Oracle 11gR2 延迟段创建

dylan@DYLAN11> create table seg_test( x int primary key, y varchar2(20));

Table created.

dylan@DYLAN11> 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

dylan@DYLAN11> insert into seg_test values(1,'Dylan');

1 row created.

dylan@DYLAN11> commit;

Commit complete.

dylan@DYLAN11> 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
------------------------------ -----------      ------------       ---------- ---------- ----------
DYLAN                                    4                   57858             65536          8          1