On 22/12/13 06:34, Chaudhuri, Rajiv wrote:
Hi
Is there any command to index the fuseki tdb data?
If you look in the TDB directory, you will see files like SPO.idn and
SPO.dat. That's the SPO clustered index. For triples the indexes are
SPO, POS and OSP. More indexes for quads (named graphs).
TDB has total coverage (every triple order can be answered by an index).
There is no triple table per se - it's all indexes.
Will this indexing (if we have) results in performance improvement while
querying the triple store? Please advice.
Performance questions are hard to deal with without knowing about the
system architecture, the size of the data and the queries being asked.
From your other email, there are glimpses of this not not details. e.g.
If you have an under provisioned database server, and are paging data
across the network (e.g. NFS), then it can be slow especially if the NFS
server itself is shared.
Andy
