RE: Creating sequences on the DUAL table?

answer below

> -----Original Message-----
> From: Cherie_Machler_at_gelco.com [mailto:Cherie_Machler_at_gelco.com]
>
> I have a request from one of our developers to create two new
> sequences on
> the DUAL table.
>
> This seems like a bad idea to me. I've never had such a
> request in the
> past. I asked for clarification on why this is needed and I
> didn't get a
> lot of details yet.
>
> Is this something that is standard operating procedure? My
> understanding
> that interfacing with the DUAL table is usually inviting poor
> performance.
> Plus, I don't like to mess around with system tables, in general.
>
> Under what circumstances would it be justified to create
> sequences on the
> DUAL table? Should I just flat-out refuse this request and
> if so, why?

You don't mean that the developer wants to add columns to dual? I think the developer means that you should create two sequences, and he will get the next value by saying
select seq.nextval from dual ;
(example:
SQL> create sequence s ;
Séquence créée.
SQL> select s.nextval from dual ;

  NEXTVAL

        1
end of example)
I don't see a problem with creating a sequence for someone, as long as you make them beg properly first to teach them respect for the importance of the DBA.

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