Distinguish between the different forms of constraint connected index

I create two similar tables

create table t_demo1 (id1 number(10));
create table t_demo2 (id2 number(10));

On the first table I first create a unique index with nologging option and then I created a primary key constraint, that uses this index

create unique index pk_demo1 on t_demo1(id1) nologging;
alter table t_demo1 add constraint pk_demo1 primary key (id1) using index;

On the second table I first create a primary key constraint and then I change the implicit index created in nologging mode

alter table t_demo2 add constraint pk_demo2 primary key (id2);
alter index pk_demo2 nologging;

In the data dictionary tables, indexes and constraints are very similar. For example, the following queries:

alter session set nls_date_format = 'dd.mm.yyyy hh24:mi:ss';

select  
  substr(object_name,1,15) object_name, 
  object_type, 
  created, 
  last_ddl_time
from user_objects
where object_name like '%DEMO%';

OBJECT_NAME     OBJECT_TYPE     CREATED             LAST_DDL_TIME
--------------- --------------- ------------------- -------------------
PK_DEMO1        INDEX           11.04.2011 12:23:55 11.04.2011 12:23:55
PK_DEMO2        INDEX           11.04.2011 12:23:55 11.04.2011 12:23:55
T_DEMO1         TABLE           11.04.2011 12:23:55 11.04.2011 12:23:55
T_DEMO2         TABLE           11.04.2011 12:23:55 11.04.2011 12:23:55

select 
  index_name,
  table_name,
  uniqueness,
  tablespace_name,
  logging
from user_indexes where index_name like '%DEMO%';

INDEX_NAME               TABLE_NAME               UNIQUENES TABLESPACE_NAME          LOG
------------------------ ------------------------ --------- ------------------------ ---
PK_DEMO1                 T_DEMO1                  UNIQUE    USERS                    NO
PK_DEMO2                 T_DEMO2                  UNIQUE    USERS                    NO

select 
     owner, 
     constraint_name, 
     constraint_type, 
     index_owner, 
     index_name
from sys.dba_constraints
where constraint_name like '%DEMO%';

OWNER                 CONSTRAINT_NAME         C INDEX_OWNER                  INDEX_NAME
--------------------- ----------------------- ------------------------------ ------------------------------
SCOTT                 PK_DEMO1                P SCOTT                        PK_DEMO1
SCOTT                 PK_DEMO2                P SCOTT                        PK_DEMO2

But they behave different. When I disable and enable the constraint the second index fell and created again, as it can be seen in the next hour of creation. And this index loses its setting nologging after deactivation and activation of the constraint. However, the first index remains unchanged by this change in the constraint:

alter table t_demo1 modify constraint pk_demo1 disable;
alter table t_demo2 modify constraint pk_demo2 disable;

alter table t_demo1 modify constraint pk_demo1 enable;
alter table t_demo2 modify constraint pk_demo2 enable;

select  
  substr(object_name,1,15) object_name, 
  object_type, 
  created, 
  last_ddl_time
from user_objects
where object_name like '%DEMO%';

OBJECT_NAME     OBJECT_TYPE         CREATED             LAST_DDL_TIME
--------------- ------------------- ------------------- -------------------
PK_DEMO1        INDEX               11.04.2011 12:23:55 11.04.2011 12:23:55
PK_DEMO2        INDEX               11.04.2011 12:30:30 11.04.2011 12:30:30
T_DEMO1         TABLE               11.04.2011 12:23:55 11.04.2011 12:30:29
T_DEMO2         TABLE               11.04.2011 12:23:55 11.04.2011 12:30:29

select 
  index_name,
  table_name,
  uniqueness,
  tablespace_name,
  logging
from user_indexes where index_name like '%DEMO%';

INDEX_NAME                     TABLE_NAME                     UNIQUENES TABLESPACE_NAME                LOG
------------------------------ ------------------------------ --------- ------------------------------ ---
PK_DEMO1                       T_DEMO1                        UNIQUE    USERS                          NO
PK_DEMO2                       T_DEMO2                        UNIQUE    USERS                          YES

I checked it on a database of 10.2 and 11.1. The behaviuor is the same. My main question is, where can I find information in the dictionary of data in which of the two ways a constraint and an index conencted where created without deactivation and activation of the constraint.

Published by: user1775992 on 22.11.2011 03:32

Getting back to the original question for a moment, that I remember trying to find it earlier.

I don't know if she is exposed through a decent data dictionary view anywhere, I certainly have to find one at the time, however I came to the conclusion this implicit attribute of create/remove an index has been revealed by the ILO 13th column of PROPERTY in SYS. IND$

Using your two tables to test above for example, I get this:

SQL> conn / as sysdba
Connected.
SQL> select object_name,object_id from dba_objects
  2   where owner='SCOTT' and object_name like 'PK_DEMO%'
  3   order by 1;

OBJECT_NAME OBJECT_ID
----------- ---------
PK_DEMO1        13333
PK_DEMO2        13334

SQL> select obj#, property from ind$
  2   where obj# in (13333,13334)
  3   order by 1;

      OBJ#   PROPERTY
---------- ----------
     13333          1
     13334       4097

so, for PK_DEMO2, I interpret 4097 = 1 + 4096 to indicate 'unique' + 'implicitly created.

Tags: Database

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Reference table1.jpg

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Reference table2.jpg

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Reference table3.jpg

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