differnce between Ref Cursor strong and weak Ref Cursor

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• DIFFERENCE BETWEEN THE STRONG AND THE SLIDERS OF THE WEEK IN ORACLE

  Hi all
  
  Can someone tell me please... What the Ref cursor.in, in which case we use the ref cursor .and what is difference between strong and week ref cursor.
  
  Thanks in advance,
  Sanjeev.

  Hello

   What is Ref Cursor :
  ---------------------------------------------------------------------------------------
  
  -->It is aslo a user defined type
  -->ref cursor allows you to declare the  cursor variable those are independent of select statement
   i .e
     the cursor variable declared using ref cursor type is ready to accept any select statement dynamically at the time of opening
  
  -->Ref cursor are of two types
  
    1) A Strong ref cursor(also called static structure type)
  2)Weak ref cursor(also  called dynamic structure type )
  
  1)Strong ref cursor:
  -->When return type included then it is called strong or static structure type
  -->static ref cursor support different  type of select statement but all of same strucure ,but not neccessary that the table should be same
  2)Weak Ref  Cursor:
  
    this ref cursor allows us to any  type of select statement irrespective of data structure . i .e any table
  
  Ref Cursor:
  
  Syntax:
    type  is ref cursor [return ];
  syntax for open statement:
    open  for select statement .......;
  

  Example of strong cursor

   --------Strong cursor ----------------------
  
   declare
  
   type emprefcur is ref cursor return emp%rowtype;
   ec emprefcur;
   v_ec ec%rowtype;
  begin
    open ec for select * from emp;
   loop
        fetch ec into v_ec;
        exit when ec%notfound;
       print(v_Ec.empno);
       print(v_ec.ename);
   end loop;
  close ec;
  
   print('-------------------------------------------------------------------------'):
    open ec for select * from emp;
   loop
        fetch ec into v_ec;
        exit when ec%notfound;
       print(v_Ec.empno);
       print(v_ec.ename);
   end loop;
  close ec;
  
   end;
  

  Example of low slider
  -------------

  declare
  ------------------weak cursor --------------------------
  type refcur is ref cursor;
   xc refcur;
  v_Ec emp%rowtype;
  v_dc dept%rowtype;
  begin
    open xc for select * from emp;
  loop
       fetch xc into v_ec;
   exit when xc%notfound;
    print(v_ec.ename);
    print(v_Ec.empno);
  end loop;
  
  close xc;
  
  print('--------------------------------------');
  open xc for select * from dept;
  loop
       fetch xc into v_dc;
       exit  when xc%notfound;
    print(v_dc.deptno);
    print(v_dc.dname);
    print(v_dc.loc);
  
  end loop;
  close xc;
  
  end;
  

  Thank you
  Prakash P

  Published by: prakash on December 19, 2011 21:14

• What is the Differnce between HashMap and HashTable?

  Hi all
  
  What is the Differnce between HashMap and HashTable?
  
  I'm confuse. !!
  
  
  Thanks to advnce.

  This question is answered in the Javadoc here http://download.oracle.com/javase/6/docs/api/java/util/HashMap.html and here http://download.oracle.com/javase/6/docs/api/java/util/Hashtable.html. The thread to block.

  Published by: EJP on 12/07/2010 13:27

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  Hey experts,.
  What is the exact differnce between below 2 statements
  
  1
  

  dbms_stats.GATHER_SCHEMA_STATS( user , method_opt => 'FOR ALL COLUMNS SIZE AUTO', options => 'GATHER EMPTY' , degree => 4 ) ;

  2nd
  

   dbms_stats.GATHER_SCHEMA_STATS( user , method_opt => 'FOR ALL COLUMNS SIZE AUTO', options => 'GATHER STALE' , degree => 4 ) ; 

  Documentation for GATHER_SCHEMA_STATS :

  + STALE GROUPING: collects statistics on obsolete objects as determined by looking at the views of tabmodifications. Also, return the list of items found to be stale. +

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  Hello
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  Best regards
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  Hi Jan,

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• Time difference between extraction in bulk and standard fetch?

  Hello world

  I have performed below block in the SCOTT schema for the gap between the standard extraction and extraction block. I read that extraction is more standard fast recovery. How ever the results were opposed as shown below.

  Resut

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

  PL/SQL procedure successfully completed.

  the extraction time is 114

  the time required for extraction bulk is 136

  Block I ran

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

  declare

  type owner_name_t is table of the all_objects.object_name%type;

  owner_c owner_name_t;

  object_name_c owner_name_t;

  number of l_start;

  number of l_end;

  cursor c1 is

  Select the owner, object_name object;

  Start

  l_start: = dbms_utility.get_time;

  I'm in c1

  loop

  null;

  end loop;

  l_end: = dbms_utility.get_time;

  dbms_output.put_line (' the extraction time is ' |) (l_end-l_start)) ;

  l_start: = dbms_utility.get_time;

  -car me in c1

  Open c1;

  loop

  When exit c1% notfound;

  collect the fetch c1 into loose in owner_c, object_name_c;

  end loop;

  Close c1;

  l_end: = dbms_utility.get_time;

  dbms_output.put_line (' bulk is the time needed to extract ' |) (l_end-l_start)) ;

  end;

  Can someone suggest as to why it happened?

  Thanks and greetings

  580988 wrote:

  Hello world

  I have performed below block in the SCOTT schema for the gap between the standard extraction and extraction block. I read that extraction is more standard fast recovery. How ever the results were opposed as shown below.

  Can someone suggest as to why it happened?

  Thanks and greetings

  Well I run your code using Oracle 12 c and based on your query in your cursor may be the first time that it will be a little different but then I noticed your code and I wonder... WHY you BULK COLLECT within the loop?

  That's the whole point of the bulk to pick you up.  Get you ONCE... in 'bulk '.

  Here is your code changed on my db and my result set

  SET SERVEROUTPUT ON
  
  DECLARE
  
     TYPE owner_name_t IS TABLE OF all_objects.object_name%TYPE;
  
     owner_c         owner_name_t;
     object_name_c   owner_name_t;
     l_start         NUMBER;
     l_end           NUMBER;
  
     CURSOR c1 IS
        SELECT owner
              ,object_name
          FROM all_objects;
  
  BEGIN
  
     l_start := DBMS_UTILITY.GET_TIME;
  
     FOR I IN c1 LOOP
        NULL;
     END LOOP;
  
     l_end := DBMS_UTILITY.GET_TIME;
  
     DBMS_OUTPUT.PUT_LINE ('The time required for fetch is ' || TO_CHAR(l_end - l_start)));
  
     l_start := DBMS_UTILITY.GET_TIME;
  
     OPEN c1;
  
     --LOOP
        --EXIT WHEN c1%NOTFOUND;
  
     DBMS_OUTPUT.PUT_LINE('Fetching bulk collect');
  
     FETCH c1
      BULK COLLECT
      INTO owner_c, object_name_c;
  
     --END LOOP;
  
     CLOSE c1;
  
     l_end := DBMS_UTILITY.GET_TIME;
  
     DBMS_OUTPUT.PUT_LINE ('The time required for bulk fetch is ' || TO_CHAR((l_end - l_start)));
  
  END;
  /
  

  Result set

  

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