FORALL and FOR when to use

Hi,
I am just confusing..what is the difference between FORALL and FOR.

Why it works?
declare
var1 varchar2(500);
type varray_type is table of varchar2(50);
v_varray varray_type;
begin
v_varray := varray_type('smith', 'king', 'jones');
for i in 1 .. 3 loop
var1 := var1 || ',' || v_varray(i);
end loop;
dbms_output.put_line(var1);
end;
OUTPUT: ,smith,king,jones
And why it is not..
declare
var1 varchar2(500);
type varray_type is table of varchar2(50);
v_varray varray_type;
begin
v_varray := varray_type('smith', 'king', 'jones');
forall i in varray.first .. varray.last
var1 := var1 || ',' || v_varray(i);
end loop;
dbms_output.put_line(var1);
end;
I am still confusing..can't we assign values to variable in FORALL?
please suggest me.

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Error in checking FORALL and FOR performance in PL/SQL.!

I am using FORALL and FOR construct' comparison in term of times taken by them(performance).
This is whats my problem:
SQL> SET SERVEROUTPUT ON;
SQL> CREATE TABLE T1(C1 VARCHAR2(100));
Table created.
SQL> declare
2 t1 number;
3 t2 number;
4 t3 number;
5 begin
6 for i in 1..10
7 loop
8 t1:=dbms_utility.get_time;
9 insert into t1 values('RAVIKANTH');
10 end loop;
11 t2:=dbms_utility.get_time;
12 forall i in 1..10
13 insert into t1 values('RAVIKANTH');
14 t3:=dbms_utility.get_time;
15 dbms_output.put_line('Time taken for FOR'||TO_CHAR((t2-t1)/100));
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17 end;
18 /
declare
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PLS-00435: DML statement without BULK In-BIND cannot be used inside FORALL
... dear friends, please help me out in resolving this.
Thanks in advance,
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Forall works with sets of data, like index-by tables. Here's an example:
declare
   t1 number;
   t2 number;
   t3 number;
   type r_tt is table of t%rowtype
      index by binary_integer;
   tt r_tt;
begin
   for i in 1..10
   loop
      t1:=dbms_utility.get_time; -- <----- this one should be outside the loop
      insert into t values('RAVIKANTH');
   end loop;
   t2:=dbms_utility.get_time;
   -- Load the index-by Table
   for i in 1..10
   loop
      tt (i).c1 := 'RAVIKANTH';
   end loop;
   -- Use this index-by Table to perform the Bulk Operation
   forall i in 1..10
      insert into t values tt (i);
   t3:=dbms_utility.get_time;
   dbms_output.put_line('Time taken for FOR'||TO_CHAR((t2-t1)/100));
   dbms_output.put_line('Time taken for FORALL'||TO_CHAR((t3-t1)/100));
end;You probably won't see much difference in elapsed time. You testing a single insert again a bulk operation.
btw: You have a local variable with the same name as your table

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FORALL and FOR when to use

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