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

Tags: Database

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