Not able to bind variable Fusion Dev Guide Document clearly as follows.

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• Using Bind Variable in a SELECT statement

  Hello
  
  I am trying to build my SQL query running using bind variables and in Oracle® Fusion Middleware Fusion developer Guide for Oracle Application Development Framework 11 g Release 1 (11.1.1) it is said that ' after you define bind variables, the next step is to reference them in the SQL statement. While SQL syntax allows you to bind variables to appear in the SELECT list and in the WHERE clause, you'll generally use them in this context, as part of your WHERE clause. ».
  
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  When you write a SQL for the application, I want to do some performance testing of SQL before providing to JAVA developers. I understand that I need to test using bind variables, can someone guide me how do? What are the best tools out there to achieve? Please provide some guidance. Thank you!

  Rinne says:
  I read more about bind variable and I can test the use of bind variables. I understand that testing SQL using bind variables is a closer representation of the real world. Even when queries have large tables, the performance would be similar if I run the query using literals twice (to avoid hard analysis) compared to tests with bind variables? I am trying to understand more thoroughly the need for tests with bind variables. Why we take more time than the other? Thank you!

  The main thing is that the opimizer will / can do if bind variables different optimization techniques are used or not.
  There are two contradictory effects its regarding the binding settings.

  Effect 1: Reuse of cursor
  If the same is done again and again and again. Maybe different sessions. Then using binding settings is essential. Why? Because the same cursor can be reused, which saves a lot of time for analysis. This occurs mainly in OLTP systems. The idea behind this is that to do the same action, just for a different ID (ID in order for example) will result in an identical implementation plan.

  The result: Faster analysis time and less consumption of memory, because the same cursor can be resused between different sessions.

  Effect 2: Correct assumptions

  According to a filter expression, some using the value of the OBC will make an assumption based on statistical data the number of rows is returned because of this expression and the value.
  Speculation between a literal value and a bound value may be different. In many cases exist technical opimization (bind peeking etc.) to the same literal conjecture binded proposal.

  But there are exceptions, for example a condition such as the following will result in different estimates

  column between 10 and 20
  

  column between :P1 and :P2
  

  There are as well other effects.

  Result: The CBO can make assumptions better if literals. But most of the cases the proposal is identical.

  Conclusion: Literal values are useful if you do large queries where the output size depends strongly on the parameters provided, and where you run that very few of these (OLAP) queries.
  Binding settings are usfull when the same execution (OLTP) need a grand plan number of queries.

• Get the bind variables name string SQL or the cursor

  Hello
  
  Is there way to get of the bind variables name string SQL or the cursor?
  
  Example of

  DECLARE
    l_sql VARCHAR2(2000);
    desctab DBMS_SQL.DESC_TAB;
    curid   PLS_INTEGER;
  BEGIN
  
    l_sql := 'SELECT * FROM emp WHERE mgr = :X and deptno = :Y';
  
    curid := dbms_sql.open_cursor;
    dbms_sql.parse(curid, l_sql, dbms_sql.NATIVE);
    ....
  END;

  What I mean with the SQL string:
  I love to get using some functions from above code variable l_sql all the bind variable.
  In this case the function should return array where is for example: X and: Y
  
  Back to bind the cursor variable names, I mean same but rather string I pass number of cursor.
  
  Y at - it sucks ready function or some may share a code customized for this purpose?
  
  Thanks
  
  Kind regards
  Jari
  
  http://dbswh.webhop.NET/dbswh/f?p=blog:Home:0Regards,
  
  Published by: jarola December 19, 2011 02:44
  
  I found there are wwv_flow_utilities.get_binds of the function not documented in APEX packages that do what I want.
  Usage example

  set serveroutput on
  DECLARE
    binds DBMS_SQL.varchar2_table;
  BEGIN
    binds := wwv_flow_utilities.get_binds('select :P1_TEST from dual');
    FOR i IN 1 .. binds.count
    LOOP
      dbms_output.put_line(binds(i));
    END LOOP;
  END;
  /
  
  anonymous block completed
  :P1_TEST

  But I would not use these functions without papers as those who can change or there is no future versions APEX.
  Is there a documented function or the custom function that do the same thing as wwv_flow_utilities.get_binds?

  Some old basic example code of my friends. Also the media getting the bind variable of PL/SQL code blocks anon.

