Raising exceptions in PL/SQL

Question

Hi Friends
I have the following code:
declare
var1....
var2....
cursor c1
begin
insert stmt;
update stmt;
update stmt;
for r1 in c1 loop
end loop;
end;
I will be having about 6-7 million rows every month to process. To raise exceptions, I am thinking of either of the following options:
Option 1_
declare
var1....
var2....
var3 exception;
var4 exception;
var5 exception;
cursor c1
begin
insert stmt;
update stmt;
IF SQL%NOTFOUND then
var3;
end if;
update stmt;
IF SQL%NOTFOUND then
var4;
end if;
for r1 in c1 loop
end loop;
IF SQL%NOTFOUND then
var5;
end if;
Exception
when var3 then blah blah
when var4 then blah blah
when var5 then blah blah
end;
Option 2_
declare
var1....
var2....
cursor c1
begin
insert stmt;
update stmt;
update stmt;
for r1 in c1 loop
end loop;
Exception
when others then blah blah
end;
In terms of performance, which option is better? And is there any better option?
Thanks....

Answer 1

In terms of performance, which option is better? And is there any better option?If you consider in terms of performance i think you cant find any difference in both ways.
But your both code does not do the same thing. They are entirely different. They are not the same.
For example, If your UPDATE statement fails with a Too many rows error what will happen.
In the first procedure the procedure will raise the error to the client. But in the second case the error is caught by the WHEN OTHERS block.
So now here the real thing is what you do in the WHEN OTHERS block. Do you suppress the error? Do you return NULL? What do you do, That is what matters.
Your Bla..Bla..Bla.. part in the EXCEPTION is very important. Most of them do mistake there.
WHEN OTHERS is a great feature. But it must be used properly. Its like a very sharp knife. If you dont use it properly there will be blood.