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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Help with view, pushing predicate, and 9i
Just double checked. No luck w/ _complex_view_merging....
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Duret, Kathy
Sent: Thursday, June 24, 2004 5:38 PM
To: 'oracle-l_at_freelists.org'
Subject: RE: Help with view, pushing predicate, and 9i
_complex_view_merging
worked for us.....
Good luck,
Kathy
-----Original Message-----
From: Bobak, Mark [mailto:Mark.Bobak_at_il.proquest.com]
Sent: Thursday, June 24, 2004 4:13 PM
To: oracle-l_at_freelists.org
Subject: RE: Help with view, pushing predicate, and 9i
Tried both of those, no luck......
Also, discovered that if we take the sql before the 'UNION ALL' and =3D
create a view v1 and then take the sql from afte the 'UNION ALL' and =3D
create a view v2 and finally, create view v3 as select * from v1 union =
=3D
all select * from v2; then select * from v3 where doc_id =3D3D .... =
works =3D
correctly!
Seems to be something with the union all....
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Juan Carlos Reyes
Pacheco
Sent: Thursday, June 24, 2004 4:52 PM
To: oracle-l_at_freelists.org
Subject: Re: Help with view, pushing predicate, and 9i
Content-Type: Text/Plain;
charset=3D3D"iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Two ideas, try disablyg complex view, sugin the hidden parameter, try =
=3D
usi=3D3D
ng
/*+ NO_MERGE */ =3D3D0D
=3D3D0D
-------Original Message-------=3D3D0D
=3D3D0D
From: oracle-l_at_freelists.org=3D3D0D
Date: 06/24/04 16:37:05=3D3D0D
To: oracle-l_at_freelists.org=3D3D0D
Subject: Help with view, pushing predicate, and 9i=3D3D0D
=3D3D0D
Hi,=3D3D0D
=3D3D0D
We have a view which is usually accessed like:=3D3D0D
select * from vu_xan_comp_agrmt_single where doc_id =3D3D3D3D =3D
:some_doc_id;=3D3D0D
=3D3D0D
In 8i (8.1.7.4 on Solaris 8), the 'doc_id=3D3D3D3D ' predicate is pushed =
=3D
into=3D3D
=3D3D0D
the view, and it works fine.=3D3D0D
=3D3D0D
We are in the process of converting this app to 9i (9.2.0.5 on =3D
Solaris=3D3D0D
8), and in 9i, the predicate is not pushed. This results in a =
full=3D3D0D
table scan on a large table, and, abysmal performance.=3D3D0D
=3D3D0D
This should NOT be a case where the predicate can't be pushed, due =3D
to=3D3D0D
rownum or analytical or aggregate function, etc. It works in 8i, so =3D
why=3D3D0D
not in 9i? Is this an optimizer bug? (_push_join_union_view and=3D3D0D
_push_join_predicate are both TRUE.)=3D3D0D
=3D3D0D
Any thoughts or suggestions are welcome.=3D3D0D
=3D3D0D
Thanks,=3D3D0D
=3D3D0D
-Mark=3D3D0D
=3D3D0D
PS Here's the beastie:=3D3D0D
CREATE OR REPLACE FORCE VIEW ADDS.VU_XAN_COMP_AGRMT_SINGLE=3D3D0D
(DOC_ID, VLAD_ID, CPAG_TEXT, CPAG_TEXT_LENGTH, =3D
CPAG_DAY_EFFECTIVE,=3D3D3D20=3D3D0D
CPAG_CALC_DATE, CPAG_FORMAT_MASK)=3D3D0D
AS=3D3D3D20=3D3D0D
select /*+ index(cpag cpag_indx_pr02) */ distinct doc_id, 0 =3D
vlad_id,=3D3D0D
first_value(cpag_text) over (partition by doc_id=3D3D0D
order by cpag_day_effective desc) cpag_text,=3D3D0D
first_value(length(cpag_text)) over (partition by doc_id=3D3D0D
order by cpag_day_effective desc) =3D
cpag_text_length,=3D3D0D
order by cpag_day_effective desc) =
cpag_format_mask=3D3D0D
order by vlad_id,cpag_day_effective desc)=3D3D0D
cpag_text_length,=3D3D0D
order by vlad_id,cpag_day_effective desc) cpag_day_effective,=3D3D0D
first_value(cpag_calc_date) over (partition by doc_id,vlad_id=3D3D0D
order by vlad_id,cpag_day_effective desc) cpag_calc_date,=3D3D0D
first_value(cpag_format_mask) over (partition by doc_id,vlad_id=3D3D0D
order by vlad_id,cpag_day_effective desc)=3D3D0D
cpag_format_mask=3D3D0D
----------------------------------------------------------------=3D3D0DPlease see the official ORACLE-L FAQ: http://www.orafaq.com=3D3D0D
----------------------------------------------------------------=3D3D0DTo unsubscribe send email to: oracle-l-request_at_freelists.org=3D3D0D put 'unsubscribe' in the subject line.=3D3D0D --=3D3D0D
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