转：Oracle:删除表空间

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

OMF和非OMF管理的数据文件在DROP TABLESPACE时是否会自动删除，做了测试：

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时，就算没有加上 and datafiles是选项，ORACLE也会自动删除数据文件；

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

没有加上and datafiles参数时，oracle不会自动删除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参数时，oracle会自动删除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>

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SQL code：

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

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

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

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

--如果其他表空间中的表有外键等约束关联到了本表空间中的表的字段，就要加上CASCADE CONSTRAINTS
drop tablespace tablespace_name including contents and datafiles CASCADE CONSTRAINTS;