is there a way to manually lock a table?

is there a way to manually lock a table?

 

  

is there a way to manually lock a table in oracle 7.2.3?
i want to run a batch program on a table while there is online processing.
i want to lock the table if possible. or do i just revoke all from the
users abl to use the table and then grant them back?
thanks.


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