zeitgeist team mailing list archive

[Markus Korn <thekorn@xxxxxx>]

New version of the test script, run this script in lp:zeitgeist and in
the attached branch, compare the last line of the output, the attached
branch should be about 8-10% faster

** Attachment added: "glob-index-test_v2.py"
   https://bugs.edge.launchpad.net/zeitgeist/+bug/641198/+attachment/1621609/+files/glob-index-test_v2.py

-- 
Prefix search is not using an index
https://bugs.launchpad.net/bugs/641198
You received this bug notification because you are a member of Zeitgeist
Framework Team, which is subscribed to Zeitgeist Framework.

Status in Zeitgeist Framework: In Progress

Bug description:
In the prefix search we are using a 'GLOB' sql-statement, this statement is not using the index and thus slow, some timings from me running the attached script:

* Database with ~50k events
* ~1% of these event have a subject with uri beginning with 'http://aa'

* searching for all uris beginning with 'http://aa' using the 'GLOB' expression (what we have now in lp:zeitgeist) takes ~0.03 sec
* changing this query to some (x >= S AND x < T) statement reduces this time to ~0.002 sec

This is easy to implement (and test) for ascii chars, but as we support unicode esp. testing seems to be a bit tricky