Consistent gets -- question

Hello All,
 I have a situation....
We are running an etl process into a fact table has 15 fk's enabled (no indexes associated) During the session's run i did a trace session and this is the result from tkprof

Execute   1175     23.09      23.22         10(disk)  3616(query) 
1092396(current)       56400 (rows)

As you can see there is a huge amount of current gets for 56400 rows.

Now i removed all the constraints and ran the session again. this is the result..

Execute   3520     29.60      29.02          0       6796(query)     
14530  (current)     168960 (rows)

The result shows very minimal current gets for a lot more rows than previous one.

For some reason i am under the immpression that the current gets should at least match the number of rows inserted (or it is only for update/delete ??)
The 2nd result disproves that..
Please help me understand...

Also i had seen in one of the metalink replies by the oracle tech that

"""the number of 'query' divided by the number of rows comes out to about 9 gets/row, which is not unreasonable. The number of 'current' divided by the number of rows is quite a bit higher at 33 gets/row, but may not be unreasonable,""""

What is a resonable/unreasonale number for query get/row and current get/row

Thanks,

Sat

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