What is the desertion of orderly materialized view with MLOG$.

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• What is 'Table of container' in materialized views

  Hello

  What is meant by ' Container Table ' in materialized views?

  "Materialized view" (MV) is, in fact, a table, rather than a view.

  The term MV is used of the 9i database. In the 7 and 8 databases is the term 'snapshot' (to make things more complicated, the MV concept appeared in the 8i database, but in the context of the data warehouse).

  When you create a MV, for example. using the:

  Create materialized view emp_mv

  full refresh on demand

  as select empno, ename from EMP

  /

  you have, in fact, have created two objects in the data dictionary:

  Select object_name, object_type

  from user_objects

  where object_name = 'EMP_MV. '

  order by 1, 2;

  OBJECT_NAME OBJECT_TYPE

  --------------------- -------------------

  MATERIALIZED VIEW EMP_MV

  EMP_MV TABLE

  You can remove MV and a table of container:

  drop materialized view emp_mv;

  or you can delete only MV, preserving a table containing:

  Let fall the materialized view emp_mv maintain the table;

  Kind regards

  Zlatko

• View materialized, ORA-12008: error in the path of refresh materialized view

  I want to refresh a materialized view, but I get an error ORA-12008.
  Does anyone have an idea? I can't find any errors in my update statement.
  

  CREATE MATERIALIZED VIEW scott.dummy_mv
    TABLESPACE test
    BUILD IMMEDIATE
    USING INDEX TABLESPACE idx_test
    REFRESH 
       START WITH sysdate 
       NEXT ROUND(SYSDATE)+5/24          
       WITH PRIMARY KEY
    ENABLE QUERY REWRITE
    AS
    SELECT KM.ID ID
            ,KM.USERNAME USERNAME
         ,KM.ABTID ABTID     
    FROM my_table KM
  /
  
  scott@orcl>desc dummy_mv
   Name                                      Null?    Typ
   ----------------------------------------- -------- ----------------------------
   ID                                        NOT NULL NUMBER(4)
   USERNAME                                  NOT NULL VARCHAR2(30)
   ABTID                                     NOT NULL NUMBER(4)
  
  scott@orcl>
  
  
  BEGIN 
    SYS.DBMS_JOB.REMOVE(6579);
  COMMIT;
  END;
  /
  
  DECLARE
    X NUMBER;
  BEGIN
    SYS.DBMS_JOB.SUBMIT
    ( job       => X 
     ,what      => 'dbms_refresh.refresh(''"scott"."dummy_mv"'');'
     ,next_date => to_date('07.01.2009 05:00:00','dd/mm/yyyy hh24:mi:ss')
     ,interval  => 'ROUND(SYSDATE)+5/24              '
     ,no_parse  => FALSE
    );
    SYS.DBMS_OUTPUT.PUT_LINE('Job Number is: ' || to_char(x));
  COMMIT;
  END;
  /
  
  scott@orcl>exec dbms_refresh.refresh('dummy_mv');
  BEGIN dbms_refresh.refresh('dummy_mv'); END;
  
  *
  FEHLER in Zeile 1:
  ORA-12008: error in materialized view refresh path
  ORA-00947: not enough values
  ORA-06512: in "SYS.DBMS_SNAPSHOT", Zeile 820
  ORA-06512: in "SYS.DBMS_SNAPSHOT", Zeile 877
  ORA-06512: in "SYS.DBMS_IREFRESH", Zeile 683
  ORA-06512: in "SYS.DBMS_REFRESH", Zeile 195
  ORA-06512: in Zeile 1
  
  scott@orcl>

  dealer says:
  I get the same error:

  scott@orcl>exec dbms_mview.refresh('dummy_mv','c');
  BEGIN dbms_mview.refresh('dummy_mv','c'); END;
  
  *
  FEHLER in Zeile 1:
  ORA-12008: error in materialized view refresh path
  ORA-00947: not enough values
  ORA-06512: in "SYS.DBMS_SNAPSHOT", Zeile 820
  ORA-06512: in "SYS.DBMS_SNAPSHOT", Zeile 877
  ORA-06512: in "SYS.DBMS_SNAPSHOT", Zeile 858
  ORA-06512: in Zeile 1
  

  I would first check "request" from the view of the DBA_SNAPSHOTS/DBA_MVIEWS dictionary information, if it reveals something obvious.

  But it looks more like an internal error when processing the update. You can get more information on the follow-up to the session error. "Alter session set sql_trace = true;" before running the update should be sufficient. Then unplug and check the trace file generated error using "tkprof" and check the output or by searching manually "err =" in the trace file.

  What 4 numbers of Oracle version do you use?

  Kind regards
  Randolf

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• What is the need for accessors from view at the level of the entities, as well as the view object level?

  Hi all

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  Hello
  
  Oracle data warehouse Guide says that "the optimizer generates a subquery for a dimension table" when you apply a transform star. Star processing restrictions refer always to "dimension tables. I am referring to an Oracle 11 g server.
  
  My question is: If star can also manipulate materialized views instead of tables in database size? In my scenario, I intend to use views materialized, derived from dimension tables to build a simple star around a fact table schema. SQL queries directly consult the materialized views (contain the names of materialized views in the FROM clause) - no rewriting query or dimensional rollup is intended.
  
  Thanks for your advice.
  
  Concerning
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  >
  If star can also manipulate materialized views instead of tables in database size?
  >
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  Your VM is your dimension tables.

• Refresh/update of the data in a materialized view

  Hello
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  THX

  MVs have properties for update - you a discount based on schedules or when dependent data are committed or manually.

  See you soon
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• need help on the name of the column in double materialized view ORA-00957

  I have a query, long enough and several (8ways) joins.
  
  When I run it as a SQL query, it is fine.
  
  When I add create materialized, view myViewName it errors with
  ORA-00957: duplicate column name.
  
  How is there is no problem when executing the SQL statement, and how to fix this?
  
  Thank you.

  Hello

  Columns in a query do not need a unique name:

  SELECT     dummy
  ,     dummy
  FROM     dual;
  
  D D
  - -
  X X
  

  At least not in SQL * Plus; other front ends might oppose it.
  In previous versions of Oracle, subqueries (such as online views) does not need to have unique names, but you've got an error if you tried to reference a non-unique column (and it is unnecessary to have the column if never reference you).

  Columns in a table or a view need unique names:

  CREATE OR REPLACE VIEW view_x
  AS
  SELECT     dummy
  ,     dummy
  FROM     dual;
  
  ,     dummy
        *
  ERROR at line 4:
  ORA-00957: duplicate column name
  

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  Hello
  
  I use Oracle 10.2.0.
  I created a materialized with option as a Force refresh view. I want to make changes to the underlying query of the materialized view that joins a few other tables. Please advice if I can change the query of the mview.
  
  Kind regards
  Naveen.

  Naveen Kumar C wrote:
  I want to know if there is a way to change the query without dropping the existing and recreate it.

  No, it isn't.

• How to understand where are the data in a materialized view, coming from

  HI: when I run select NAME, OWNER of dba_mview_refresh_times, I see a number of materialized views. How can I find more information on this view it's source data and fields. The source in a different database table has changed. But the view on my database where the materialized view has not changed. I want to confirm origin of data in this view
  
  TIA
  Ravi

  Take a look at the column of the QUERY to the DBA_MVIEWS view.

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