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

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