Query Performance Has Changed

Support
1

I have a query, which I will detail below, which worked on the 6.X series of Stardog and had OK performance. Now, with 7.0.1 (I tried to download the 7.0.2 to see if there is a difference but the wget as listed on the webisite downloaded 7.0.1), the query does not finish within the 5m timeout (but does if I bump the query timeout to 10m) and the query plan seems out of proportion for what the query seems to be. The main configuration options that I use are sameAs=FULL.

prefix rel: <http://purl.org/vocab/relationship/>
prefix foaf:  <http://xmlns.com/foaf/0.1/>

select ?a
from <tag:stardog:api:context:all>
where {
    ?a rel:descendantOf <http://example.com/LL/lagin.trig#ConaillCernaig>
}

The query plan is 30785 lines long so I will not include it here but I can provide it on request.

Thank you for your time and consideration.

2

Hi Chris,

If you share the dataset, we will try to reproduce. Otherwise plans for 6.* and 7.0.1 could help too.

Best,
Pavel

3

Hi Pavel,

I would be happy to send you the dataset. Would you like me to attach it to this issue or email it to you? Sadly, I do not have 6.* on my machine anymore.

All the best,
Chris

4

You can send it directly to me (pavel at stardog) or upload to some file sharing service.

Thanks,
Pavek

5

Chris,

In fact, the plans are similarly large with both 6 and 7. Stardog 6 is indeed faster executing it. We'll look into it. The internal issue number is #7937, in case i forget to provide an update (you can look it up in the release notes).

Best,
Pavel

1 Like
6

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