How to create a complex organization Index Materialized View example

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  Also, I want to know why I needed to GRANT ALL HR for the creation of this point of view, materialized.

  You also need a (selection) grant on the MV newspaper created for master during an attempt to build a quickly updatable MV.

  ISSUE: Permissions problem making fast refresh

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• Materialized views Refresh method and refresh option

  Hi Experts,

  According to the docs, If the MV contains the following, MV is considered complex. I wonder is there any view data dictionary that indicates the type of MV? Because is very easy to the candidate a complex type mv. Because many queries contains the properties below.

  http://docs.Oracle.com/CD/B28359_01/server.111/b28326/repmview.htm#i52501

  http://docs.Oracle.com/CD/B28359_01/server.111/b28313/basicmv.htm

  Specifically, a materialized view is considered complex if the materialized view definition query contains:

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  • An INTERSECT , MINUS , or UNION ALL operation
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  • In some cases, joins other than those in a subquery, although it is possible to have joins in the definition to interrogate and still have a simple materialized view
  • In some cases, a UNION operation

  
  

  After that I kept going to read that I learned that when a VM is created, the refresh mode is specified according to the type of the MV. That means, using ON-DEMAND refresh mode is widespread. The documentation mentions that there isa also refresh option. My question is, is it possible to specify

  ON REQUEST and FAST together?

  Also, what are the differences between FULL and FAST. Ends truncate the table and fill it up again?

  ON COMMIT

  Refresh product automatically when a transaction which changed one of the paintings of the materialized view's retail is committed. This can be specified as the materialized view is quickly updatable (in other words, not complex). The ON COMMIT privilege is required to use this mode.

  ON DEMAND

  Refresh occurs when a user manually executes one of the procedures available refresh contained in the DBMS_MVIEW package ( REFRESH , REFRESH_ALL_MVIEWS , REFRESH_DEPENDENT ).

  COMPLETE	Refreshes and recalculating the materialized view query definition.
  FAST	Applies incremental changes to refresh the materialized view using the information recorded in the papers of the materialized view, or an SQL * Loader direct-path access or a partition maintenance operation.

  FORCE

  Applies FAST update if possible; otherwise, it applies COMPLETE Refresh.

  NEVER

  Indicates that the materialized view will not be updated with updating mechanisms.

  Select * from version of v$.

  Oracle Database 11 g Release 11.2.0.4.0 - 64 bit Production

  Thank you

  Çaglar wrote:

  ...

  Also, what are the differences between FULL and FAST. Ends truncate the table and fill it up again?

  ...

  Thank you

  I just want to answer the truncated question. Seems that nobody covered that yet.

  Answer: It depends.

  If you do a full refresh, then the default is to use ATOMIC_REFRESH = TRUE.

  This means that the update is done via an insert, delete , and ... Select.

  You can change it to ATOMIC_REFRESH = FALSE (parameter dbms_mview.refresh).

  This means that is a TRUNCATE and insert a ... Select with APPEND peak (path direct insert).

  Refresh if Atomic = FALSE is considerably faster than the default. Also way less Archives of newspapers are written.

  The downside is however that, during the update the MV is empty, is no longer an atomar operation!

  See also Oracle documentation: http://docs.oracle.com/cd/B28359_01/appdev.111/b28419/d_mview.htm#i997194

• Pivot can be used in fast refresh materialized view?

  Hi, I have a question about materialized view nested mode fast refresh on Oracle 11 g (It support function of pivot, but oracle 10 g doesn't support).
  
  When I created, he throws "ORA-12015: cannot create a view fast refresh materialized by a complex query.
  Then I used dbms_mview.explain_mview to see reason, and it tell me the following
  REFRESH_FAST_AFTER_INSERT ' view inline or subquery in LIST not supported for this type of MV.
  
  Can someone help me, any suggestions will be appreciated
  

  create table empX as select * from scott.emp;
  alter table empX add constraint PK_empX_empno primary key (empno);
  
  --drop  MATERIALIZED VIEW LOG ON empX;
  CREATE MATERIALIZED VIEW LOG ON empX with rowid, sequence(empno);
  
  --drop MATERIALIZED VIEW mv_empX;
  CREATE MATERIALIZED VIEW mv_empX
  REFRESH FAST START WITH SYSDATE
  NEXT  SYSDATE + 1/1440
  AS   
    select * from
    (
     select rowid emp_rowid, deptno, job, sal from empX
    )
    PIVOT( max(sal) for job IN ('ANALYST' job1, 'CLERK' job2, 'MANAGER' job3));
   
  --select * from mv_capabilities_table
  declare
    lv_sqltext varchar2(4000);
  begin
    execute immediate 'truncate table mv_capabilities_table';
    lv_sqltext := 'select * from
    (
     select deptno, job, sal from empX
    )
    PIVOT( max(sal) for job IN (''ANALYST'' job1, ''CLERK'' job2, ''MANAGER'' job3))
    ';  
    dbms_mview.explain_mview(lv_sqltext,'nested=>TRUE');
    commit;
  end;
  /

  Let me help you...
  I have done following and it run/view updated because I just replaced quickly with a complete word, because there are limitations for quickly updatable views:

  SQL> show user;
  USER is "SCOTT"
  SQL> create table empX as select * from scott.emp;
  
  Table created.
  
