ORA-02266: unique/primary keys in table referenced by enabled foreign keys

在数据库里面使用TRUNCATE命令截断一个表的数据时,遇到如下错误

SQL >TRUNCATE TABLE ESCMOWNER.SUBX_ITEM

ORA-02266: unique/primary keys in table referenced by enabled foreign keys

有时候对应的中文错误提示为:ORA-02266: 表中的唯一/主键被启用的外部关键字引用,一般出现这个错误,是因为表中的主键被其它表的外键所引用,导致删除数据时出错。


此时,你可以通过下面脚本查看一下涉及该表主键的外键约束信息。

   1: select c1.table_name      as org_table_name,
   2:        c1.constraint_name as org_constraint_name,
   3:        c1.constraint_type as org_constriant_type,
   4:        n1.column_name     as org_colun_name,
   5:        c2.table_name      as ref_table_name,
   6:        c2.constraint_type as ref_constraint_type,
   7:        c2.constraint_name as ref_constraint_name,
   8:        n2.column_name     as ref_column_name
   9:   from dba_constraints  c1,
  10:        dba_constraints  c2,
  11:        dba_cons_columns n1,
  12:        dba_cons_columns n2
  13:  where c1.owner = 'OWNER_NAME'
  14:    and c1.table_name = 'TABLE_NAME'
  15:    and n1.constraint_name = c1.constraint_name
  16:    and n1.owner = c1.owner
  17:    and c2.constraint_type = 'R'
  18:    and c2.r_constraint_name = c1.constraint_name
  19:    and n2.owner = c2.owner
  20:    and n2.constraint_name = c2.constraint_name;

查询结果如下所示:

   1: SQL> select c1.table_name      as org_table_name,
   2:   2         c1.constraint_name as org_constraint_name,
   3:   3         c1.constraint_type as org_constriant_type,
   4:   4         n1.column_name     as org_colun_name,
   5:   5         c2.table_name      as ref_table_name,
   6:   6         c2.constraint_type as ref_constraint_type,
   7:   7         c2.constraint_name as ref_constraint_name,
   8:   8         n2.column_name     as ref_column_name
   9:   9    from dba_constraints  c1,
  10:  10         dba_constraints  c2,
  11:  11         dba_cons_columns n1,
  12:  12         dba_cons_columns n2
  13:  13   where c1.owner = 'ESCMOWNER'
  14:  14     and c1.table_name = 'SUBX_ITEM'
  15:  15     and n1.constraint_name = c1.constraint_name
  16:  16     and n1.owner = c1.owner
  17:  17     and c2.constraint_type = 'R'
  18:  18     and c2.r_constraint_name = c1.constraint_name
  19:  19     and n2.owner = c2.owner
  20:  20     and n2.constraint_name = c2.constraint_name;
  21:  
  22: ORG_TABLE_NAME   ORG_CONSTRAINT_NAME  ORG_CONSTRIANT_TYPE ORG_COLUN_NAME  REF_TABLE_NAME  REF_CONSTRAINT_TYPE REF_CONSTRAINT_NAME REF_COLUMN_NAME        
  23: --------------   ------------------- ------------------- ---------------- --------------  ------------------- ------------------- 
  24: SUBX_ITEM             PK_SUBX_ITEM           P               ITEM_ID         SUBX_DIMM            R                   FK_SUBX_DIMM                   ITEM_ID
  25:  
  26: SQL>

解决方法:先禁用表的主键约束,等截断后再启用

   1: SQL> ALTER TABLE ESCMOWNER.SUBX_ITEM DISABLE PRIMARY KEY CASCADE;
   2:  
   3:  
   4: SQL>TRUNCATE TABLE ESCMOWNER.SUBX_ITEM
   5:  
   6: SQL>ALTER TABLE ESCMOWNER.SUBX_ITEM ENABLE PRIMARY KEY;
   7:  
   8: SQL>ALTER TABLE ESCMOWNER.SUBX_DIMM ENABLE CONSTRAINT FK_SUBX_DIMM;
   9:  

注意事项在ENABLE主键后不会自动恢复外键(没有cascade选项),因此需要手工对引用该键的约束进行ENABLE。

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