Hard to say without seeing a complete example query The ARQ query engine which TDB uses streams results wherever possible so if there is only one results in principal adding LIMIT 1 won't change much.
That being said there are certain query optimisations that require a LIMIT to be present so depending on the query adding the LIMIT 1 may result in a different query plan which may be marginally more efficient. Rob On 11/12/2013 17:51, "Charles Li" <[email protected]> wrote: >Hi, everyone! > >I have a sparql query running by Jena code (2.10.1) against a TDB store. >If >I know for sure the query will always return one record, will the use of >"limit 1" in the query string improve performance statistically? > >Thanks!
