- rdf_statistics(?KeyValue) is nondet
- Obtain statistics on the RDF database. Defined statistics are:
- graphs(-Count)
- Number of named graphs.
- triples(-Count)
- Total number of triples in the database. This is the number
of asserted triples minus the number of retracted ones. The
number of visible triples in a particular context may be
different due to visibility rules defined by the logical
update view and transaction isolation.
- resources(-Count)
- Number of resources that appear as subject or object in a
triple. See rdf_resource/1.
- properties(-Count)
- Number of current predicates. See rdf_current_predicate/1.
- literals(-Count)
- Number of current literals. See rdf_current_literal/1.
- gc(GCCount, ReclaimedTriples, ReindexedTriples, Time)
- Information about the garbage collector.
- searched_nodes(-Count)
- Number of nodes expanded by rdf_reachable/3 and
rdf_reachable/5.
- lookup(rdf(S,P,O,G),Count)
- Number of queries that have been performed for this particular
instantiation pattern. Each of S,P,O,G is either + or -.
Fails in case the number of performed queries is zero.
- hash_quality(rdf(S,P,O,G),Buckets,Quality,PendingResize)
- Statistics on the index for this pattern. Indices are created
lazily on the first relevant query.
- triples_by_graph(Graph, Count)
- This statistics is produced for each named graph. See
triples for the interpretation of this value.
