inconsistency and having one set of data altered but not the other. According to Junhu Wan's 2006 article "Binary equality implication constraints, normal forms and data redundancy," inconsistent "redundancies can be prevented if the instances of the two relation schemas do not contain overlapping information," and thus the benefits that can be accrued from redundancies may outweigh their detriments (Wan 2006, p.2).
References
Data redundancy. (2010). Computing students. Retrieved October 17, 2010 at http://www.computingstudents.com/dictionary/?word=Data%20Redundancy
Data redundancy. (2010). Logic data UK. Retrieved October 17, 2010 at http://www.logicdata.co.uk/data-security/Data-Redundancy/data-redundancy-dbms/
Wan, Junhu. (2006). Binary equality implication constraints, normal forms and data redundancy.
Retrieved October 17, 2010 at citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.114.3912.
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