COPY and index updating

PG 8.2.4

Hello -

I need to append rows to an existing table that is in a production db.
There are 60 fields in the table and 17 indexes, including the primary key.
I cannot drop the indexes because the data is being actively accessed by
users. I can't create a duplicate table because we do not have enough disk
storage to do so at this time.

I believe that the SQL COPY statement will delay updating the indexes until
after it has inserted the rows because (again, I believe) the copy is
treated as a single transaction that either succeeds or fails.

I would appreciate knowing if I am correct about this.

Thank you,

David