XMLquery - contours do not used throughout the code, but only in the xml request selected

Hello

We use-> database Oracle 11 g Enterprise Edition Release 11.2.0.2.0 - 64 bit
We have a part of our system of s/w works as:
Drop table xml_tbl

create table xml_tbl (
xml_msg_id integer,
xml_msg_text xmltype
);

insert into xml_tbl values(1, '<main xmlns:ns1="Abc:SET"><ns1:id>1</ns1:id></main>');
insert into xml_tbl values(1, '<main xmlns:ns1="Abc:SET"><ns1:id>1</ns1:id></main>');
insert into xml_tbl values(1, '<main xmlns:ns1="Abc:SET"><ns1:id>2</ns1:id></main>');
commit;

--Code

DECLARE
   v_output   CLOB;

   FUNCTION fn_xmlquery (p_date IN DATE)
      RETURN XMLTYPE
   AS
      v_xmlout   XMLTYPE;
      v_query    CLOB
         := TO_CLOB (
               'declare namespace ns1 = "Abc:SET"; fn:count($File_Data/main/ns1:id)');
   BEGIN
      SELECT XMLQUERY (v_query
                       PASSING t_tbl.xml AS "File_Data" RETURNING CONTENT)
        INTO v_xmlout
        FROM (SELECT XMLAGG (xml_msg_text) AS xml
                FROM xml_tbl t
               WHERE XMLEXISTS (
                        'declare namespace ns1 = "Abc:SET";  /main/ns1:id = ("1") '
                        PASSING xml_msg_text)) t_tbl;

      RETURN (v_xmlout);
   END fn_xmlquery;
BEGIN
   v_output :=
      XMLType.getClobVal (fn_xmlquery (TO_DATE ('20121231', 'YYYYMMDD')));
   DBMS_OUTPUT.put_line (v_output);
END;

--Now if I try the outline on xml_tbl query as:

drop outline o_name;

CREATE OUTLINE o_name ON
SELECT XMLAGG (xml_msg_text) AS xml
                FROM xml_tbl t
               WHERE XMLEXISTS (
                        'declare namespace ns1 = "Abc:SET";  /main/ns1:id = ("1") '
                        PASSING xml_msg_text);


select * from dba_outlines;
If we execute just this request again, contour O_Name is used as can be seen in:
Select * from dba_outlines;
It is used in the two schemas in DB, as we wish.

But if we execute all the code above, it takes, to make all the xquery deals.
O_Name OUTLINE is not used. Not even in the same pattern.
You can try the above, in your machine to replicate.

Please suggest how to do the work described in this case. As things do not work in our system at all because the query plan wrong by the above query on which we create the contour.
Thank you...

Published by: user8941550 on January 9, 2013 23:16

Maybe the XQuery Modules will build in a future version of the database.

So please can you suggest a better way we can use so that we can avoid the dynamic xquery thing.

Make the dynamic SQL set instead, not only the request XQuery and run it via EXECUTE IMMEDIATE or DBMS_SQL.
This way, the CBO know XQ expression to analyze the time and be able to optimize it.

I'm not a big fan of this approach, but the lack of something better.

Tags: Database

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