RE: disable pk works differently in oracle 9 and oracle 10?

I was wondering about that as well. I finally got my hands on metalink note #139666.1 (2003, 9i only). I am thinking 10g handles the association a little differently. Gene's case acts like Case 2 from the note, but I am not exactly sure why.

Interesting to note, as well, that the behavior changes a bit depending on how you define the PK in the first place. For all-around cleanliness and portability, it seems "nicer" to declare the constraint (and index) along with the table definition.

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From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Bobak, Mark Sent: Thursday, June 08, 2006 1:06 PM
To: genegurevich_at_discoverfinancial.com; oracle-l Subject: RE: disable pk works differently in oracle 9 and oracle 10?

Interesting.....

I never noticed that in 10g, but I do agree that what you observed in 9i is what I would consider expected behavior.

As I recall, (at least for 9i), if you disable a primary key and the underlying index is unique, it is dropped. If you disable a primary key and the underlying index is non-unique, it will remain.

Logically, I'm not sure if I agree w/ the 10g behavior. It would be possible to disable the PK constraint, and still be restricted from entering duplicate records, due to the existance of the unique index. I tested with unique constraint as well, and it behaves the same as PK (in 10g).

So, is it a bug or a feature? ;-)

-Mark

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Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled. --Richard P. Feynman, 1918-1988

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of genegurevich_at_discoverfinancial.com
Sent: Thursday, June 08, 2006 1:40 PM
To: oracle-l
Subject: disable pk works differently in oracle 9 and oracle 10?

Hi all:

I have noticed that something that I was able to do in oracle9 can't be done in oracle10. This is very annoying and I would appreciate any thoughts on this:

Oracle 9:

SQL> select * from v$version;
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production PL/SQL Release 9.2.0.4.0 - Production
CORE 9.2.0.3.0 Production
TNS for IBM/AIX RISC System/6000: Version 9.2.0.4.0 - Production NLSRTL Version 9.2.0.4.0 - Production

SQL> drop table test1;

Table dropped.

SQL> create table test1 (f1 number);

Table created.

SQL> create unique index test1_pk on test1 (f1);

Index created.

SQL> alter table test1 add constraint test1_pk primary key (f1) using index;

Table altered.

SQL> select index_name from dba_indexes where table_name = 'TEST1'; TEST1_PK SQL> alter table test1 disable primary key;

Table altered.

SQL> select index_name from dba_indexes where table_name = 'TEST1';

no rows selected

As you see when I disable the primary key, my index goes away as well. When I do the same in oracle 10G however things are different:

Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bi PL/SQL Release 10.2.0.2.0 - Production
CORE 10.2.0.2.0 Production
TNS for IBM/AIX RISC System/6000: Version 10.2.0.2.0 - Productio NLSRTL Version 10.2.0.2.0 - Production

5 rows selected.

SQL> drop table test1;
drop table test1

           *
ERROR at line 1:
ORA-00942: table or view does not exist

SQL> create table test1 (f1 number);

Table created.

SQL> create unique index test1_pk on test1 (f1);

Index created.

SQL> alter table test1 add constraint test1_pk primary key (f1) using index;

Table altered.

SQL> select index_name from dba_indexes where table_name = 'TEST1'; TEST1_PK SQL> alter table test1 disable primary key;

Table altered.

SQL> select index_name from dba_indexes where table_name = 'TEST1'; TEST1_PK Here the index stays after the PK is disabled.

This is a big difference IMO and I wonder whether this is a new feature in oracle10 or whether this is something I am not doing correctly. If anyone has any insight on that please let me know

thank you

Gene Gurevich
Oracle Engineering
224-405-4079

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http://www.freelists.org/webpage/oracle-l Received on Thu Jun 08 2006 - 13:25:58 CDT