Collection in PL/SQL

Question

Hi...All,
I write procedure by declaring cursor then using for...loop to insert data into table now i decide to change program by using collection data type and use command BULK COLLECT INTO....
But the cursor is come from joining three tables like this:
v_rec t4%rowtype;
cursor c1 is select ..... from t1,t2,t3 where .... ;
for i in c1 loop
statements,
v_rec.col1 := c1.col1;
statements,
insert into t4 values (...)
end loop;
commit;
How to declare the Table data type variable
TYPE NameTab IS TABLE OF .... ?
Thank you,
Mcka

Answer 1

> fetch beta bulk collect into b;
Obviously an example - but note that the LIMIT clause should always be used when putting a bulk fetch like this into production code.
So just to add to dnikiforov posting... :
If you do not manage the size of the array, you run the risk of seriously increase the PGA size of the Oracle process and causing a huge performance impact on the server due to extensive memory swapping.
The basic template is:
loop
fetch <cursor> into <buffer> limit <number>;
for i in 1..<buffer>.Count
loop
<process buffer(i) >
end;
exit when <cursor>%NOTFOUND;
end loop;
Note the exit test is at the end of the loop - not just after the FETCH command with a single row fetch. Reason: the LIMIT could be a 100 and only 10 rows are fetched. %NOTFOUND is true. However you first want to process those 10 rows before exiting the loop - thus this exit loop condition is moved to after the processing of the fetch buffer array.