if you use dbexport (-ss option) you can then drop
your database and then import .
If you have sufficient contiguous space
all tables will have exactly one extent allocated for them
Surely , new inserts will allocate another extent just immediatelly
If you dont want it to happen
you´ll have to modify the "next extent size" in your <database>.sql
as well as first extent size to give room for the table to grow
without allocating new extents
Tables that have more than 6 extents will cause a lower
performance in your apliccation