December 2013
Intermediate to advanced
564 pages
19h 54m
English
Content preview from Big Data Computing
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156 Big Data Computing
Enabling access by object. The data structure designed for loading HDT-
encoded data sets, considering a subject-based order, is not suitable for doing
accesses by object. All the occurrence of an object are scattered throughout
the sequence
S
o
and we are not able to locate them unless we do sequential
scan. Furthermore, in this case a structure like the Wavelet Tree becomes
inefcient; RDF data sets usually have few predicates, but they contain many
different objects and logarithmic costs result in very expensive operation.
We enhance HDT-FoQ with an additional index (called O-Index), that is
responsible for
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