Anna Li wrote:
>
> Hi,
>
> I created a unique index on a table called REGISTRATION_K, but no unique
> constraint. Last week when the application tried to insert a record into
> the table, we got following error in the log file:
>
> Oracle::st execute failed: ORA-00001: unique constraint (REGISTRATION_K)
> violated
>
> However, the record was inserted into the table successfully. There are no
> duplicate records in the table. Could anyone explain why?
>
> Any input will be highly appreciated. Thanks in advance.
>
> Anna
>
Anna,
- For both historical and implementation reasons, there is a bit of
confusion between unique indexes and unique constraint. ORA-00001
(notice the low number ... it has been here since the beginnings) used
to be the 'duplicate value in index' error (when constraints were a
notion unknown of Oracle). A unique constraint is enforced by a unique
index, and by force a unique index creates an implicit unique
constraint.
- You are misinterpreting. The record was NOT inserted successfully. It
wasn't inserted at all. What you found in the table was the original
row, which caused the redundant insertion fo fail.
--
Regards,
Stephane Faroult
Oriole Software
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Author: Stephane Faroult
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Received on Mon Jul 07 2003 - 16:35:37 CDT
