On 26/10/11 08:39, Dave Reynolds wrote:
On Tue, 2011-10-25 at 21:38 +0200, Laurent Pellegrino wrote:
Hi all,
Is it possible to retrieve the last N quadruples which have been
inserted into a Jena TDB datastore when the quadruples which have been
inserted do not contain any information about their publication time
(e.g. a jena built-in function to use in order to order by using the
internal identifiers used by the repository)?
I don't believe there is such an insert timestamp available.
There is no such timestamp.
There was a paper at ISWC2011 that suggested using timestamps on
something (e.g. B+Tree blocks) to guide caching. [1]
But as Greg (The presenter) said, "it cuts through every layer of
abstraction in a system to provide that information." and various
implementers in the audience smirked.
So a system derived from TDB to add it maybe done by someone who s'
interested. Also, for most users, it would be a noticable cost.
Andy
[1]
Enabling fine-grained HTTP caching of SPARQL query results
Gregory Todd Williams and Jesse Weave
http://iswc2011.semanticweb.org/fileadmin/iswc/Papers/Research_Paper/03/70310752.pdf
Dave
