Oracle ADF - request fast refresh for a table in the pop-up.

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  The installation program.
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  Database table:

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   Name                                      Null?    Type
   ----------------------------------------- -------- ----------------------------
   PK_ACTION_ID                              NOT NULL NUMBER(10)
   CATEGORY                                           VARCHAR2(20)
   INT_DESCRIPTION                                    VARCHAR2(4000)
   EXT_DESCRIPTION                                    VARCHAR2(4000)
   ACTION_TITLE                              NOT NULL VARCHAR2(400)
   CALL_DURATION                                      VARCHAR2(6)
   DATE_OPENED                               NOT NULL DATE
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   BILLING_STATUS                                     VARCHAR2(15)
   ACTION_NUMBER                                      NUMBER(3)
   THIRD_PARTY_NAME                                   VARCHAR2(25)
   MAILED_TO                                          VARCHAR2(400)
   FK_CONTACT_ID                                      NUMBER(10)
   FK_EMPLOYEE_ID                            NOT NULL NUMBER(10)
   FK_ISSUE_ID                               NOT NULL NUMBER(10)
   STATUS                                             VARCHAR2(80)
   PRIORITY                                           NUMBER(1)
   EMAILED_CUSTOMER                                   TIMESTAMP(6) WITH LOCAL TIME
                                                       ZONE
  
  
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  build immediate
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  TABLE_NAME                     LAST_ANAL
  ------------------------------ ---------
  ISSUE_OPEN_MV                  15-NOV-10
  
  *note: table was created a couple of days ago *
  
  SQL> exec dbms_mview.explain_mview('TG.ISSUE_OPEN_MV');
  
  CAPABILITY_NAME                P REL_TEXT MSGTXT
  ------------------------------ - -------- ------------------------------------------------------------
  PCT                            N
  REFRESH_COMPLETE               Y
  REFRESH_FAST                   Y
  REWRITE                        Y
  PCT_TABLE                      N ACTION   relation is not a partitioned table
  REFRESH_FAST_AFTER_INSERT      Y
  REFRESH_FAST_AFTER_ANY_DML     Y
  REFRESH_FAST_PCT               N          PCT is not possible on any of the detail tables in the mater
  REWRITE_FULL_TEXT_MATCH        Y
  REWRITE_PARTIAL_TEXT_MATCH     Y
  REWRITE_GENERAL                Y
  REWRITE_PCT                    N          general rewrite is not possible or PCT is not possible on an
  PCT_TABLE_REWRITE              N ACTION   relation is not a partitioned table
  
  13 rows selected.

  Fast refresh works fine. And the newspaper is kept small enough.
  

  SQL> select count(*) from mlog$_action;
  
    COUNT(*)
  ----------
           0

  When I update a row in the base table:

  var in_action_id number;
  
  exec :in_action_id := 398385;
  
  UPDATE action
  SET emailed_customer = SYSTIMESTAMP
  WHERE pk_action_id = :in_action_id
  AND DECODE(emailed_customer, NULL, 0, 1) = 0
  /
  
  commit;

  What follows, I get via tkprof.

  ********************************************************************************
  
  INSERT /*+ IDX(0) */ INTO "TG"."MLOG$_ACTION" (dmltype$$,old_new$$,snaptime$$,
    change_vector$$,sequence$$,m_row$$,"PK_ACTION_ID","DATE_OPENED",
    "FK_ISSUE_ID")
  VALUES
   (:d,:o,to_date('4000-01-01:00:00:00','YYYY-MM-DD:HH24:MI:SS'),:c,
    sys.cdc_rsid_seq$.nextval,:m,:1,:2,:3)
  
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        1      0.00       0.01          0          0          0           0
  Execute      2      0.00       0.03          4          4          4           2
  Fetch        0      0.00       0.00          0          0          0           0
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total        3      0.00       0.04          4          4          4           2
  
  Misses in library cache during parse: 1
  Misses in library cache during execute: 1
  Optimizer mode: CHOOSE
  Parsing user id: SYS   (recursive depth: 1)
  
  Rows     Row Source Operation
  -------  ---------------------------------------------------
        2  SEQUENCE  CDC_RSID_SEQ$ (cr=0 pr=0 pw=0 time=28 us)
  
  
  Elapsed times include waiting on following events:
    Event waited on                             Times   Max. Wait  Total Waited
    ----------------------------------------   Waited  ----------  ------------
    db file sequential read                         4        0.01          0.01
  ********************************************************************************
  
  ********************************************************************************
  
  update "TG"."MLOG$_ACTION" set snaptime$$ = :1
  where
   snaptime$$ > to_date('2100-01-01:00:00:00','YYYY-MM-DD:HH24:MI:SS')
  
