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Re: Rebuilding Indexes...

From: Jared Still <jkstill_at_cybcon.com>
Date: Fri, 27 Dec 2002 09:59:00 -0800
Message-ID: <F001.005233F0.20021227095900@fatcity.com>

Yeah, it sure does, if the index is unique.

Try out this test:

drop table y;

create table y(y number);
create unique index ypkidx on y(y);
alter table y add constraint ypk primary key(y); alter table y drop primary key;

select table_name, index_name
from user_indexes
where index_name = 'YPKIDX'
/

drop table y;

create table y(y number);
create index ypkidx on y(y);
alter table y add constraint ypk primary key(y); alter table y drop primary key;

select table_name, index_name
from user_indexes
where index_name = 'YPKIDX'
/

Notice that the non unique index will still be available, as Jack has already pointed out.

Don't know why the behaviors are different.

Jared

On Friday 27 December 2002 08:14, Denny Koovakattu wrote:
> If you build a separate index to enforce the primary key, Oracle
> shouldn't drop it when you disable or drop the primary key.
>
> Regards,
> Denny
>
> Quoting Rachel Carmichael <wisernet100_at_yahoo.com>:
> > Here's a reason:
> >
> > have you ever tried to find the three duplicate rows in a 12 million
> > row table without using the primary key constraint? I've had to
> > disable
> > or drop the constraint in order to use the exceptions table. Once I do
> > that, even if I've built a separate index that enforces the primary
> > key
> > constraint, Oracle drops the index. So I HAVE to rebuild it. If I
> > allow
> > the index to be rebuilt when I re-enable the primary key constraint,
> > it
> > builds it in the default tablespace of the table owner, not where I
> > want it.
> >
> > if anyone has a better way to fix this problem, I'm more than happy to
> > hear it! It's a data warehouse and the third party app has a bug we
> > can't find and on occasion sqlloads (via direct path) duplicate rows
> >
> > Rachel
> >
> > --- Jared Still <jkstill_at_cybcon.com> wrote:
> > > Though I have published a script for determining indexes that
> > > need to be rebuilt, and then rebuilding them, I have to say that
> > > this is almost never necessary.
> > >
> > > Why are you rebuilding indexes? About the only reason for ever
> > > doing so is that the BLEVEL >= 5.
> > >
> > > goto asktom.oracle.com, and do a search on 'index rebuild'.
> > >
> > > Currently, the third article may be of interest.
> > >
> > > Jared
> > >
> > > On Thursday 26 December 2002 12:24, Richard Huntley wrote:
> > > > Anyone have any useful scripts for doing this?
> > > >
> > > > TIA,
> > > > Rich
> > >
> > > ----------------------------------------
> > > Content-Type: text/html; charset="iso-8859-1"; name="Attachment: 1"
> > > Content-Transfer-Encoding: 7bit
> > > Content-Description:
> > > ----------------------------------------
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > > --
> > > Author: Jared Still
> > > INET: jkstill_at_cybcon.com
> > >
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jared Still
  INET: jkstill_at_cybcon.com

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San Diego, California        -- Mailing list and web hosting services
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Received on Fri Dec 27 2002 - 11:59:00 CST

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