Why xmlindex is not used in the slow queries on xml binary table eval?

I run a slow simple query on Oracle 11.2.0.1 database server that does not use a xmlindex. Instead, a full table scan against the table eval binary xml occurs. This is the query:
 select -- /*+ NO_XMLINDEX_REWRITE no_parallel(eval)*/
      defid from eval,
      XMLTable(XMLNAMESPACES(DEFAULT 'http://www.cigna.com/acme/domains/eval/2010/03',
      'http://www.cigna.com/acme/domains/derived/fact/2010/03' AS "ns7"),
      '$doc/eval/derivedFacts/ns7:derivedFact' passing eval.object_value as "doc" columns defid varchar2(100) path 'ns7:defId'
       ) eval_xml
where eval_xml.defid in ('59543','55208');
The predicate is not selective at all - the number of rows returned is the same as the number of rows in table (325 550 in the eval table xml documents). When different values are used, which brings the number of lines down to ~ 33%, the xmlindex still is not used - as is expected in a purely relational XML environment.

My question is why would'nt the xmlindex be used somehow full scan compared to a sweep of full table that cross the xml for each record in paper table eval?
FFS suspicion would apply to a field of type xmlindex index?

Here is the definition of xmlindex:
 CREATE INDEX "EVAL_XMLINDEX_IX" ON "EVAL" (OBJECT_VALUE)
  INDEXTYPE IS "XDB"."XMLINDEX" PARAMETERS
  ('XMLTable eval_idx_tab XMLNamespaces(DEFAULT ''http://www.cigna.com/acme/domains/eval/2010/03'',
  ''http://www.cigna.com/acme/domains/derived/fact/2010/03'' AS "ns7"),''/eval'' 
       COLUMNS defId VARCHAR2(100) path ''/derivedFacts/ns7:derivedFact/ns7:defId''');
Here is the definition of table eval:
 CREATE
  TABLE "N98991"."EVAL" OF XMLTYPE
  (
    CONSTRAINT "EVAL_ID_PK" PRIMARY KEY ("EVAL_ID") USING INDEX PCTFREE 10
    INITRANS 4 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT
    1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1
    FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE
    DEFAULT) TABLESPACE "ACME_DATA" ENABLE
  )
  XMLTYPE STORE AS SECUREFILE BINARY XML
  (
    TABLESPACE "ACME_DATA" ENABLE STORAGE IN ROW CHUNK 8192 CACHE NOCOMPRESS
    KEEP_DUPLICATES STORAGE(INITIAL 106496 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS
    2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT
    CELL_FLASH_CACHE DEFAULT)
  )
  ALLOW NONSCHEMA ALLOW ANYSCHEMA VIRTUAL COLUMNS
  (
    "EVAL_DT" AS (SYS_EXTRACT_UTC(CAST(TO_TIMESTAMP_TZ(SYS_XQ_UPKXML2SQL(
    SYS_XQEXVAL(XMLQUERY(
    'declare default element namespace "http://www.cigna.com/acme/domains/eval/2010/03"; (::)
/eval/@eval_dt'
    PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
    16777216,0),50,1,2),'SYYYY-MM-DD"T"HH24:MI:SS.FFTZH:TZM') AS TIMESTAMP
WITH
  TIME ZONE))),
    "EVAL_CAT" AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
    'declare default element namespace "http://www.cigna.com/acme/domains/eval/2010/03";/eval/@category'
    PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
    16777216,0),50,1,2) AS VARCHAR2(50))),
    "ACME_MBR_ID" AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
    'declare default element namespace "http://www.cigna.com/acme/domains/eval/2010/03";/eval/@acmeMemberId'
    PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
    16777216,0),50,1,2) AS VARCHAR2(50))),
    "EVAL_ID" AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
    'declare default element namespace "http://www.cigna.com/acme/domains/eval/2010/03";/eval/@evalId'
    PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
    16777216,0),50,1,2) AS VARCHAR2(50)))
  )
  PCTFREE 0 PCTUSED 80 INITRANS 4 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE
  (
    INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0
    FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT
    CELL_FLASH_CACHE DEFAULT
  )
  TABLESPACE "ACME_DATA" ;
Purified sample extract of XML:
<?xml version = '1.0' encoding = 'UTF-8' standalone = 'yes'?><eval createdById="xxxx" hhhhMemberId="37e6f05a-88dc-41e9-a8df-2a2ac6d822c9" category="eeeeeeee" eval_dt="2012-02-11T23:47:02.645Z" evalId="12e007f5-b7c3-4da2-b8b8-4bf066675d1a" xmlns="http://www.xxxxx.com/vvvv/domains/eval/2010/03" xmlns:ns2="http://www.cigna.com/nnnn/domains/derived/fact/2010/03" xmlns:ns3="http://www.xxxxx.com/vvvv/domains/common/2010/03">
   <derivedFacts>
      <ns2:derivedFact>
         <ns2:defId>12345</ns2:defId>
         <ns2:defUrn>urn:mmmmrunner:Medical:Definition:DerivedFact:52657:1</ns2:defUrn>
         <ns2:factSource>tttt Member</ns2:factSource>
         <ns2:origInferred_dt>2012-02-11T23:47:02.645Z</ns2:origInferred_dt>
         <ns2:factValue>
            <ns2:type>boolean</ns2:type>
            <ns2:value>true</ns2:value>
         </ns2:factValue>
      </ns2:derivedFact>
      <ns2:derivedFact>
         <ns2:defId>52600</ns2:defId>
         <ns2:defUrn>urn:ddddrunner:Medical:Definition:DerivedFact:52600:2</ns2:defUrn>
         <ns2:factSource>cccc Member</ns2:factSource>
         <ns2:origInferred_dt>2012-02-11T23:47:02.645Z</ns2:origInferred_dt>
         <ns2:factValue>
            <ns2:type>string</ns2:type>
            <ns2:value>null</ns2:value>
         </ns2:factValue>
      </ns2:derivedFact>
      <ns2:derivedFact>
         <ns2:defId>59543</ns2:defId>
         <ns2:defUrn>urn:ddddunner:Medical:Definition:DerivedFact:52599:1</ns2:defUrn>
         <ns2:factSource>dddd Member</ns2:factSource>
         <ns2:origInferred_dt>2012-02-11T23:47:02.645Z</ns2:origInferred_dt>
         <ns2:factValue>
            <ns2:type>string</ns2:type>
            <ns2:value>INT</ns2:value>
         </ns2:factValue>
      </ns2:derivedFact>
                ...
            With the repeating <ns2:derivedFact> element continuing under the <derivedFacts>
Oracle XML DB 11g Release 2 Developer's Guide is not much help...

