I have been asked to look at an Oracle 6 DB problem and can't get to the bottom of it. I only have access via a dialup modem at 9.6 kbaud.

The error that is appears when trying to insert into a table, 'ORA-01556: maximum number of 57 extents exceeded' the table in question has max extents set to 800, I have added a datafile to the tablespace that the table resides in with no success.

Any ideas?
(I know an Oracle 6 DB is past its sell by date - but a shiny new system is on the horizon)