On 12/28/15 7:13 AM, Pantelis Natsiavas wrote: > Hi everybody. > > I use a Virtuoso instance installed on ubuntu (Virtuoso version: > 07.20.3214, Build: Oct 14 2015), in order to execute sparql queries. > My queries are quite complex and make heavy use of the "OPTIONAL" > pattern. While I have used the same queries on another virtuoso > endpoint (not controlled by me) I cannot seem to use them on mine. I > keep getting the message > > "Virtuoso 42000 Error The estimated execution time 0 (sec) exceeds the > limit of 18000 (sec)." > > As you see, I have changed the timeout parameters in the virtuoso.ini > file and put an irrational value (18000 seconds!!!). Still, it seems > that the engine would refuse to execute my query. > > My questions are: > 1. Is the value "0" mentioned as execution time a special value or is > it just a bug? Is it logical to assume that the virtuoso estimates > that the query would require infinite time to execute? > 2. Are there any other configurations that I could do in order to > improve situation? > 3. Is there anything that I should keep in mind when I use the > "OPTIONAL" sparql query pattern? I mean, is there a documented (even > informally) way of improving the performance of queries using OPTIONAL > clauses? > > Kind regards, > Pantelis Natsiavas
I suggest you share your [SPARQL] section settings from your Virtuoso INI. [1] http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtEC2AMIDBpediaInstall -- this doc has a section on settings for DBpedia. -- Regards, Kingsley Idehen Founder & CEO OpenLink Software Company Web: http://www.openlinksw.com Personal Weblog 1: http://kidehen.blogspot.com Personal Weblog 2: http://www.openlinksw.com/blog/~kidehen Twitter Profile: https://twitter.com/kidehen Google+ Profile: https://plus.google.com/+KingsleyIdehen/about LinkedIn Profile: http://www.linkedin.com/in/kidehen Personal WebID: http://kingsley.idehen.net/dataspace/person/kidehen#this
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