NOTE: I am not a dba. :)
I have a database table that a client needs to set a column's default value. This table has 1.5mil+ records in it and this column is already populated on all existing records (they do this manually right now). They would like this column to be set automatically on all new records that their users create.
Would it cause down time or any major latency issues to set this column's default value during business hours?