linuxidc@LINUXIDC11> create table seg_test( x int primary key, y varchar2(20));

Table created.

linuxidc@LINUXIDC11> select owner,header_file,header_block,bytes,blocks,extents from dba_segments where segment_name = 'SEG_TEST';

no rows selected ---没有初始化是数据， 所以还没有段

linuxidc@LINUXIDC11> insert into seg_test values(1,'linuxidc');

1 row created.

linuxidc@LINUXIDC11> commit;

Commit complete.

linuxidc@LINUXIDC11> select owner,header_file,header_block,bytes,blocks,extents from dba_segments where segment_name = 'SEG_TEST';

OWNER                          HEADER_FILE HEADER_BLOCK      BYTES    BLOCKS    EXTENTS
------------------------------ -----------      ------------      ---------- ---------- ----------
linuxidc                                    4                  57858            65536          8          1

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