Oracle RAC and sql loader

hi all,
We have Oracle 10g RAC on IBM AIX
Today i will be uploading data in a table through sql loader.
I want that at the time of insertion only data which i am inserting goes into the table,As i am using sequence on particular column A.
Problem is If i shutdown database then i will not to able to insert data and if i doesnt shutdown db value for that column A is generated automatically when application works.
i have recommanded that we should stop connectivity of application with database then i will perform insertion but some people are saying no.Find other method
What steps should i do?

Ok i thing my question was not clear
I have table XYZ
A B C
1 2 3
4 4 5
if application is connected to database value to Coulmn is incremented
A B C
1 2 3
4 4 5
5 6 7
i have to insert into table XYZ using sql loader giving sequence (4,1) on column A.
But if it is connected to application it will give me error of PK.
as Value 5 is already inserted by application so how can i stop this.
so that i can have the max value of coulmn and start sequence
Hope this time make u clear.
sorry for bad english

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