How did you load the TDB store? Is it possible you used tdbloader2 for
the first load and tdbloader for the second?
Brian
On 13/05/14 14:13, Ewa Szwed wrote:
I have the following problem with my Jena TDB instance.
Last year in November I have loaded freebase dump to Jena TDB and I was
able to work with it reasonably good and got quite good performance for
most of my queries.
Recently I have updated my Jena TDB store with a dump from April.
Here are some numbers to show the difference between these 2 instances.
*November 2013*
*April 2014*
Full time of import
262,052 sec /3,03 days
716,121 sec / 8,29 days
Number of triples
1,826,551,456
2,489,221,915
Index size (whole dir)
174 GB
333 GB
My problem is that my new instance in not performing at all.
The queries that previously run for a couple of minutes take a couple of
hours now and it is not acceptable for my business. :(
So I would like to ask if there is a practical index limit size for Jena
TDB. Is there anything I can do to improve the performance of it.
Is this significant drop in performance sth expected or maybe I have sth
fundamentally wrong in my set up - which I would need to track and fix.
Please advise.
Regards,
Ewa Szwed
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