The dml not giving a correct value back in variable

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• date function will not return a correct value

  I used the following code to only display the value for the last seven days. It works very well in the home page (www.dealfindit.com), but in the other page as category (www.dealfindit.com and click on MP3)

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• Parallel DML may be downgraded to the DML series?

  Oracle Database Enterprise Edition 11.2.0.3.0

  When you run a parallel query (e.g. SELECT * FROM parallel_table WHERE a <?), the optimizer may choose a parallel or series, the selectivity of the predicate function plan and availability different access roads - usually a scan interval series index for highly selective queries (a small number of return lines), and a parallel table full scan for less selective queries (returning a large number of lines).

  However, with parallel DML enabled, no such optimization seems to happen. There may be a very effective for a query as series plan "DELETE FROM parallel_table WHERE a <? ', but once parallel DML is activated, the optimizer based on CSSTidy always seems to choose a parallel plan.

  Is there a way to allow the optimizer to choose between series and parallel DML according to predicates in the query? I wish I could enable parallel DML, but knowing that, in the case of a very selective, query optimizer will not parallel DML use but will use a series DML.

  Note that I'm allowing to the DML, not no force in parallel it (although it seems more to do with the fact that a table series is considered parallel, without having to refer to the query).

  Here is an example of this behavior, deleted 18 m rows in a table of rows of 300 m:

  First, the cost of a DML series operation is 59,000, using an index to access the lines:

  COMMIT;

  ALTER SESSION DISABLE PARALLEL DML.

  DELETE

  OF parallel_table

  WHERE the DATETIME_a < sysdate - 650;

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

  | ID | Operation | Name                    | Lines | Bytes | Cost (% CPU). Time |

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

  |   0 | DELETE STATEMENT.                         |    18 M |  2037M | 58723 (1) | 00:11:45 |

  |   1.  REMOVE | PARALLEL_TABLE |       |       |            |          |

  |*  2 |   INDEX RANGE SCAN | IDX_PT_DATETIME_A |    18 M |  2037M | 58723 (1) | 00:11:45 |

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

  Now, by allowing parallel DML, the optimizer chooses a parallel full table much more expensive for the same request, cost 926 000 scan. Why he won't come back in terms of the series?

  COMMIT;

  ALTER SESSION ENABLE PARALLEL DML.

  DELETE

  OF parallel_table

  WHERE the DATETIME_a < sysdate - 650;

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

  | ID | Operation | Name               | Lines | Bytes | Cost (% CPU). Time |    TQ | IN-OUT | PQ Distrib.

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

  |   0 | DELETE STATEMENT.                    |    18 M |  2037M |   926K (1) | 03:05:22 |        |      |            |

  |   1.  COORDINATOR OF PX |                    |       |       |            |          |        |      |            |

  |   2.   PX SEND QC (RANDOM). : TQ10001 |    18 M |  2037M |   926K (1) | 03:05:22 |  Q1, 01 | P > S | QC (RAND) |

  |   3.    INDEX MAINTENANCE | PARALLEL_TABLE |       |       |            |          |  Q1, 01 | SVCP |            |

  |   4.     RECEIVE PX |                    |    18 M |  2037M |   926K (1) | 03:05:22 |  Q1, 01 | SVCP |            |

  |   5.      RANGE OF SEND PX | : TQ10000 |    18 M |  2037M |   926K (1) | 03:05:22 |  Q1 00 | P > P | RANGE |

  |   6.       REMOVE | PARALLEL_TABLE |       |       |            |          |  Q1 00 | SVCP |            |

  |   7.        ITERATOR BLOCK PX |                    |    18 M |  2037M |   926K (1) | 03:05:22 |  Q1 00 | ISSUE |            |

  |*  8 |         TABLE ACCESS FULL | PARALLEL_TABLE |    18 M |  2037M |   926K (1) | 03:05:22 |  Q1 00 | SVCP |            |

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

  Dan.Jan wrote:

  So in summary, by adding a second index to the table, the optimizer computes a much higher estimate of the costs for the use of a scan of the index systematic range. As a result, he opts for the full table scan, which is not necessarily the most efficient plan. I am inclined to think that it is a bug with optimizer, as much as it manifests itself only in the line superior (0) plan.

