compare the process with normal insert insertion and nested table inserts

Hi gurus,

I need to insert data block (in Millions of records) in my table. What is the best option

(1) normal insert

INSERT / * ADDING * / into table

Select * from table1

(2) declare

n_table table % rowtype;

n_table ins_table;

Start

Select * BULK collect into ins_table

FROM table1

forALL i in ins_table.first... ins_table.last

insert into table values (ins_table (i));

commit;

end;

Please notify.  and comeout with valid arguments.

Thank you

S

If the destination table is empty, then you can do ETG (CREATE TABLE AS SELECT...). This would be by far the fastest way. But to choose one of the choices you gave, the top hand is the first.

The second option is a very bad idea. Collection of PL/SQL uses PGA. Millions of PGA data costs very expensive. And also this approach doesn't give not any kind of performance on simple INSERT INTO SELECT...

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