原文： http://space.itpub.net/40239/viewspace-365948

?

OMF和非OMF管理的數(shù)據(jù)文件在DROP TABLESPACE時(shí)是否會(huì)自動(dòng)刪除，做了測(cè)試：

SQL> alter system set db_create_file_dest='/oradata/data/standby' scope=both;

System altered.

?

SQL> show parameter db_create

NAME???????????????????????????????? TYPE??????? VALUE
------------------------------------ ----------- ------------------------------
db_create_file_dest????????????????? string????? /oradata/data/standby
db_create_online_log_dest_1????????? string
db_create_online_log_dest_2????????? string
db_create_online_log_dest_3????????? string
db_create_online_log_dest_4????????? string
db_create_online_log_dest_5????????? string

SQL> create tablespace t3 datafile size 10m;

Tablespace created.

SQL> select * from v$tablespace;

?????? TS# NAME?????????????????????????? INC
---------- ------------------------------ ---
???????? 0 SYSTEM???????????????????????? YES
???????? 1 UNDOTBS1?????????????????????? YES
???????? 2 TEMP?????????????????????????? YES
???????? 3 INDX?????????????????????????? YES
???????? 4 USR??????????????????????????? YES
???????? 5 KONG?????????????????????????? YES
???????? 6 TEST?????????????????????????? YES
???????? 9 T1???????????????????????????? YES
???????? 8 LOGMNRTS?????????????????????? YES
??????? 10 T2???????????????????????????? YES
??????? 11 T3???????????????????????????? YES

11 rows selected.

SQL> select name from v$datafile??where ts# = 11;

NAME
--------------------------------------------------------------------------------
/oradata/data/standby/o1_mf_t3_464smo7s_.dbf

?

SQL> create table t100 (id int) tablespace t3;

Table created.

SQL> drop tablespace t3;
drop tablespace t3
*
ERROR at line 1:
ORA-01549: tablespace not empty, use INCLUDING CONTENTS option

SQL> drop tablespace t3 including contents?;

Tablespace dropped.

SQL> !ls -l /oradata/data/standby/o1_mf_t3_464smo7s_.dbf
ls: 0653-341 The file /oradata/data/standby/o1_mf_t3_464smo7s_.dbf does not exist.

看到在DROP TABLESPACE時(shí)，就算沒(méi)有加上 and datafiles是選項(xiàng)， ORACLE 也會(huì)自動(dòng)刪除數(shù)據(jù)文件；

?

?

SQL> create tablespace t3 datafile '/oradata/data/standby/data/t3.dbf' size 10m;

Tablespace created.

SQL> create table t100 (a int) tablespace t3;

Table created.

SQL> drop tablespace t3 ;
drop tablespace t3
*
ERROR at line 1:
ORA-01549: tablespace not empty, use INCLUDING CONTENTS option

SQL> drop tablespace t3? including contents;

Tablespace dropped.

SQL> !ls -l /oradata/data/standby/data/t3.dbf
-rw-r-----?? 1 oracle?? dba??????? 10493952 Jun 25 23:42 /oradata/data/standby/data/t3.dbf

沒(méi)有加上and datafiles參數(shù)時(shí)，oracle不會(huì)自動(dòng)刪除datafiles。

?

SQL> create tablespace t3 datafile '/oradata/data/standby/data/t4.dbf' size 10m;

Tablespace created.

SQL> create table t100 (a int) tablespace t3;

Table created.

SQL> drop tablespace t3? including contents and datafiles;

Tablespace dropped.

SQL> !ls -l /oradata/data/standby/data/t4.dbf
ls: 0653-341 The file /oradata/data/standby/data/t4.dbf does not exist.

加上and datafiles參數(shù)時(shí)，oracle會(huì)自動(dòng)刪除datafiles。

?

?

SQL> alter system set db_create_file_dest='' scope=both;

System altered.

SQL> create tablespace t3 datafile '/oradata/data/standby/data/t4.dbf' size 10m;

Tablespace created.

SQL> create table t100 (a int) tablespace t3;

Table created.

SQL> drop tablespace t3? including contents and datafiles;

Tablespace dropped.

SQL> !ls -l /oradata/data/standby/data/t4.dbf
ls: 0653-341 The file /oradata/data/standby/data/t4.dbf does not exist.

SQL>

?

===============================================

SQL code：

--刪除空的表空間，但是不包含物理文件
drop tablespace tablespace_name;

--刪除非空表空間，但是不包含物理文件
drop tablespace tablespace_name including contents;

--刪除空表空間，包含物理文件
drop tablespace tablespace_name including datafiles;

--刪除非空表空間，包含物理文件
drop tablespace tablespace_name including contents and datafiles;

--如果其他表空間中的表有外鍵等約束關(guān)聯(lián)到了本表空間中的表的字段，就要加上CASCADE CONSTRAINTS
drop tablespace tablespace_name including contents and datafiles CASCADE CONSTRAINTS;

?

轉(zhuǎn)：Oracle:刪除表空間