I'm a little doubtful about the value of 'keep index'.
Consider the scenarios:
unique constraint, non-unique index:
- "keep index" redundant because its kept anyway
unique constraint, unique index:
- "keep index" redundant because effectively retains
the constraint anyway (because you still can't insert
dups)
So far, the only use for KEEP INDEX I've found is the
scenario where you:
- decided that column(s) X was the primary key
- created a unique index on it
- created a primary key constraint on it
- loaded the data
- decided actually X was NOT the primary key, just a
unique value
- decided that X could allow nulls as well
- dropped the primary kept, kept the index and then
added a unique constraint...
I would contend that this is a rare occurrence ?
Cheers
Connor
- Rachel Carmichael <wisernet100_at_yahoo.com> wrote:
> sigh. I need to find time to read ALL the docs.
> Yeah, that'll happen.
> If I can find a parallel universe where time runs at
> a different rate.
>
> Thanks, I'll test this out as well.
>
>
> --- Arup Nanda <arupnanda_at_hotmail.com> wrote:
> > In 9.2, you can keep the index by using the KEEP
> INDEX key words.
> >
> > ALTER TABLE XXX DROP CONSTRAINT PK_XXX KEEP INDEX
> >
> > This will keep the index but drop the constraint.
> Talk about having
> > your
> > cake and eating it too...;)
> >
> > HTH
> >
> > Arup
> > ----- Original Message -----
> > To: "Multiple recipients of list ORACLE-L"
> <ORACLE-L_at_fatcity.com>
> > Sent: Friday, December 27, 2002 4:39 PM
> >
> >
> > > it'll have to wait until Monday, I'm not at work
> until then. I'll
> > try
> > > it with a non-unique then
> > >
> > > Hey, if it works, it saves me tons of time, I
> learn something new
> > and I
> > > had fun developing the single SQL statement to
> rebuild the
> > constraint
> > > and index. Win-win
> > >
> > >
> > > Rachel
> > >
> > > --- Denny Koovakattu <groups_at_koovakattu.com>
> wrote:
> > > >
> > > >
> > > > I don't have access to 9.2.0.1 right now.
> But can you try
> > creating
> > > > a non-
> > > > unique index instead of the unique index. If
> you create a unique
> > > > index, it gets
> > > > dropped. That's the behavior on 8.1.x also.
> But if it's a
> > non-unique
> > > > index, it
> > > > shouldn't get dropped.
> > > >
> > > > Regards,
> > > > Denny
> > > >
> > > > Quoting Rachel Carmichael
> <wisernet100_at_yahoo.com>:
> > > >
> > > > > 9.2.0.1 Solaris, and yes, it does drop it
> > > > >
> > > > > I created a unique index in the primary key
> columns
> > > > > I created the primary key constraint without
> specifying an
> > index
> > > > > I checked that the index existed, it did
> > > > > I dropped the primary key constraint
> > > > > I checked that the index existed, it didn't
> > > > >
> > > > > try it.... I tried various combinations
> before posting this
> > note
> > > > >
> > > > >
> > > > > --- Denny Koovakattu <groups_at_koovakattu.com>
> 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
> > > > > > > >
> > > > > > > > Fat City Network Services --
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> > > > > > > INET: wisernet100_at_yahoo.com
> > > > > > >
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Connor McDonald
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Received on Sun Dec 29 2002 - 14:23:42 CST
