XMLAGG structure, performance need help for odd nesting in the schema

Hello

I have to produce XML to look like:
<?xml version='1.0'?>
  <enterprise>
    <membership>
      <sourcedid>
        <id>PHYS_101_001_FA2007</id>
      </sourcedid>
    <!-- NOTE: absence of "members" level tag for XMLAGG! -->
    <member>
      <sourcedid>
        <id>D2LU0001</id>
      </sourcedid>
      <role roletype="Sample Role">
        <status>1</status>
      </role>
    </member>
    <member>
      <sourcedid>
        <id>D2LU0002</id>
      </sourcedid>
      <role roletype="Sample Role">
        <status>1</status>
      </role>
    </member>
  </membership>
</enterprise>
It would be simple if the scheme allowed for a '< member >' tag under which fit the tags < member >. But it does not this tag, or any other than those listed above.

I have a query that does not produce this output (with the exception of the roletype attribute), but its execution is horrible; It takes about 40 minutes to return data:
SELECT
     XMLROOT(
         XMLELEMENT("enterprise",
           XMLAGG(
             XMLELEMENT("membership",
               XMLFOREST( XMLELEMENT("id",cx.mapped_course_id) as "sourcedid"
                        ),
               (SELECT XMLAGG(
                 XMLELEMENT("member",
                   XMLFOREST(XMLELEMENT("id",spriden_id) AS "sourcedid",
                             XMLELEMENT("status",'1') AS "role"
                             )
                       )
                      )
                  FROM enrollments_fall_sfrstca efs
                     , spriden sp
                     , gzv_tuid t
                 WHERE sp.spriden_change_ind IS NULL
                   AND sp.spriden_pidm       = t.pidm
                   AND t.tuid                = efs.user_name
                   AND efs.mapped_course_id  = cx.mapped_course_id
                   AND efs.term              = cx.semester
              )
                )
               )
              )
            , VERSION '1.0', STANDALONE NO VALUE)
  FROM courses_xt cx
WHERE cx.semester = :term_code
;
Similar queries produce classes and XML users very well without any performance problems, but these are driven out of the view of course or the sight of registrations, but not both.

Is there another way that I can produce the nesting that I need for the scheme the provider?

Source views are basically as follows (showing the relevant columns only):
courses_xt:
MAPPED_COURSE_ID       SEMEST
---------------------- ------
AVFT209-13307-201210   201210
AVFT210-13308-201210   201210
enrollments_fall_sfrstca:
MAPPED_COURSE_ID       USER_NAME
---------------------- ---------
AVFT209-13307-201210    FULLERC8
AVFT209-13307-201210    SHUPEK
AVFT209-13307-201210    NOMAN
AVFT210-13308-201210    SHUPEK
AVFT210-13308-201210    PELLONM
When I make the request without the XML (with subqueries as a column of the outer query), it returns the appropriate fast data (a few minutes).

I tried various permutations of XMLFOREST, XMLELEMENT, XMLAGG but I get a syntax error, or the data is not going (e.g. repeated "< membership >" for each "< member >", or should I create a "< member >" invalid tag filter later).

Please advise!

Thank you
Anita Lees

Hi Anita,.

Have you tried with a GROUP BY and any subquery?

Here is an example of the use of schema SCOTT.
I used the same names to tags and structure so that you can see the analogy:

SELECT XMLElement("enterprise",
         XMLAgg(
           XMLElement("membership",
             XMLElement("sourceid", xmlelement("id", d.deptno))
           , XMLAgg(
               XMLElement("member",
                 XMLElement("sourceid",
                   XMLElement("id", e.empno)
                 )
               , XMLElement("role",
                   XMLAttributes(e.job as "roletype")
                 , XMLElement("status", '1')
                 )
               )
             )
           )
         )
       )
FROM scott.dept d
     LEFT OUTER JOIN scott.emp e ON e.deptno = d.deptno
WHERE d.deptno IN (10,20)
GROUP BY d.deptno
;

What gives:


  
    
      10
    
    
      
        7782
      
      
        1
      
    
    
      
        7934
      
      
        1
      
    
    
      
        7839
      
      
        1
      
    
  
  
    
      20
    
    
      
        7369
      
      
        1
      
    
    
      
        7902
      
      
        1
      
    
    
      
        7566
      
      
        1

Tags: Oracle Development

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