  SQL> create or replace function GetBindVariables( statement varchar2 ) return TStrings is
    2          --// bind variables names are terminated by one the following special chars
    3          SPECIAL_CHAR    constant TStrings := TStrings(' ',')','+','-','>','<','*',',','=',';',CHR(10),CHR(13));
    4
    5          --// max size of a bind var name
    6          MAX_VARSIZE     constant integer := 100;
    7
    8          pos     integer;
    9          pos1    integer;
   10          occur   integer;
   11          varName varchar2(100);
   12          varList TStrings;
   13  begin
   14          varList := new TStrings();
   15
   16          --// looking for the 1st occurance of a bind variable
   17          occur := 1;
   18
   19          loop
   20                  pos := InStr( statement, ':', 1, occur );
   21                  exit when pos = 0;
   22
   23                  varName := SubStr( statement, pos, 100 );
   24
   25                  --// find the terminating char trailing the
   26                  --// bind variable name
   27                  pos1 := Length( varName );
   28                  for i in 1..SPECIAL_CHAR.Count
   29                  loop
   30                          pos := InStr( varName, SPECIAL_CHAR(i) ) - 1;
   31                          if (pos > 0) and (pos < pos1) then
   32                                  pos1 := pos;
   33                          end if;
   34                  end loop;
   35
   36                  --// extract the actual bind var name (without
   37                  --// colon char prefix)
   38                  varName := SubStr( varName, 2, pos1-1 );
   39
   40                  --// maintain a unique list of var names
   41                  if not varName member of varList then
   42                          varList.Extend(1);
   43                          varList( varList.Count ) := varName;
   44                  end if;
   45
   46                  --// look for the next occurance
   47                  occur := occur + 1;
   48          end loop;
   49
   50          return( varList );
   51  end;
   52  /
  
  Function created.
  
  SQL>
  SQL> select
    2          column_value as BIND_VAR
    3  from TABLE(
    4          GetBindVariables('select * from foo where col=:BIND1 and day = to_date(:B2,''yyyy/mm/dd'')')
    5  );
  
  BIND_VAR
  ------------------------------
  BIND1
  B2
  
  SQL> 
  

  PS. just realize this code is case-sensitive, while variable bind is not. Should throw a upper() or lower() by adding the name of the var to the list - never really a problem for me because I'm pretty tense when it use cases correctly in the code. ;-)

  Published by: Billy Verreynne, December 19, 2011 06:19

• Can OBIEE use Bind Variables?

  I doubt that it would be used for warehouse queries, but I'm the question arises. Has anyone used in OBIEE?
  
  [Here is a brief summary about them. | http://www.akadia.com/services/ora_bind_variables.html]

  I checked with the support of Oracle and it's official - OBIEE does not support the bind variable.

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• How to get SQL that do not use bind variables

  Hello
  
  I am trying to identify the SQL code which should benefit from the use of bind variables.
  First of all, I tried to get the common signature of all the sql calls, using:
  

  select * from (
  select  force_matching_signature, count(1) from v$sql where force_matching_signature<>0 group by force_matching_signature order by 2 desc
  ) where rownum < 50;

  Then I copied these values to the Clipboard and run:

  select sql_text from v$sql where force_matching_signature=<<<copied_signature_value>>>;

  Now, I want to make it automatically and get only 1 occurrence of each SQL that resembles others by using a query.
  
  I tried this:
  

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  (
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  Thank you

  And I said. First use the command by then use rownum. I did not mention row_number. Also, there should be no need to add more columns.
  Have you tried it? Why it did not work?

  example not tested

  select * from (
     select sql_text from (select sql_text, force_matching_signature, row_number() over (partition by force_matching_signature order by sql_text desc) rn from v$sql where force_matching_signature != 0)
     where rn = 1
     order by force_matching_signature desc /* add any ordering you like here */
     )
  where rownum < 10  /* then filter on the first 10 results */
  

  If you want to order that the statement that found most of the time comes first, say so. However, I don't see how to group in your case.
  Maybe like this

  example of tested

  select * from (
     select cnt, sql_text
     from (select sql_text, force_matching_signature, row_number() over (partition by force_matching_signature order by sql_text desc) rn , count(*) over (partition by force_matching_signature) cnt
           from v$sql
           where force_matching_signature != 0)
     where rn = 1
     order by cnt desc, force_matching_signature desc /* add any ordering you like here */
     )
  where rownum < 10  /* then filter on the first 10 results */
  ;
  

  Published by: Sven w. October 11, 2012 14:49

  Published by: Sven w. October 11, 2012 14:51

  Published by: Sven w. on October 11, 2012 14:56 - number column added to the output

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  Can someone let me know the exact reason for this, and what about the talks of error?
  
  Thank you
  Uday
  
  Published by: Udaya Shankara Gandhi on June 13, 2012 03:30

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