Hi,
A previous thread about TDB disk usage
(https://markmail.org/message/u45e63nmwkqnsykc) says: "Nodes are not
garbage collected so old blank nodes (and unused URIs and literals)
remain in the node table."
As we're deleting & re-inserting data into named graphs (where often
the end result is no change in triples), we've observed growth of
indexes GOSP, GPOS, GSPO, OSPG, POSG and SPOG. But not: GOSP, GPOS &
GSPO.
I can reproduce this (v4.5.0) with by repeatedly running:
DELETE { GRAPH ?g { ?s ?p ?o } }
INSERT { GRAPH ?g { ?s ?p ?o } }
WHERE {
VALUES ?g { some:graph }
VALUES (?s ?p ?o) {
# Set of 1000 fixed triples with URI objects
}
}
Is that expected behaviour, i.e. that the indexes and not just the
node table will grow? (Or maybe I have misunderstood the definition of
"node table")
And: Is there a reason why GOSP, GPOS & GSPO don't grow with such a
delete/insert clause?
(I appreciate that TBD2 offers compaction and TDB space could be
reclaimed by re-creating the database.)
Regards,
Vilnis
--
Vilnis Termanis
Technical Specialist
e | [email protected]
www.iotics.com
