[Exist-open] count on big files. OutOfMemoryError

[<MI...@os...>]

Hi all!

My application stores records in following xml

<root>
      <instance date="" country="AM" ip="127.0.0.1" anket="a1.1" model="model-1">
                <question id="q_1">
                          <value id="a_1"/>
                </question>
                <question id="q_2">NO_VALUE</question>
                <question id="q_3">
                          <value id="a_2"/>
                </question>
                ....
      </instance>
      ......
      <instance>
                .....
      </instance>
</root>

A have about 18 500 <instance> elements
Each <instance> contains from 12-16 <question> elements with from 1-4
<value>. Total size of the file is about 17 MB.

I need to count questions, values by questions that satisfies filter on question values

I use following XQuery
  count(collection('path_to_file')/root/instance/question[@id='question_id']) to count without filter

and
  count(collection('path_to_file')/root/instance[question[@id='q_3']/value/@id='a_1' and ... some other conditions]/question[@id='question_id']) to count with filter

Also I need to count stat. of values by questions (also  with filter).
  
query without filter executes about from 1 to 3 minutes!!!
and query with filter fails with OutOfMemoryError
on my Celeron 1000 Mhz with 256Mb RAM

I use Exist version: 1.0b2 build: 20041107

How to optimize queries or maybe twike eXist to make it possible to
execute counts with filters in my case? Pleese help!

Will current snapshot solve the problem?

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