Re: Question about Append hint in Insert

From: Tim Johnston <tjohnston_at_quallaby.com>
Date: Mon, 21 Jun 2004 16:55:26 -0400
Message-ID: <40D74B3E.802@quallaby.com>

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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Received on Mon Jun 21 2004 - 15:51:20 CDT