建立表空間時指定reuse屬性:

[email protected]>create tablespace lfn_01 datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 10m autoextend on extent management local segment space management auto;

Tablespace created.

[email protected]>create table lfn_01 tablespace lfn_01 as select * from scott.emp;

Table created.

 
[email protected]>select * from lfn_01;

     EMPNO ENAME      JOB              MGR HIREDATE            SAL       COMM     DEPTNO
---------- ---------- --------- ---------- ------------ ---------- ---------- ----------
      7369 SMITH      CLERK           7902 17-DEC-80           800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81          1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81          1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81          2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81          1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81          2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81          2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87          3000                    20
      7839 KING       PRESIDENT            17-NOV-81          5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81          1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87          1100                    20
      7900 JAMES      CLERK           7698 03-DEC-81           950                    30
      7902 FORD       ANALYST         7566 03-DEC-81          3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82          1300                    10

14 rows selected.

#增加一個數據檔案

 
[email protected]>alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_02.dbf' size 1M reuse;

Tablespace altered.


#對已經存在的資料檔案進行reuse.報錯
[email protected]>alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_02.dbf' size 2M reuse;
alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_02.dbf' size 2M reuse
*
ERROR at line 1:
ORA-01537: cannot add file '/u01/app/oracle/oradata/PROD/lfn_02.dbf' - file already part of
database


 
[email protected]>alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 2M reuse;
alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 2M reuse
*
ERROR at line 1:
ORA-01537: cannot add file '/u01/app/oracle/oradata/PROD/lfn_01.dbf' - file already part of
database

#表空間離線 看是否可以reuse

alter tablespace lfn_01 offline;

[email protected]>alter tablespace lfn_01 offline;

Tablespace altered.


[email protected]>alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 2M reuse;
alter tablespace lfn_01 add datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 2M reuse
*
ERROR at line 1:
ORA-01641: tablespace 'LFN_01' is not online - cannot add data file

#只有表空間時online的時候才可以新增資料檔案

[email protected]>alter tablespace lfn_01 online;

Tablespace altered.

#刪除表空間呢 刪除資料檔案的測試是沒有意義的.我們只刪除contents.
alter database drop tablespace lfn_01 including contents and datafiles;


[email protected]>drop tablespace lfn_01 including contents;

Tablespace dropped.

#繼續測試

[email protected]>create tablespace lfn_01 datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 10m autoextend on;
create tablespace lfn_01 datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 10m autoextend on
*
ERROR at line 1:
ORA-01119: error in creating database file '/u01/app/oracle/oradata/PROD/lfn_01.dbf'
ORA-27038: created file already exists
Additional information: 1

#報錯資料檔案存在,新增reuse
[email protected]>create tablespace lfn_01 datafile '/u01/app/oracle/oradata/PROD/lfn_01.dbf' size 10m reuse autoextend on;

Tablespace created.


reuse 重用指的是在新建表空間的時候重用以前被刪除的某個表空間下的資料檔案.