Hi Medha,
The "PARTITION (S int (0hexffff00))" statement is used for scale out cluster
only for the partitioning of the data across nodes and thus has no effect on
single server or open source builds.
The index is created as a distinct projection of S & P compressed column wise,
further details on the Virtuoso column store implementation which discusses the
architecture in detail can be found at:
http://sites.computer.org/debull/A12mar/vicol.pdf - Virtuoso, a Hybrid
RDBMS/Graph Column Store
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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On 19 Sep 2014, at 09:25, Medha Atre <medha.a...@gmail.com> wrote:
> Hi,
>
> I was following the RDF performance tuning tutorial on
> http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtRDFPerformanceTuning
>
> For an index created as --
>
> "CREATE DISTINCT NO PRIMARY KEY REF COLUMN INDEX RDF_QUAD_SP
> ON DB.DBA.RDF_QUAD (S, P)
> PARTITION (S int (0hexffff00));"
>
> What exactly does "PARTITION (S int (0hexffff00))" do? Also is the
> RDF_QUAD_SP index created as a B+ tree or some other data structure?
>
> Could someone please explain?
> I checked the "create index" explanation page in Virtuoso docs, but it
> didn't clarify it to me exactly.
>
> Appreciate some help.
>
> Thanks.
> Medha
>
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