OK, that makes sense--a URI is inherently a key, so when indexed is
easier to look up, while a given literal value is not necessarily, right?
And congrats on the WG finishing up!
Bob
On 12/16/2012 4:41 PM, Andy Seaborne wrote:
On 16/12/12 21:24, Bob DuCharme wrote:
Imagine that I have ten million triples, and these are two of them:
<http://w> rdfs:label "my literal" .
<http://x> <http://y> <http://z> .
I got the impression somewhere that this query
SELECT ?s WHERE { ?s <http://y> <http://z> }
would run faster than this one:
SELECT ?s WHERE { ?s rdfs:label "my literal" }
Is this true, and if so is it because URIs will always be indexed and
literals won't necessarily be?
As far as I know, systems generally index literals - quite important
for keys.
Maybe there are many, many 'rdfs:label "my literal"' if it's not a
key, which might make a difference, as much because there are more
results.
Or is it all dependent on the
implementation?
Yes.
Andy