Any help is appreciated.

Kind regards
Rick Blanchard

XMLIndex definition is not correct, for the following reasons:

In the COLUMNS clause, the path expression is compared to the context from the main event of XQuery item (HERE "/ eval").
If you use an initial slash as you did, this indicates that the context item is an element of "derivedFacts" (which is not correct since it is an "eval" element).
Therefore, the path points to no existing node:

derivedFact XMLTYPE path ''/derivedFacts/ns7:derivedFact'' virtual

There is a mismatch between the statements of prefix ns7, probably a typing mistake?

''http://www.cigna.com/acme/domains/derived/fact/2010/03'' AS "ns7"
...
''http://www.cigna.com/acme/domains/derived/FACT/2010/03'' AS "ns7"

What "eval_xml" is referring to here?

passing eval_xml.derivedFact

The path to "defId" don't go too:

defId VARCHAR2(100) path ''/derivedFacts/ns7:derivedFact/ns7:defId''

Try this one, it should help you to:

CREATE INDEX "EVAL_XMLINDEX_IX" ON "EVAL" (OBJECT_VALUE)
INDEXTYPE IS "XDB"."XMLINDEX" PARAMETERS (
'XMLTable eval_idx_tab_I
  XMLNamespaces(''http://www.cigna.com/acme/domains/derived/fact/2010/03'' AS "ns7",
                DEFAULT ''http://www.cigna.com/acme/domains/eval/2010/03''),
  ''/eval''
  COLUMNS
   eval_catt   VARCHAR2(50) path ''@category'',
   derivedFact XMLTYPE      path ''derivedFacts/ns7:derivedFact'' virtual
 XMLTable eval_idx_tab_II
  XMLNamespaces(''http://www.cigna.com/acme/domains/derived/fact/2010/03'' AS "ns7",
                DEFAULT ''http://www.cigna.com/acme/domains/eval/2010/03''),
  ''/ns7:derivedFact'' passing derivedFact
  COLUMNS
   defId VARCHAR2(100) path ''ns7:defId'''
);

Tags: Database

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