Are you an EPFL student looking for a semester project?
Work with us on data science and visualisation projects, and deploy your project as an app on top of GraphSearch.
Concept
Heterogeneous database system
Summary
A heterogeneous database system is an automated (or semi-automated) system for the integration of heterogeneous, disparate database management systems to present a user with a single, unified query interface.
Heterogeneous database systems (HDBs) are computational models and software implementations that provide heterogeneous database integration.
This article does not contain details of distributed database management systems (sometimes known as federated database systems).
Different s, access protocols, query languages etc. Often called syntactic heterogeneity from the point of view of data.
Different ways of representing and storing the same data. Table decompositions may vary, column names (data labels) may be different (but have the same semantics), data encoding schemes may vary (i.e., should a measurement scale be explicitly included in a field or should it be implied elsewhere). Also referred as schematic heterogeneity.
Data mapping
Semantic heterogeneity
Semantic integration
Data across constituent databases may be related but different. Perhaps a database system must be able to integrate genomic and proteomic data. They are related—a gene may have several protein products—but the data are different (nucleotide sequences and amino acid sequences, or hydrophilic or -phobic amino acid sequence and positively or negatively charged amino acids). There may be many ways of looking at semantically similar, but distinct, datasets.
The system may also be required to present "new" knowledge to the user. Relationships may be inferred between data according to rules specified in domain ontologies.
Official source
About this result
This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.