Hi all
I have a virtuoso instance (Version 7.0.0.3203-pthreads as of Sep 13
2013) over a VM, 32 Gb RAM, Intel(R) Xeon(R) CPU X5680 @ 3.33GHz.
CentOS release 6.3
From time to time I have to restart that server, and when I start
virtuoso the performance is not good, for example for a particular query
[1] I got 23035 ms.
But If I restart virtuoso again, for the same query I got 643 ms ....
There is no additional information on the logs
AFAIR I didn't have this behavior on a physical server ...
do you have any idea why this is happening?
Apologies if the question is a bit trivial.
Best
Boris
[1] SELECT DISTINCT ?author2 ?authorName
WHERE {
<...id1> ex:p1 ?authorship.
?authorship ex:p2 ?author.
?author ex:p3 ?authorship2 .
?authorship2 ex:p4 ?resource .
?resource ex:p1 ?authorship3 .
?authorship3 ex:p2 ?author2 .
?author2 rdfs:label ?authorName
FILTER not
EXISTS {
?author2 ex:p3 ?authorshipN.
<...id1> ex:p1 ?authorshipN.
}} order by ?authorName
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