Its entirely harmless (though obviously requires sysdba connection) the idea
is purely to look at the one row, one column table dual whilst the database
is not mounted You could equally unmount the database. curiosity won't kill
you in this case - the reason for saying doing this on prod would be silly
is that justifying downtime because ' I wanted to see what dual looks like
before mounting the controlfile' is.
--
Niall Litchfield
Oracle DBA
Audit Commission UK
"Thomas T" <T_at_T> wrote in message news:3e933fe2$1_at_rutgers.edu...
> "Niall Litchfield" <niall.litchfield_at_dial.pipex.com> wrote in message
> news:3e9094b9$0$21991$cc9e4d1f_at_news.dial.pipex.com...
> > "Hans Forbrich" <forbrich_at_telusplanet.net> wrote in message
> > news:3E8FCE58.DA81CCE1_at_telusplanet.net...
> > > Thomas T wrote:
> > >
> > > > How acceptable are one row, one column tables? I've heard of people
> > storing
> > > > multiple system variables in two-column, multi-row tables, with
column
> > names
> > > > such as "parameter_name" and "parameter_value". But is using a one
> > row/one
> > > > column table common? Or is it a way that works, but of bad design
> (like
> > > > creating multiple public rollback segments in the System
tablespace)?
> > >
> > > A 1-row, 1-column table is not a bad thing. It tends to look silly,
and
> > many
> > > purists will argue against it. But, remember the most famous table of
> all
> > > "DUAL"!
> >
> > I won't argue against it, it depends on the design. However if bringing
> dual
> > into the conversation be aware of the following (in a play area not a
> > production system that wuld be silly)
> >
> > sqlplus /nolog
> > shutdown
> > startup nomount
> > select * from dual;
> >
> >
> >
> > --
> > Niall Litchfield
> > Oracle DBA
> > Audit Commission UK
> > *****************************************
> > Please include version and platform
> > and SQL where applicable
> > It makes life easier and increases the
> > likelihood of a good answer
> > ******************************************
>
> Niall, what exactly happens with that statement? From seeing it, it looks
> like it would enter an infinite loop... but why the startup nomount? Does
> the database try to destroy itself? I can't bring myself to try that on
my
> test server!
>
> The situation does parallel itself nicely to my question, however. I
could
> see myself forgetting, and typing "select * from myOneRowTable"!
>
> -Thomas
>
>
Received on Wed Apr 09 2003 - 03:05:29 CDT