  It's a pretty good reason to be suspicious - and I think you are right that it is a bug.

  The cost of a removal is the cost of the selection the ROWID of the lines to remove, which is in this very simple case: ' selectivity * leaf_blocks ' for the index. However, when you create the second FINAL cost index seems to change to "selectivity * (leaf_blocks + clustering_factor) ' (I ran your test case, tried a few simple variations and looked 10053 files trace - so my conclusion is not a complete analysis of the question.)

  Since you have a test case, raise a SR with Oracle.

  Concerning

  Jonathan Lewis

  (Update: added missing 'leaf_blocks' to the 2nd expression)

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  Set comappstat = (select distinct)
  a.comappstat
  mnt.workorders a, mnt.workorders_copy b
  where a.workordersoi = b.workordersoi
  and a.comappstat! = b.comappstat)
  where a.comappstat! = b.comappstat
  and a.workordersoi = b.workordersoi
  
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  ERROR on line 8:
  ORA-00904: "B". "" WORKORDERSOI ": invalid identifier
  
  First of all, I don't see why the update statement does not work (it's probably obvious, but I'm not)
  
  Secondly, it is the best approach for updating a column (or columns) that are incorrect, with the columns in the same table which are correct, or is there a better way?
  
  I would sooner update the table rather than delete or truncate then re insert, as it was a trigger for insert/update I had to disable it on the notice re and truncate the table unusable a demand so I was re insert.
  
  Thank you

  Hello

  First of all, after post 79, you need to know how to format your code.

  Your last request reads as follows:

  UPDATE
    mnt.workorders_copy
  SET
    comappstat =
    (
      SELECT DISTINCT
        a.comappstat
      FROM
        mnt.workorders a
      , mnt.workorders_copy b
      WHERE
        a.workordersoi    = b.workordersoi
        AND a.comappstat != b.comappstat
    )
  WHERE
    a.comappstat      != b.comappstat
    AND a.workordersoi = b.workordersoi
  

  This will not work for several reasons:
  The sub query allows you to define a and b and outside the breakets you can't refer to a or b.
  There is no link between the mnt.workorders_copy and the the update and the request of void.

  If you do this you should have something like this:

  UPDATE
    mnt.workorders     A      -- THIS IS THE TABLE YOU WANT TO UPDATE
  SET
    A.comappstat =
    (
      SELECT
        B.comappstat
      FROM
        mnt.workorders_copy B   -- THIS IS THE TABLE WITH THE CORRECT (OLD) VALUES
      WHERE
        a.workordersoi    = b.workordersoi      -- THIS MUST BE THE KEY
        AND a.comappstat != b.comappstat
    )
  WHERE
    EXISTS
    (
      SELECT
        B.comappstat
      FROM
        mnt.workorders_copy B
      WHERE
        a.workordersoi    = b.workordersoi      -- THIS MUST BE THE KEY
        AND a.comappstat != b.comappstat
    )
  

  Speed is not so good that you run the query to sub for each row in mnt.workorders
  Note it is condition in where. You need other wise, you will update the unchanged to null values.

  I wouold do it like this:

  UPDATE
    (
      SELECT
        A.workordersoi
        ,A.comappstat
        ,B.comappstat           comappstat_OLD
  
      FROM
        mnt.workorders        A      -- THIS IS THE TABLE YOU WANT TO UPDATE
        ,mnt.workorders_copy  B      -- THIS IS THE TABLE WITH THE CORRECT (OLD) VALUES
  
      WHERE
        a.workordersoi    = b.workordersoi      -- THIS MUST BE THE KEY
        AND a.comappstat != b.comappstat
    ) C
  
  SET
    C.comappstat = comappstat_OLD
  ;
  

  This way you can test the subquery first and know exectly what will be updated.
  This was not a sub query that is executed for each line preformance should be better.

  Kind regards

  Peter

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