How to avoid extra costs datasocket?

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• How to avoid the SORT operation.

  Hi gurus,
  
  Oracle version is 11.1.0.7
  
  I have a select query that has Row_number() over (Partition of col1, col2 order by col1, col2 desc nulls last) function to eliminate the DUP on these two passes.
  
  Here it costs 4639 for sorting. Now, I added a two other columns in the query Select (has not changed the Row_number analytic function).
  
  COST of sorting is now 555635.
  
  This sort operation may use Temp table space. How to avoid the cost of SORTING.
  
  Note: I use the function analytical only to eliminate duplicates on Col1 and Col2 only.
  
  How to sort takes a large part of the COSTS by adding only two columns in the select list.
  
  
  Any Suggestions...?
  
  
  Thank you
  Mike

  I would say:
  1 don't worry unnecessarily about the cost of sorting - do you know if you have a problem.

  2. in general, eliminate from the beginning, sort late (i.e. After you have eliminated all you can)

  3. If you are concerned by the outpouring sort on the disc then you could go to manual management of pga (assuming that you are currently using automatic) for this particular operation and override sort_area_size.

• How to avoid the error ORA-01858:

  Hi all
  I use apex 4.1.
  I tried a query while dealing with the dates I had error, but I did not how to avoid it.
  like trying to get the number of students joined between certain dates.
  declare
  SMO varchar2 (100);
  SDO varchar2 (100);
  SYO varchar2 (100);
  SYDS varchar2 (100);
  SYDE varchar2 (100);
  a varchar2 (100);
  b the number;
  D1 date;
  D2 date;
  Start
  Select to_char(sysdate,'MM'), to_char(sysdate,'DD'), to_char(sysdate,'YYYY') in SMO, SDO, SYO double;
  SYDS: = '0602' | SYO;
  SYDES: = '0902' | SYO;
  D1: = to_date(SYDS,'MM/DD/YYYY');
  D2: = to_date(syde,'MM/DD/YYYY');
  run immediately "select |" TO_CHAR (DATE_OF_JOIN, "YY"), (TOTAL_NO_STUDENTS) Count of CROP_SALE where class = 7 and to_char (DATE_OF_JOIN, "YYYY") = to_char (sysdate, "YYYY") and to_date (to_char (DATE_OF_JOIN), "MM/DD/YYYY") > to_date(''d1'',''MM/DD/YYYY'') and to_date(DATE_OF_JOIN,''MM/DD/YYYY'') < to_date(''d2'',''MM/DD/YYYY'') group to_char (DATE_OF_JOIN "AA")' has , b ;
  dbms_output.put_line(a|| b);
  end;
  This error comes in dates d1 & d2 referring, but I did not how slove it.
  can someone help me pls
  Kind regards
  Pavan

  There are two types of errors that I see. First, fix the date format before removing the slashes (because the source has no slash).

  D1: = to_date (SYDS, 'MMDDYYYY');
  D2: = to_date (SYDE, 'MMDDYYYY');

  Secondly, in the statement immediately execute you put in the text "d1" and "d2", not the values of d1 and d2. You must either concatenate the values like this:

  to_date('||) D1 |', "MM/DD/YYYY)

  Or better yet, use bind variables like this:

  to_date(:B1,''MM/DD/YYYY'')

  and add a "using" clause

  using d1, d2;

  I made the changes in the code. Try this:

  declare
    SMO  varchar2(100);
    SDO  varchar2(100);
    SYO  varchar2(100);
    SYDS varchar2(100);
    SYDE varchar2(100);
    a    varchar2(100);
    b    number;
    d1   date;
    d2   date;
  begin
    select to_char(sysdate, 'MM'),
           to_char(sysdate, 'DD'),
           to_char(sysdate, 'YYYY')
      into SMO, SDO, SYO
      from dual;
    SYDS := '0602' || SYO;
    SYDE := '0902' || SYO;
    d1   := to_date(SYDS, 'MMDDYYYY');
    d2   := to_date(SYDE, 'MMDDYYYY');
    execute immediate 'select to_char(DATE_OF_JOIN,''YY''),
                       COUNT(TOTAL_NO_STUDENTS)
                       from CROP_SALE
                       where class=7
                       and to_char(DATE_OF_JOIN,''YYYY'')=to_char(sysdate,''YYYY'')
                       and to_date(to_char(DATE_OF_JOIN),''MM/DD/YYYY'') > :B1
                       and to_date(DATE_OF_JOIN,''MM/DD/YYYY'') < :B2
                       group by to_char(DATE_OF_JOIN,''YY'')'
      into a, b
      using d1, d2;
    dbms_output.put_line(a || b);
  end;
  

  Edit: Fixed the to_date function, which operated on a date. Also fixed an extra | After the selection

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  Piotr Plecke

  Hello
  in this case it would be interesting what Type of laptop it is exactly.

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  Please send additional information!

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