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        1      0.00       0.01          0          0          0           0
  Execute      1      0.94       5.36      55996      56012          1           2
  Fetch        0      0.00       0.00          0          0          0           0
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total        2      0.94       5.38      55996      56012          1           2
  
  Misses in library cache during parse: 1
  Misses in library cache during execute: 1
  Optimizer mode: CHOOSE
  Parsing user id: SYS   (recursive depth: 1)
  
  Rows     Row Source Operation
  -------  ---------------------------------------------------
        0  UPDATE  MLOG$_ACTION (cr=56012 pr=55996 pw=0 time=5364554 us)
        2   TABLE ACCESS FULL MLOG$_ACTION (cr=56012 pr=55996 pw=0 time=46756 us)
  
  
  Elapsed times include waiting on following events:
    Event waited on                             Times   Max. Wait  Total Waited
    ----------------------------------------   Waited  ----------  ------------
    db file scattered read                       3529        0.02          4.91
  ********************************************************************************
  
  select dmltype$$, max(snaptime$$)
  from
   "TG"."MLOG$_ACTION"  where snaptime$$ <= :1  group by dmltype$$
  
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        1      0.00       0.00          0          0          0           0
  Execute      1      0.00       0.00          0          0          0           0
  Fetch        2      0.70       0.68      55996      56012          0           1
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total        4      0.70       0.68      55996      56012          0           1
  
  Misses in library cache during parse: 1
  Misses in library cache during execute: 1
  Optimizer mode: CHOOSE
  Parsing user id: SYS   (recursive depth: 1)
  
  Rows     Row Source Operation
  -------  ---------------------------------------------------
        1  SORT GROUP BY (cr=56012 pr=55996 pw=0 time=685671 us)
        2   TABLE ACCESS FULL MLOG$_ACTION (cr=56012 pr=55996 pw=0 time=1851 us)
  
  
  Elapsed times include waiting on following events:
    Event waited on                             Times   Max. Wait  Total Waited
    ----------------------------------------   Waited  ----------  ------------
    db file scattered read                       3529        0.00          0.38
  ********************************************************************************
  
  delete from "TG"."MLOG$_ACTION"
  where
   snaptime$$ <= :1
  
  
  call     count       cpu    elapsed       disk      query    current        rows
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  Parse        1      0.00       0.00          0          0          0           0
  Execute      1      0.71       0.70      55946      56012          3           2
  Fetch        0      0.00       0.00          0          0          0           0
  ------- ------  -------- ---------- ---------- ---------- ----------  ----------
  total        2      0.71       0.70      55946      56012          3           2
  
  Misses in library cache during parse: 1
  Misses in library cache during execute: 1
  Optimizer mode: CHOOSE
  Parsing user id: SYS   (recursive depth: 1)
  
  Rows     Row Source Operation
  -------  ---------------------------------------------------
        0  DELETE  MLOG$_ACTION (cr=56012 pr=55946 pw=0 time=702813 us)
        2   TABLE ACCESS FULL MLOG$_ACTION (cr=56012 pr=55946 pw=0 time=1814 us)
  
  
  Elapsed times include waiting on following events:
    Event waited on                             Times   Max. Wait  Total Waited
    ----------------------------------------   Waited  ----------  ------------
    db file scattered read                       3530        0.00          0.39
    db file sequential read                        33        0.00          0.00
  ********************************************************************************

  Could someone explain why the the SELECT/UPDATE/DELETE on MLOG$ _ACTION if 'expensive' when it should be only 2 rows (the old value and the new value) in this newspaper after an update? I could do to improve the performance of the update?
  
  Let me know if you need more info... would be happy to provide.

  My guess would be that you were once a very large transaction that inserted a large number of rows in this table. So the table segment is big enough now and the high watermark is average at the end of this segment, causing a full scan table to analyze a large number of empty blocks and retrieve the two lines.

  You can issue a truncation on this table of $ MLOG: which would free up the empty blocks and brings back the high-watermark in the first block.

• Fast refresh view Matt

  Hi all

  http://docs.Oracle.com/CD/B19306_01/server.102/b14223/basicmv.htm#i1006519

  Fast refresh for a materialized view containing joins and aggregates is possible after any type of DML for the base tables (direct load or conventional INSERT , UPDATE , or DELETE ). It can be set to refresh ON COMMIT or ON DEMAND . A REFRESH ON COMMIT materialized view will be updated automatically when a transaction that is DML to one of the details of the materialized view commits tables. The time required to perform the validation may be slightly longer than usual when this method is selected. This is because the refresh operation is performed as part of the validation process. Therefore, this method may not be suitable if many users at the same time change the tables on which is based the materialized view.

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  S SALES, products p

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  How can I update the matte view after a DML statement is executed?

  With the help of Oracle 11 g Release 11.2.0.4.0

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  It was missing an index for a column in one of my big table.

  Thanks for your help.

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  THX

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