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IDS Forum

Re: AW: implicit PK

Posted By: rroussey@comcast.net
Date: Tuesday, 9 March 2010, at 10:11 a.m.

In Response To: AW: implicit PK (Andreas.KUTSCHE@spar.at)

You could use Art's magical 'myschema' which will create the schema with separate files for creating tables and another one for creating all indices. Available at www.iiug.org tools. An awk script could then piece together whatever you want.

Bob

----- Original Message -----
From: "Andreas.KUTSCHE@spar.at" <andreas.kutsche@spar.at>
To: ids@iiug.org
Sent: Tuesday, March 9, 2010 7:57:09 AM GMT -05:00 US/Canada Eastern
Subject: AW: implicit PK [19281]

Hi,

as already mentioned you must take care not to loose schema objects (e.g.
foreign keys) and you probably will need an application downtime (e.g to avoid
duplicates after dropping the old primary key).

Another possible problem: It might take a very long time to drop an attached
index (implicit primary key). Sometimes it is faster to copy the table and
create the primary key afterwards.

Regards,
Andreas Kutsche

>
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-----Ursprngliche Nachricht-----

> Von: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Im Auftrag von
> Fernando Nunes
> Gesendet: Dienstag, 9. Mrz 2010 12:45
> An: ids@iiug.org
> Betreff: Re: implicit PK [19279]
>
> That will be VERY hard to do...
> You'd need to recreate all the indexes. But that will drop the foreign
> keys
> that reference the table.
> So you'd have to gather all foreign keys, drop all primary keys, recreate
> all primary keys, recreate all foreign keys....
> And make sure nobody touches the database.
>
> Do you really to do that in your database? Or do you just need a schema
> script with the changes you mention?
>
> Regards.
>
> On Tue, Mar 9, 2010 at 10:40 AM, ALBERTO ROMEU PESSONIO FILHO <
> arfilho@orizonbrasil.com.br> wrote:
>
> > Hi guys!
> >
> > Does anybody know how can I do to change an implicit PK to an explicit
> PK
> > for
> > all tables in a database automatically? I have several databases (about
> 50)
> > that uses implicit PK on the tables and I need to detach them using a
> SQL
> > script or a SPL for all tables in database.
> >
> > Example:
> >
> > create table "informix".tbgrupoexcecao
> > (
> >
> > ems_numero integer not null ,
> >
> > pri_grupo smallint,
> >
> > primary key (pri_grupo)
> > );
> >
> > I need to change to this;
> >
> > create table "informix".tbgrupoexcecao
> > (
> >
> > ems_numero integer not null ,
> >
> > pri_grupo smallint
> > );
> >
> > create unique index ix_01 on "informix".tbgrupoexcecao
> > (pri_grupo) using btree in dbspace_x;
> >
> > I appreciate any help.
> > Thanks in advance,
> > Alberto.
> >
> >
> >
> >
> **************************************************************************
> *****
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --
> Fernando Nunes
> Portugal
>
> http://informix-technology.blogspot.com
> My email works... but I don't check it frequently...
>
> --0016e6d64c238b9ffb04815cb514
>
>

Messages In This Thread

  • implicit PK
    ALBERTO ROMEU PESSONIO FILHO -- Tuesday, 9 March 2010, at 5:40 a.m.
    • Re: implicit PK
      Fernando Nunes -- Tuesday, 9 March 2010, at 6:44 a.m.
      • AW: implicit PK
        Andreas.KUTSCHE@spar.at -- Tuesday, 9 March 2010, at 7:57 a.m.
        • Re: AW: implicit PK
          rroussey@comcast.net -- Tuesday, 9 March 2010, at 10:11 a.m.
    • Re: implicit PK
      Art Kagel -- Tuesday, 9 March 2010, at 5:30 p.m.

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