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Home -> Community -> Mailing Lists -> Oracle-L -> 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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Received on Thu Jun 08 2006 - 13:05:47 CDT
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