Re: Many tables in a view.

Hi Eric,

The outer joins can not be removed in this case so that idea is out (Unfortunately)
I have tried the rule hint but performance doesn't get any better. The main problem is that it needs huge amounts of block gets and I can't seem to get it down. My advice was indeed to split the view into several smaller ones, but apparantly that's a no...no.. since it's so close to go live. So I'll wait what the Oracle Tuning expert has to say about it.

Jack

"Eric Lansu" <eric.lansu_at_quicknet.nl>@fatcity.com on 05/23/2000 11:36:26 AM

Please respond to ORACLE-L_at_fatcity.com

Sent by: root_at_fatcity.com

To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> cc:
Subject: Re: Many tables in a view.

Try removing the outer-joins. I know the results aren't what they should be, but at least you can find out if that's the problem. Next, try the hint for Rule-based optimizer, and watch the difference in the explain.
Last of my suggestions; Break this view into some different views. Maybe sometimes not all fields need to be retrieved. If you can save some joins, it may relieve the database a bit?

Eric Lansu

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, 23 May 2000 10:53

>
>
>
> Hi All,
>
>
> Just to give you some additional info:
>
> This is one of the views they came up with and doesn't perform very well.
>
> The second view is from the where clause of the first

--
Author: Eric Lansu
  INET: eric.lansu_at_quicknet.nl

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).





===================================================================
De informatie verzonden met dit E-mail bericht is uitsluitend bestemd voor
de geadresseerde. Gebruik van deze informatie door anderen dan de
geadresseerde is verboden. Openbaarmaking, vermenigvuldiging, verspreiding
en/of verstrekking van deze informatie aan derden is niet toegestaan.
Ernst & Young staat niet in voor de juiste en volledige overbrenging van de
inhoud van een verzonden E-mail, noch voor tijdige ontvangst daarvan.
===================================================================
The information contained in this communication is confidential and may be
legally privileged. It is intended solely for the use of the individual or
entity to whom it is addressed and others authorised to receive it. If you
are not the intended recipient you are hereby notified that any disclosure,
copying,  distribution or taking any action in reliance on the contents of
this information is strictly prohibited and may be unlawful. Ernst &
Young is neither liable  for the proper and complete transmission of the
information contained in this communication nor for any delay in its