Virtual Index

Hi,
Can someone give me an explanation for Virtual Indexes? Can I find the info in Oracle documentation? It'll be really grateful if i can get the path/link refers this information. Also what's the difference between Virutal index and invisible indexes?
Thanks in Advance,
Titus Thomas

A virtual index is an index that doesn't really exist (i.e. it occupies 0 space) that can be used to determine whether actually creating an index would cause the optimizer to change a query plan. Tim Hall has an article on [virtual indexes|http://www.oracle-base.com/articles/misc/VirtualIndexes.php] that provides a quick introduction.
Justin

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        SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                             
    /action/@status_dt'
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        16777216,0),50,1,2),'SYYYY-MM-DD"T"HH24:MI:SS.FFTZH:TZM') AS TIMESTAMP
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        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                             
    /action/srvContextPointer/outreachActionDefInfo/@actionDefId'
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
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        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                             
    /action/correlationId'
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        16777216,0),50,1,2) AS VARCHAR2(50))),
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        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                                 
    /action/statusReason'
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    /action/actionAppointment/appointment_dt'
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        *"UPDT_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/actions/2010/03"; (::)                                                             
    /action/@update_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
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        *"CRET_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/actions/2010/03"; (::)                                                             
    /action/@create_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
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        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                   
    /action/srvContextPointer/outreachActionDefInfo/@sequence'
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2)) AS NUMBER(10))),
        *"SERVICE_DEF_URN"* AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03";                                                         
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        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(100))),
        *"ASSIGN_TEAM_CD"* AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                 
    /action/assignment/@teamCategoryCode'
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(50))),
        *"ASSIGN_STAFF_ID"* AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                 
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        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(50))),
        *"ACTION_TYPE"* AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03"; (::)                                                     
    declare namespace xsi="http://www.w3.org/2001/XMLSchema-instance"; (::)                                                     
    local-name-from-QName(QName("http://www.cigna.com/acme/domains/actions/2010/03",/action/@xsi:type))                                                                 
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(50))),
        *"ACTN_ID"* AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03";/action/@id'
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(50))),
        *"STATUS"*AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03";/action/@status'
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(20))),
        *"ACME_MBR_ID"* AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY(
        'declare default element namespace "http://www.cigna.com/acme/domains/actions/2010/03";/action/acmeMemberId'
        PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0,
        16777216,0),50,1,2) AS VARCHAR2(50)))
      PCTFREE 10 PCTUSED 40 INITRANS 1 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" ;
    CREATE UNIQUE INDEX *"CROUTREACH"."SYS_C0014547"* ON "CROUTREACH"."ACTION"
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      PCTFREE 10 INITRANS 2 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" ;
    CREATE UNIQUE INDEX *"CROUTREACH"."SYS_IL0000082156C00003$$"* ON "CROUTREACH".
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        PCTFREE 10 INITRANS 2 MAXTRANS 255 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" PARALLEL (DEGREE 0 INSTANCES 0) ;
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      INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0
      FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT
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          INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE
          0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT
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          "CRET_DT"
        PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE
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        INDEX *"CROUTREACH"."ACTION_ACT_DEF_ID_STATUS_IDX"* ON "CROUTREACH"."ACTION"
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          INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE
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        TABLESPACE "ACME_DATA" ;Any suggestions much appreciated.
    Regards,
    Richard Blanchard

