indexes & create table performance - response (2) by pirrejo

Thanks.  My main reason for asking is that query performance (select on its own) is very fast...15 seconds or so.  Creation of the table (e.g. create mytable as (select etc etc etc) with data primary index etc etc) for the same query is taking 4 or 5 minutes, so my thought was that the lag in completion time was due to indexes as opposed to select.