Re: Query Analyzing

On Mon, 8 Jul 2002 11:16:34 -0700, "Booth, Robert"
 wrote:
>[about performance problems with a query containing two inner and
> eight outer joins]
Rob,

sorry for being quiet for so long, the printout of your mail got lost
in a pile of paper.

It wouldn`t have helped much, however, if I responded earlier.  I
could not find a hot spot in your query,  you are losing time
constantly,  not much with each outer join,  but it sums up.
Rewording your SQL won't help, AFAICS.

I thought of converting the outer joins to inner joins (you would have
to provide default entries in your lookup tables), writing the joins
in this form:
	FROM a, b, c ... WHERE a.b_id=b.id AND a.c_id=c.id ...
and letting the optimizer do its work, but I fear that you would again
end up with lots of hash joins.

Maybe caching the lookup tables in the frontend might help?

Servus
 Manfred