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From joe verderber <jjverder...@gmail.com>
Subject Re: XPath path constraint
Date Wed, 30 Jan 2013 01:18:33 GMT

Have you considered using a JCR-SQl2 query? It may give better performance.


On Tue, Jan 29, 2013 at 8:14 AM, <mslama@email.cz> wrote:

> Hi,
> I want to ask if there is any plan to optimize or fix performance of XPath
> query with path constraint. I asked about my problem a while
> ago. It was as follows:
> If I have node structure /a/b and want to find out all nodes b with
> property
> p which has value 'v1' I can use
> either XPath expression with path constraint
> //a/b[@p='v1']
> but this is quite slow (both query and then iteration over result set).
> So we use query without path constraint:
> //*[@p='v1']
> It is considerably faster (more than 10times) but it is error prone. Even
> if
> we try to keep property names globally unique
> we still use some subtree to store 'invalid' nodes which will need some
> manual intervention but we do not want those nodes
> to be returned. So we either have to filter result (using path prefix) or
> go
> back to path constraint in query but then we are back to
> very poor query performance.
> So my question is: Is there any plan to handle bad query performance when
> path constraint is used in XPath query?
> Thanks
> Marek


--Joe Verderber

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