Re: order by / sorting performance issue

A proper locally managed temporary tablespace would be a start. Formed from many datafiles on many hard disks would be better. RAID 0 would be better still.

And nothing, but nothing else, on the same hard drives.

Whaddayagot?

Regards
HJR "James" <thanatic_at_telstra.com> wrote in message news:7377f06c.0207290341.53008811_at_posting.google.com...
> Hello world,
>
> James here.
>
> Has anyone got any tips in sorting a wide table?
> I am very dissatisfied with the present performance and I am looking
> for some answers.
>
> The base table is only about 40000 records and a where clause drives
> it down to 6000. An unsorted qry returns the result very quickly but
> an order by (on an unindexed varchar2) is very slow.
>
> Now I have added a constraint to this field of "not null" and I have
> indexed it hoping that the sort operation is not required. But the
> explain plan still says that it is.
>
> I tried to provide a hint but this didn't seem to work either.
>
> Is this the way to go in improving my performance? Maybe I have simply
> stuffed up the hint and I should persevere with this idea.
>
> Any ideas about speeding up sorts?
>
> Regards,
> James Crockart
> Carsales.com.au
Received on Mon Jul 29 2002 - 07:34:53 CDT