Re: [Exist-open] Problem with index

[Pierrick B. <pie...@fr...>]

Kaixo,

Igor Leturia a =E9crit :

 >> This doesn't work : the syntax expected here is not intended to be
 >>  fully XPath-compliant. You need path expressions with named nodes
 >>  (elements or attributes), for example : <create path=3D"//w/@CERT"
 >> type=3D"xs:string"/> <create path=3D"//w/@lemma" type=3D"xs:string"/>=
 Do
 >> not forget to reindex your collection after the changes.
 >
 >
 > OK, so that was the problem. I thought any XPath expression could do.
 >
 >
 > Now to the eXist developers: is there any intention to support any
 > XPath expression in indexes, such as the one I mentioned, in a near
 > future?


Well... I myself would appreciate such a feature but this would have an=20
impact on performance because indexing could only occur when the entire
document tree is loaded wheras eXist currently indexes "off the scratch"=20
(this explains the limitations in the path expressions).

Well, as I've said many times, I would pay the penalty without any=20
problem :-)

 > I think it would be a great feature, as you could almost make any
 > kind of search in the database very fast, just by adding an
 > appropriate index for each kind of query you were going to do.


Don't underestimate eXist's optimizations : how long does your query=20
take now ? Furthermore, It may not be the best solution to have an index=20
(whatever its structure) for each path : factorization will often have=20
better results.

 > It
 > should not be that difficult,


It isn't as trivial as that. Indexing code is (too ?) firmly coupled=20
with storage code. Furthermore, a deferred indexing needs to use an=20
XPath engine which is able to cope with the "raw" documents. Well, we=20
could reuse one here...

 > Thanks for pointing this, but could you please tell me how do I=20
configure the verbosity?


As often, Google is your friend :
http://www.google.fr/search?hs=3DbpD&hl=3Dfr&client=3Dfirefox-a&rls=3Dorg=
.mozilla%3Afr%3Aofficial&q=3Dexist+profiler+verbosity&btnG=3DRechercher&m=
eta=3D

Then :
http://article.gmane.org/gmane.text.xml.exist/8153.

Cheers,

p.b.