Copying many rows from one table to another

Could anyone tell me the best way to copy many rows (~1,000,000) from one table to another?
I have supplied a snipit of code that is currently being used in our application. I know that this is probably the slowest method to copy the data, but I am not sure what the best way is to proceed. I was thinking that using BULK COLLECT would be better, but I do not know what would happen to the ROLLBACK segment if I did this. Also, should I look at disabling the indexes while the copy is taking place, and then re-enable them after it is complete?
Sample of code currently being used:
PROCEDURE Save_Data
IS
CURSOR SCursor IS
SELECT     ROWID Row_ID
FROM     TMP_SALES_SUMR tmp
WHERE NOT EXISTS
(SELECT 1
     FROM SALES_SUMR
     WHERE sales_ord_no = tmp.sales_ord_no
     AND cat_no = tmp.cat_no
     AND cost_method_cd = tmp.cost_method_cd);
BEGIN
FOR SaveRec IN SCursor LOOP
INSERT INTO SALES_ORD_COST_SUMR
SELECT *
FROM TMP_SALES_ORD_COST_SUMR
WHERE ROWID = SaveRec.Row_ID;
RowCountCommit(); -- Performs a Commit for every xxxx rows
END LOOP;
COMMIT;
EXCEPTION
END Save_Data;
This type of logic is used to copy data for about 8 different tables, each containing approximately 1,000,000 rows of data.

Your best bet is
Insert into SALES_ORD_COST_SUMR
select * from TMP_SALES_ORD_COST_SUMR;
commit;
Read this
http://asktom.oracle.com/pls/ask/f?p=4950:8:15324326393226650969::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:5918938803188
VG

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                1111                   11                 8181 10-APR-2004
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                7777                   33                 8181 01-MAR-2002
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                2222                   11                 3131 11-MAY-2005
                3333                   44                 8181 08-JUN-1988
                5555                   11                 8066 01-JAN-2001
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Several possible ways to move the data occur to me, but the devil's in the details of how the data is currently arranged.
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                        Regards,
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