做一個 initial 小于uniform size的實驗,驗證 該表建立後:建立了minextents 個uniform size的extents.
相關知識參考連結:http://blog.csdn.net/msdnchina/article/details/43836411
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> alter system set deferred_segment_creation=false;
System altered.
SQL> show parameter defer
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
deferred_segment_creation boolean FALSE
SQL> create tablespace test_uni_sz_2m
2 datafile '/u01/app/oracle/oradata/test/test_uni_sz_2m_01.dbf' size 50m
3 extent management local uniform size 2m;
Tablespace created.
SQL> create table test_tab_2 (col1 varchar2(2)) tablespace test_uni_sz_2m storage(initial 65535 minextents 3);
Table created.
SQL> select bytes from dba_extents where segment_name = 'TEST_TAB_2' and owner = 'SCOTT';
BYTES
----------
2097152
2097152
2097152
SQL> show user
USER is "SCOTT"
SQL>