In case of object tables, the constraints are defined on the most primitive
of the objects. For instance, you have a table MYTAB defined on an object
type MYTYPE1 which references in MYTYPE2. An attribute of MYTYPE2, ATTR1 has
the constraint defined as not null. In this case the column_name in
dba_cons_columns will say "MYTAB"."MYTYPE1"."MYTYPE2" to show the hierarchy.
Since each of these values could be 30 chars long, with the dots and double
quotes, the column_name could easily be very long. Therefore,
VARCHAR2(4000).
HTH
Arup
>From: Rodd Holman <roddholman_at_hotpop.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: Re: this doesn't look right
>Date: Mon, 30 Dec 2002 14:53:56 -0800
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>This still begs the question why varchar(4000) in the underlying table
>if column names are only allowed to be 30? Is this table used for other
>objects that can have a longer name? If so what?
>
>Rodd
>
>On Mon, 2002-12-30 at 16:08, Shaleen wrote:
> > Varchar2(4000) is coming from sys.attrcol$ table. dba_tab_columns does
>not
> > have a join this table. I am sure there are people on this list who'll
> > enlighten me about contents of sys.attrcol$ table.
> >
> > select u.name, c.name, o.name,
> > decode(ac.name, null, col.name, ac.name), cc.pos#
> > from sys.user$ u, sys.con$ c, sys.col$ col, sys.ccol$ cc, sys.cdef$
> > cd,sys.obj$ o, sys.attrcol$ ac
> > where c.owner# = u.user#
> > and c.con# = cd.con#
> > and cd.type# != 12 /* don't include log groups */
> > and cd.con# = cc.con#
> > and cc.obj# = col.obj#
> > and cc.intcol# = col.intcol#
> > and cc.obj# = o.obj#
> > and col.obj# = ac.obj#(+)
> > and col.intcol# = ac.intcol#(+)
> >
> > -Shaleen
> > ----- Original Message -----
> > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > Sent: Monday, December 30, 2002 12:23 PM
> >
> >
> > > As part of the process of making sure that null/not null constraints
> > > are consistent across development/staging/production, I'm looking at
> > > the dba_cons_columns table.
> > >
> > > Now, as far as I know, column_names are limited to 30 characters,
> > > correct? If so, why is the column_name column in dba_cons_columns
> > > (9.2.0.1) a varchar2(4000)? I realize that the "extra space" isn't
>used
> > > and is never allocated so it's not like this is wasteful.
> > >
> > > But it's inconsistent with everything else, since dba_tab_columns has
>a
> > > column_name column of varchar2(30).
> > >
> > > anyone know why this is like this?
> > >
> > > Rachel
> > >
> > > __________________________________________________
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>Rodd Holman
>roddholman_at_hotpop.com
>
>Romans 1:16-17
>
>
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>Please see the official ORACLE-L FAQ: http://www.orafaq.net
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>Author: Rodd Holman
> INET: roddholman_at_hotpop.com
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Received on Mon Dec 30 2002 - 22:48:49 CST
