今天打算删除orcale数据库中无用的表空间，发现报错，查资料删除，写个过程留着备用。

1、drop tablespace dldata
INCLUDING CONTENTS CASCADE CONSTRAINTS;

报错如下：
ORA-00604: 递归 SQL 级别 1
出现错误
ORA-02429: 无法删除用于强制唯一/主键的索引

2、select
segment_name,partition_name,tablespace_name from dba_extents where
tablespace_name=upper('DLDATA');

显示有两个表：
SEGMENT_NAME                  
PARTITION_NAME                
TABLESPACE_NAME
-------------------- -------------------------
------------------------------
AAAA                                                         
DLDATA
AAAA                                                         
DLDATA

以下是生成删除主键约束的脚本
3、select 'alter table
'||owner||'.'||table_name||' drop constraint '||constraint_name||' ;' from
dba_constraints where constraint_type in ('U', 'P') and (index_owner,
index_name) in (select owner, segment_name from dba_segments where
tablespace_name =
'DLDATA');

显示如下：
'ALTERTABLE'||OWNER||'.'||TABL
--------------------------------------------------------------------------------
alter
table KJMN.EQINTERFACE drop constraint AAAA ;
alter table USERACC.EQINTERFACE
drop constraint AAAA ;

4、alter table KJMN.EQINTERFACE drop constraint
AAAA ;

结果如下：
Table altered

5、alter table USERACC.EQINTERFACE
drop constraint AAAA ;

结果如下：
Table altered

6、drop tablespace
DLDATA INCLUDING CONTENTS;

结果如下：
Tablespace dropped

摘自：http://blog.sina.com.cn/s/blog_497f02be0102v1mi.html