小编典典

无法验证,带有novalidate选项

sql

嗨,我正在插入一些日期做我的桌子。由于某些原因,我不得不禁用约束。约束与索引相关联。我使用了以下代码行:

ALTER TABLE my_table DISABLE CONSTRAINT "my_constraint" drop index

并且my_constraint处于禁用状态。不,我想启用此约束,但是在调用此行之后:

ALTER TABLE my_table ENABLE NOVALIDATE CONSTRAINT "my_constraint";\

我收到一个错误:

ORA-02299:无法验证(USER.my_constraint)-找到重复的密钥


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2021-03-10

共1个答案

小编典典

您不能具有带有唯一索引的非唯一值。但是,您可以具有带有由非唯一索引强制执行的唯一约束的非唯一值。即使您最初创建了一个非唯一索引,除非您在本节中提供了更多详细信息,否则drop indexandenable语法将尝试重新创建一个唯一索引using index

例如:

SQL> create table my_table(my_column number,
  2     constraint my_constraint unique (my_column));

Table created.

SQL> alter table my_table disable constraint my_constraint drop index;

Table altered.

SQL> insert into my_table select 1 from dual union all select 1 from dual;

2 rows created.

SQL> alter table my_table enable novalidate constraint my_constraint;
alter table my_table enable novalidate constraint my_constraint
*
ERROR at line 1:
ORA-02299: cannot validate (USER.MY_CONSTRAINT) - duplicate keys found


SQL> alter table my_table enable novalidate constraint my_constraint
  2     using index (create index my_index on my_table(my_column));

Table altered.

SQL> --The constraint is enforced, even though other rows violate it.
SQL> insert into my_table values(1);
insert into my_table values(1)
*
ERROR at line 1:
ORA-00001: unique constraint (USER.MY_CONSTRAINT) violated
2021-03-10