Questions about NOVALIDATE ALLOW a constraint

I have run the command on Oracle 11.2.0.1 on Redhat 5.2

SQL> alter table agency add constraint agency_agcy_ori unique (agcy_ori) ENABLE NOVALIDATE;
alter table agency add constraint agency_agcy_ori unique (agcy_ori) ENABLE NOVALIDATE
                                  *
ERROR at line 1:
ORA-02299: cannot validate (DEVPF.AGENCY_AGCY_ORI) - duplicate keys found

I knew that the table has two copies and null in the column in which I want to add a unique constraint. Using NOVALIDATE, I expected tolarates exist it in double and valid new data added to the uniqueness. Because it says in Oracle DOc B28286 (page 8-15)

ENABLE NOVALIDATE ensures that all new DML operations on the constrained
data comply with the constraint. This clause does not ensure that existing data in
the table complies with the constraint

However, my database is inconsistent with that. I misunderstood the doc?

Other related issues
(1) I have two rows with the agcy_ori column is NULL. Who would consider duplicate and fails to VALIDATE when create a unique constraint.
(2) the same doc shows also (page 8-16)

DISABLE VALIDATE disables the constraint and drops the index on the constraint,
but keeps the constraint valid. This feature is most useful in data warehousing
situations, because it lets you load large amounts of data while also saving space
by not having an index. This setting lets you load data from a nonpartitioned table
into a partitioned table using the exchange_partition_clause of the ALTER
TABLE statement or using SQL*Loader. All other modifications to the table
(inserts, updates, and deletes) by other SQL statements are disallowed

This raises more questions:
(a) turn OFF VALIDATE a unique constraint drop the unique index but always validate uniqueness. That is to say than the uniqueness of remained you without a unique index. If it is possible, why ALLOW a unique constraint need create a unique index?
(b) the last setense "all changes to the table by the other SQL statements are not allowed. This makes the table read only with the exception of partition/nonpartition and SQL * LOADER. This can be a useful feature, but I don't see the logic here: cannot update Column2 of the table just because a constraint in column 10 is DISABLE VALIDATE.

Hope that people can help me here. Thank you.

It won't work if you create a non-unique index for the constraint.

SQL> create table test (nn number);
Table created.
SQL> create index te on test (nn) ;
Index created.
SQL> insert into test values (1);
1 row created.
SQL> insert into test values (1);
1 row created.
SQL> alter table test add constraint ttt unique (nn) using index te enable novalidate;
Table altered.
SQL> select * from test;

        NN
----------
         1
         1

2 rows selected.

Tags: Database

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ORACLE-BASE - title

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-----------------

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