Server Architectures: Multiprocessors, Clusters, Parallel Systems, Web Servers, Storage Solutions
Server Architectures: Multiprocessors, Clusters, Parallel Systems, Web Servers, Storage Solutions
Journal of Biomedical Informatics
Pivoted table index for querying product-property-value information
Proceedings of the 3rd International Conference on Ubiquitous Information Management and Communication
A statistical metadata model for clinical trials' data management
Computer Methods and Programs in Biomedicine
COVER model pivot view indexing for efficient XML data management
Proceedings of the 2010 Conference of the Center for Advanced Studies on Collaborative Research
Integrating healthcare-related information using the entity-attribute-value storage model
HIS'12 Proceedings of the First international conference on Health Information Science
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Entity-Attribute-Value (EAV) data, as present in repositories of clinical patient data, must be transformed (pivoted) into one-column-per-parameter format before it can be used by a variety of analytical programs. Pivoting approaches have not been described in depth in the literature, and existing descriptions are dated. We describe and benchmark three alternative algorithms to perform pivoting of clinical data in the context of a clinical study data management system. We conclude that when the number of attributes to be returned is not too large, it is feasible to use static SQL as the basis for views on the data. An alternative but more complex approach that utilizes hash tables and the presence of abundant random-access-memory can achieve improved performance by reducing the load on the database server.