  SQL> alter table empX add constraint PK_empX_empno primary key (empno);
  
  Table altered.
  
  SQL>
  SQL> --drop  MATERIALIZED VIEW LOG ON empX;
  SQL> CREATE MATERIALIZED VIEW LOG ON empX with rowid, sequence(empno);
  
  Materialized view log created.
  
  SQL>
  SQL> --drop MATERIALIZED VIEW mv_empX;
  SQL> CREATE MATERIALIZED VIEW mv_empX
    2  REFRESH COMPLETE WITH rowid
    3  START WITH sysdate
    4  NEXT  SYSDATE + 1/1440
    5  AS
    6    select * from
    7    (
    8     select rowid emp_rowid, deptno, job, sal from empX
    9    )
   10    PIVOT( max(sal) for job IN ('ANALYST' job1, 'CLERK' job2, 'MANAGER' job3));
  
  Materialized view created.
  
  SQL> select * from mv_empx;
  
  EMP_ROWID              DEPTNO       JOB1       JOB2       JOB3
  ------------------ ---------- ---------- ---------- ----------
  AAAShcAAEAAAATTAAN         10                  1300
  AAAShcAAEAAAATTAAE         30
  AAAShcAAEAAAATTAAJ         30
  AAAShcAAEAAAATTAAC         30
  AAAShcAAEAAAATTAAA         20                   800
  AAAShcAAEAAAATTAAK         20                  1100
  AAAShcAAEAAAATTAAM         20       3000
  AAAShcAAEAAAATTAAD         20                             2975
  AAAShcAAEAAAATTAAB         30
  AAAShcAAEAAAATTAAI         10
  AAAShcAAEAAAATTAAL         30                   950
  
  EMP_ROWID              DEPTNO       JOB1       JOB2       JOB3
  ------------------ ---------- ---------- ---------- ----------
  AAAShcAAEAAAATTAAF         30                             2850
  AAAShcAAEAAAATTAAG         10                             2450
  AAAShcAAEAAAATTAAH         20       3000
  
  14 rows selected.
  
  SQL> begin
    2  dbms_mview.refresh('SCOTT.mv_empx');
    3  end;
    4  /
  
  PL/SQL procedure successfully completed.
  
  SQL> select * from mv_empx;
  
  EMP_ROWID              DEPTNO       JOB1       JOB2       JOB3
  ------------------ ---------- ---------- ---------- ----------
  AAAShcAAEAAAATTAAN         10                  1300
  AAAShcAAEAAAATTAAE         30
  AAAShcAAEAAAATTAAJ         30
  AAAShcAAEAAAATTAAC         30
  AAAShcAAEAAAATTAAA         20                   800
  AAAShcAAEAAAATTAAK         20                  1100
  AAAShcAAEAAAATTAAM         20       3000
  AAAShcAAEAAAATTAAD         20                             2975
  AAAShcAAEAAAATTAAB         30
  AAAShcAAEAAAATTAAI         10
  AAAShcAAEAAAATTAAL         30                   950
  
  EMP_ROWID              DEPTNO       JOB1       JOB2       JOB3
  ------------------ ---------- ---------- ---------- ----------
  AAAShcAAEAAAATTAAF         30                             2850
  AAAShcAAEAAAATTAAG         10                             2450
  AAAShcAAEAAAATTAAH         20       3000
  
  14 rows selected.
  
  SQL>
  

  So, the answer is Yes, we can use Pivot with Materialized view but:
  1 MV must be full refresh.
  2 oracle version should be 11 g; of course the pivot is available in Oracle 11 g.

  If this answers your question, please close the message, otherwise continue.

  These links may also be of interest:
  http://docs.Oracle.com/CD/B28359_01/server.111/b28313/basicmv.htm#i1007028
  http://docs.Oracle.com/CD/B28359_01/server.111/b28313/basicmv.htm#i1007007

  http://rwijk.blogspot.in/2009/06/fast-refreshable-MATERIALIZED-view.html

  And:

  Please see if (Note: 179466.1 - view to fast refresh materialized diagnose ORA-12015 / complex queries) help.

  Concerning
  Girish Sharma

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  Hi all
  
  I created a procedure to refresh materialized views:
  
  create or replace procedure refresh_MV1 is
  Start
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  exception
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  exception
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  Thank you
  Chrystelle

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  Most likely your username has been granted privileges via a role

  grant all on Materialized_view_1 to myRole;
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  grant all on Materialized_view_1 to myUser
  

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