Does Oracle re-enable an already enabled constraint

Hi All,
If my constraints are already enabled and I issue the following enable command:
alter table <table_name> enable constraint <constraint_name>;
Will oracle re-enable this already enabled constraint - i.e go through the table data validating each column/columns(as teh case may be) againist the constraint rules, or it will simply do nothing since the constraint is ok?
Thanks.

At leats if they previsouly were enabled with novalidate Oracle WILL DEFINTELY CHECK THEM. Example:
Connected to Oracle Database 11g Release 11.2.0.1.0
Connected as gints
SQL> create table t(a number);
Table created
SQL> insert into t values (null);
1 row inserted
SQL> alter table t add constraint a_nn check(a IS NOT NULL) enable novalidate;
Table altered
SQL> alter table t enable constraint a_nn;
alter table t enable constraint a_nn
ORA-02293: cannot validate (GINTS.A_NN) - check constraint violated
SQL> Gints Plivna
http://www.gplivna.eu

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Problem in enabling constraint - after disabling and truncation of table .

Hello Friends,
I have a table called DRR_TABLES that has list of table names . The requirement is to truncate the tables present in DRR_TABLES except KEY_IDS table and table_name like '%TYPE%' table.
written a procedure . successfullly truncating the tables from DRR_TABLES but while enabling constraints after truncation , I am getting problem in enabling constraints .
ERROR at line 1:
ORA-02270: no matching unique or primary key for this column-list
ORA-06512: at "schema123.TRUNCATE_DRR_TABLES ", line 49
ORA-06512: at line 1
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x varchar2(200);
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Edited by: kumar73 on 3 Sep, 2012 11:44 PM

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<font face="Times New Roman" size=2>
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</font>
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OS :
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Stuck at "about to enable constraints..."

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Hi all,
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969224 wrote:
Just curious, does any one know how long it would take for enabling one disabled constraint on a 166gb table? The table has 34 columns and 2 primary keys.
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Edited by: Ishan on May 12, 2012 3:54 PM

>
Hi,
1) Is there any time difference between enabling constraint on a Non-partitioned table and
enabling constraint on a partitioned table, both tables having same no. of records? http://docs.oracle.com/cd/B10501_01/server.920/a96521/partiti.htm
=====================
Partitions and subpartitions of a table or index all share the same logical attributes. For example, all partitions (or subpartitions) in a table share the same column and constraint definitions, and all partitions (or subpartitions) of an index share the same index options. They can, however, have different physical attributes (such as TABLESPACE).
======================
2) Suppose, we have 3 tables A, B and C.
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enabling FK constraint for the second table? Is there some locking mechanism, which enables
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Googling "enable constraint partitioned table" and "constraint deferrable oracle partitioned table" gave several
interesting pages which may be of interest, but I don't know enough about your case to help further.
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Paul...
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Does Oracle re-enable an already enabled constraint

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