Re: Question about Append hint in Insert
- From: Tim Johnston <tjohnston@xxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 21 Jun 2004 16:55:26 -0400
9i lets you do this as long as you use the keep index syntax... For 8i
your statement is correct... Modifying Jared's example...
SQL> drop table x;
Table dropped.
SQL>
SQL> create table x
2 as
3 select distinct object_name
4 from user_objects
5 /
Table created.
SQL>
SQL> create unique index x_idx on x(object_name)
2 /
Index created.
SQL>
SQL> alter table x add constraint x_pk
2 primary key(object_name)
3 using index x_idx
4 /
Table altered.
SQL>
SQL> select index_name , uniqueness, status
2 from user_indexes
3 where table_name = 'X'
4 /
INDEX_NAME UNIQUENES STATUS
------------------------------ --------- --------
X_IDX UNIQUE VALID
SQL>
SQL> select constraint_name, constraint_type, status
2 from user_constraints
3 where table_name = 'X'
4 /
CONSTRAINT_NAME C STATUS
------------------------------ - --------
X_PK P ENABLED
SQL>
SQL> alter table x drop primary key keep index;
Table altered.
SQL>
SQL> select index_name , uniqueness, status
2 from user_indexes
3 where table_name = 'X'
4 /
INDEX_NAME UNIQUENES STATUS
------------------------------ --------- --------
X_IDX UNIQUE VALID
SQL>
SQL> select constraint_name, constraint_type, status
2 from user_constraints
3 where table_name = 'X'
4 /
no rows selected
SQL>
Rachel Carmichael wrote:
>you may DROP the constraint without losing the index....
>
>if you drop a pk constraint, even if the unique index has been created
>separately, the index goes away too (this is from memory but I seem to
>recall spending a lot of time testing this ... and cursing)
>
>if the index is non-unique, dropping the constraint will not drop the
>index.
>
>can you try your test case several different ways (I'm swamped, don't
>have time to run this)
>
>1) same code, except drop the constraint not disable
>2) create a unique index before you create the constraint, then drop
>constraint (should still drop the index)
>3) create a non-unique index before you create the constraint, then
>drop constraint (should keep the index)
>
>and please, if I'm wrong, let the list know, not just me :)
>
>Rachel
>
>
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