> So,
> the connections that will see the new data won't be able to
> access data until that
> transaction has finished the 'commit' stage, or will they be able
> to read some of the records
> while the importation is partially done?
The former. Other transations won't see the data and also because you went:
LOCK TABLE IN ACCESS EXCLUSIVE MODE
or something, they won't even be able to access the tables...
Chris