What's meant by a "rooted XPath expression"? Simply
absolute/non-relative, or something else/more?
Eric
James Clippinger wrote:
Steve, your query is doing some heavyweight filtering for the XPath
because it is doing two steps:
1) Execute the cts:search(): generate a list of all documents matching
the query in relevance order.
2) Execute the XPath: reorder the documents into document order and find
only those with /doc/classifications/classification elements, returning
those classification elements.
Since you are using XPath and thus returning results in document order,
you probably want to use cts:contains() in an XPath predicate rather
than cts:search(). cts:contains() in a rooted XPath expression will use
the search indexes when appropriate, so it's as fast as the equivalent
cts:search() expression. Try this:
let $search := cts:element-attribute-word-query(fn:QName("", "keyword"),
fn:QName("", "value"), "something")
return fn:collection()/doc[cts:contains(.,
$search)/classifications/classification
James
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Steve
Sent: Wednesday, November 12, 2008 8:54 AM
To: [email protected]
Subject: [MarkLogic Dev General] Improving XPath Performance
on SearchResults
I've written a query which I use to search my data set and I
am able to get the results back very quickly. However the
results that I get back show the complete document that the
search matched, where as I want a particular node returned.
At the moment I'm doing this:
let $search := cts:element-attribute-word-query(fn:QName("",
"keyword"), fn:QName("", "value"), "something") let $results
:= cts:search(fn:collection(),
$search)/doc/classifications/classification
return $results
I've tried profiling this query and I've found that there is
a big lag filtering the $results of the search using XPath.
Is there any way, either through using a different query or
search notation, or by indexes etc that I can speed this up.
Thanks in advance...
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