Simple insert or bulk insert

Question

Hi,
Hi have a problem regarding the bulk insert.
I have 4 tables and each table has 16 partitions and each table near 2,00,000 records i am inserting
Previously i tried bulk insert ..
open insert_tab1;
loop
fetch insert_tab1 bulk collect into type_insert_tab1 limit 40000; --- fetch is near 2,00,000 records
forall i in 1..type_insert_tab1.count
insert into tab1 values type_insert_tab1(i);
commit;
exit when insert_tab1%notfound;
end loop;
Now similar insert i did for three other tables with the commit statementand in each table approx 2,00,000 records we are inserting.
But i got snapshot too old error.how i can modify this to reduce commit and buffer use an dless execution time.
or shall i take only insert into tab1
(col1,
col7)
select *from tab2;
Thanks in advance

Answer 1

But i got snapshot too old error.how i can modify this to reduce commit and buffer use an dless execution time.You can reduce the number of commits by taking the commit out of the loop.
It might be worth looking at the execution plan of the cursor in case it is less efficient than it could be.
@ user11087632:
Direct path insert uses fewer system resources, not more.
The target table would need to be defined as NOLOGGING to get the full benefit; also indexes will affect direct path performance, and any foreign key constraints or row-level triggers will make it silently revert to conventional insert. And of course you lose the logging.
Edited by: William Robertson on Jun 4, 2009 11:23 PM