Hi,
I need to get the URIs of a set of documents from the database with the below
pattern:
<doc>
<parent value="p1">
<child value="q1"/>
<child value="q1"/>
<child value="q1"/>
....
</parent>
<parent value="p2">
<child value="q2"/>
<child value="q2"/>
<child value="q3"/>
<child value="q3"/>
....
</parent>
....
</doc>
The documents will have multiple entries of <child/> with the same value
attribute and may appear consecutively.
For this, the below XQURY is written:
fn:distinct-values(for $x in cts:uri-match("(: directory name :)") (: directory
is used to limit the search :)
for $a in doc($x)//parent (:
get the sequence of all parent elements from the document :)
let $b:=$a/child (: get the
sequence of children from the parent :)
for $y in 1 to count($b) (:
iterate over the length of sequence :)
where (for $z in $y+1 to
count($b) (: iterate from the next index to identify a similar child :)
where
($b[$y]/@value=$b[$z]/@value)
return $x) !=
"" (: if any such sequence is found, it won't be empty :)
return $x) (: return the
document URI :)
However, the above XQUERY results into time limit exceed exception if the
directory size is big (and hence searching such documents in the entire
database is not possible).
Please suggest an alternative way to make the search of such documents faster.
N.B. Indexing is done for @value attribute of parent.
Regards,
Nachiketa
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