3.3.12 Memory management considerations
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Availability::- use_module(library(semweb/rdf_db)).
Source[det]rdf_gc
Run the RDF-DB garbage collector until no garbage is left and all tables are fully optimized. Under normal operation a separate thread with identifier __rdf_GC performs garbage collection as long as it is considered‘useful’.

Using rdf_gc/0 should only be needed to ensure a fully clean database for analysis purposes such as leak detection.