Dear Mr. Williams,
Thank you very much for the information.
Thanks & Regards,
Jyoti
On Sun, Sep 20, 2015 at 6:34 AM, Hugh Williams <hwilli...@openlinksw.com>
wrote:
> Hi Jyoti,
>
> Virtuoso does not cache query result sets per say, but rather the
> databases working set for a given query work load gets loaded into memory
> (cache) on demand such that subsequent queries touching the same database
> working set would not have to be read from disk. Thus the first time a
> query is run the data is read from disk (“cold”) and may take sometime but
> subsequent runs where data is read from memory (“warm”) and will be
> significantly faster. See the Virtuoso RDF Performance Tuning Guide [1] for
> details on the INI file for tuning memory buffers available for caching the
> database working set and [2] for general performance tuning of the Virtuoso
> database. The key to performance being to have enough memory buffers to
> keep the database working set of the required query work load in memory at
> all time such that not disk access is required once the database is “warm”
> ie the working set cached is cached in memory.
>
> [1]
> http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFPerformanceTuning
> [2] http://docs.openlinksw.com/virtuoso/databaseadmsrv.html#ptune
>
> Best Regards
> Hugh Williams
> Professional Services
> OpenLink Software, Inc. // http://www.openlinksw.com/
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>
> On 17 Sep 2015, at 16:12, Jyoti Leeka <jyo...@iiitd.ac.in> wrote:
>
> Dear All,
>
> I have the following question regarding Virtuoso 7.2. I'll be grateful if
> you could help me with this a bit. Does Virtuoso 7.2 cache the query
> results precisely and serves them back or does it cache the relevant
> portions of the database and then recomputes the results? Also can we
> adjust the amount of memory used by Virtuoso for caching. If yes, then how?
>
>
> Thanks & Regards,
> Jyoti
> Leeka
> PhD Student
> IIIT-Delhi
> India
>
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>
--
Thanks & Regards,
Jyoti
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