alter system set deferred_segment_creation=true;show parameter deferred_segment_creation
droptable justForTest;createtable justForTest(test1 varchar2(2));select segment_name, BYTES, BLOCKS, EXTENTS from user_segments where segment_name='JUSTFORTEST';
alter system set deferred_segment_creation=false;show parameter deferred_segment_creation
droptable justForTest;createtable justForTest(test1 varchar2(2));select segment_name, BYTES, BLOCKS, EXTENTS from user_segments where segment_name='JUSTFORTEST';