    odie 63
    update /*+ NO_XML_DML_REWRITE */croutreach.action set object_value = :1 where actn_id = :2 .
    This update pattern is used in the production environment and is slowing the environment down as more xml content is increased. In a new release build, this update pattern against the action table described earlier, is particularly problematic.
    Have some more information on the /*+ NO_XML_DML_REWRITE */ hint. It turns out, last year, updates statements would intermittently fail to correctly update silently failing. An Oracle Service Request was created. Over the span of about 5 mnths, Oracle determined a very low level Oracle kernel bug was the culprit. Oracle As a result of this SR, Oracle SUpport created BUG 11939507 <ORA-08102: index key not found during update on xmltable with a virtual column>. This bug is viewable on metalink. Oracle claims this bug has only been oberved on In the interim to 11.2.0.3, Oracle Support mentioned to use /*+ NO_XML_DML_REWRITE */; thus disabling piecewise update.
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    Bug 11939507: ORA-08102: INDEX KEY NOT FOUND DURING UPDATE ON XMLTABLE WITH VIRTUAL COLUMN  
    Bug Attributes
    Type B - Defect Fixed in Product Version 12.1
    Severity 2 - Severe Loss of Service Product Version 11.2.0.1
    Status 80 - Development to Q/A Platform 23 - Oracle Solaris on SPARC (64-bit)
    Created 30-Mar-2011 Platform Version 10
    Updated 13-Feb-2012 Base Bug -
    Database Version 11.2.0.1  
    Affects Platforms Generic  
    Product Source Oracle  
    Hdr: 11939507 11.2.0.1 XDB 11.2.0.1 BINARY PRODID-5 PORTID-23
    Abstract: ORA-8102: INDEX KEY NOT FOUND DURING UPDATE ON XMLTABLE WITH VIRTUAL COLUMN*** 03/30/11 12:22 pm ***
    BUG TYPE CHOSEN  =============== code   
    Component: XML Database  ======================= 
    DETAILED PROBLEM DESCRIPTION  ============================ 
    The issue happens intermittently when running a batch program with 50  concurrent sessions that involves high concurrent updates.
    DIAGNOSTIC ANALYSIS  ===================  reproducible testcase on customer dummy data reproduced by Thomas. 
    WORKAROUND?  ===========  No   
    TECHNICAL IMPACT  ================  Customer is experiencing this error which is critical to the application  because it causes a home health care provider to possibly lose a couple  hours worth of work and have to start from scratch. The condition has only  accessed concurrently from about 40 threads  
    RELATED ISSUES (bugs, forums, RFAs)  ===================================  Bug 8514561 - ORA-8102 WHEN UPDATING TABLE
    HOW OFTEN DOES THE ISSUE REPRODUCE AT CUSTOMER SITE?  ====================================================  Intermittent  
    DOES THE ISSUE REPRODUCE INTERNALLY?  ====================================  Intermittent
    IS A TESTCASE AVAILABLE?  ========================  Yes  The good news is, this bug is corrupting a virtual index column.
    I'll try test cases using the update pattern; 'update /*+ NO_XML_DML_REWRITE */croutreach.action set object_value = :1 where actn_id = :2 ' - substituting actual values for the bind variables and removing interfering virtual columns. Wil lcompare with and w/o the hint.
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    <?xml version = '1.0' encoding = 'UTF-8' standalone = 'yes'?><action xsi:type="AssessmentActionType" status_dt="2012-01-18T19:38:21.077Z" status="not applicable" create_dt="2012-01-17T23:10:16.173Z" id="dfdfdfdfdfddfdfdfdfdfdf" xmlns:ns5="http://www.xxxxx.ddd/exception/definition/schema/2010/01" xmlns="http://www.xxxxxx.ddd/mmm/domains/actions/2010/03" xmlns:ns6="http://www.xxxxx.ddd/mmm/domains/utility/outcome/2010/03" xmlns:ns7="http://www.xxxxxx.ddd/mmm/domains/common/2010/03" xmlns:ns2="http://www.xxxxx.ddd/mmm/messages/actions/2010/03" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns3="http://www.xxxxx.ddd/mmm/domains/workforce/2010/03" xmlns:ns4="http://www.xxxxxx.ddd/mmm/domains/entitlement/2011/11">
       <acmeMemberId>abcdefghijklmnop</acmeMemberId>
       <advocacyPlanId>qrstuvwxyz</advocacyPlanId>
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          <serviceDefUrn>urn:coderunner:Medical:Definition:ServiceService:11111:7</serviceDefUrn>
          <outreachActionDefInfo sequence="1" actionDefUrn="urn:xxxxxxxxxx:Medical:Definition:Action:50813:2" actionDefId="xxxxxx">
             <srvContextPath>Access Profile~Why did you access the profile?~Reason for access?</srvContextPath>
          </outreachActionDefInfo>
       </srvContextPointer>
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    SET A.object_value = updatexml(A.object_value,'/action/@status','triggered','xmlns="http://www.xxxx.vvv/yyy/domains/actions/2010/03"')
    where a.actn_id='888a80be-d69f-464d-b3f7-85b6209f918e';
    This statment updates fine with and w/o the hint. This hint takes away the piecewise update of the xml document and relies upon the a.actn_id virtual column.
    Then removed the reliance on the virtual column using the xmlexists fn.
    First did an alter index 'actn_id_pk invisible' to take the virtual column out of consideration by the optimizer.
    UPDATE /*+ NO_XML_DML_REWRITE */ action A
    SET A.object_value = updatexml(A.object_value,'/action/@status','triggered','xmlns="http://www.xxxx.vvv/yyy/domains/actions/2010/03"')
    where xmlexists('$p/action[@id="'888a80be-d69f-464d-b3f7-85b6209f918e'"]' PASSING object_value as "p");
    This update runs but doesn't update any columns - with or without the hint.
    Also created a basic unstructured xmlindex to remove the full table scan - which worked fine execution plan-wise.
    create index action_xmlindex_ix on action (object_value) indextype is xdb.xmlindex;Per the SR on this, the /*+ NO_XML_DML_REWRITE */ disables piecewise update and is a workaround for the bug surrounding virtual column index usage when having many concurrent sessions and updates against a table with millions of xml documents. Getting rid of the virtual column in the predicate removes the need for the workaround hint.
    My problem is This update runs but doesn't update any columns. Maybe am missing something or doing a syntax/semantic error ?
    Any assistance much appreciated...
    Regards,
    Rick Blanchard
    Edited by: RickBlanchardSRSCigna on Apr 25, 2012 12:52 PM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

  • Help on integrating 3rd party search engine

    Hi
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    #1.5#C000A76908A80011000000055563AAFF0003F0CDE63EA4D8#1109192051958#com.sapportals.wcm.control.util.search.SearchSessionBuilder#irj#com.sapportals.wcm.control.util.search.SearchSessionBuilder#System#0#####Client_Thread_86##0#0#Error##Plain###Error during search occurred - com.sapportals.wcm.WcmException - com.sapportals.wcm.WcmException
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