3.3.12 Memory management considerations
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Availability::- use_module(library(semweb/rdf_db)).
Source[det]rdf_update_duplicates
Update the duplicate administration of the RDF store. This marks every triple that is potentionally a duplicate of another as duplicate. Being potentially a duplicate means that subject, predicate and object are equivalent and the life-times of the two triples overlap.

The duplicates marks are used to reduce the administrative load of avoiding duplicate answers. Normally, the duplicates are marked using a background thread that is started on the first query that produces a substantial amount of duplicates.