Is there a way to distinguish constraint not null null, out-of-line one online?

Dear maters,

Could you please help me to answer the question: How can we distinguish non-null online constraints (non-null column option) not null out-of-line ones (constraints, defined at the table level)? Below is an example of what I mean.

  1. Create a table.
    CREATE TABLE TEST (ID NUMBER NOT NULL);

At this point, we have created a table with the constraint. The constraint was automatically created because of the option ' not null ' in the column definition. Say that the constraint name is SYS_C00699573. We can get the information about this user/all/dba_constraint or user/all/dba_cons_columns views.

  1. ALTER table.
    ALTER TABLE TEST ADD CHECK ('ID' IS NOT NULL).

Here, we have created the second constraint as well. Say his name is SYS_C00699574. The only difference between them is that the first is online, and the second constraint is not. Is not only the terminology: If you file online - the 'NOT NULL' option also expires the DDL of the table. This is serious: for example, optimizer Oracle does not the id as nullable column either. If you drop the second - nothing like that happens. Oracle therefore somehow difference between online and offline constraints.

  1. Drop out-of-line constraint. At this point the question arises: How can we distinguish who among the two constraints is online and who isn't? From dba_constraint/all/user or user/all/dba_cons_columns views constraints search exactly except their names.

Does anyone have an idea? Any help is very appreciated.

Thank you.

If you go here:

SELECT * FROM SYS. CDEF$ WHERE OBJ #= you_table_object_id

You can see the TYPE # is different, one is 7 (non-null) is 1 (check).

Tags: Database

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