Re: Re: cardinality in query plans?
- From: "Juan Cachito Reyes Pacheco" <jreyes@xxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 16 Mar 2004 11:51:01 -0400
As I said pr eviously we had a problem, we fixed using NO_MERGE hint,
The reason was the new view complexity in 9i
now if you can't still solve your problem, I suggest you to set that
parameter, and try.
searching hidden parameters I found the name
select
ksppinm,
ksppstvl
from
x$ksppi a,
x$ksppsv b
where
a.indx=b.indx and
substr(ksppinm,1,1) = '_';
try setting _complex_view_merging=FALSE
Any way some body please knows where to do a search in this list?
----- Original Message -----
From: <ryan.gaffuri@xxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>; <oracle-l@xxxxxxxxxxxxx>
Sent: Tuesday, March 16, 2004 11:38 AM
Subject: Re: Re: cardinality in query plans?
> we are not using views.
> >
> > From: "Juan Cachito Reyes Pacheco" <jreyes@xxxxxxxxxxxxxxxx>
> > Date: 2004/03/16 Tue AM 10:24:20 EST
> > To: <oracle-l@xxxxxxxxxxxxx>
> > Subject: Re: cardinality in query plans?
> >
> > Hi, you are using views
> > there is a hidden parameter to disable new cbo feature for view
complexity,
> > I think this will solve your problem, but I don't remember the name.
> > ----- Original Message -----
> > From: <ryan.gaffuri@xxxxxxx>
> > To: <oracle-l@xxxxxxxxxxxxx>
> > Sent: Monday, March 15, 2004 9:50 AM
> > Subject: cardinality in query plans?
> >
> >
> > > I'm doing a two table join and both tables are analyzed. Oracle is
> > incorrectly choosing a full tables scan over an index search(I tested
it,
> > index search has 1/4 the logical I/Os).
> > >
> > > When I see the cardinality for the full tablescan I see 262,000.
However,
> > when I do a count(*) of the table or check num_rows in dba_tables I see
> > 870,000 records. I'm assuming this is why Oracle is choosing the full
table
> > scan.
> > >
> > > table is analyzed as follows:
> > >
> > > exec dbms_stats.gather_table_stats(cascade=>true).
> > >
> > > this interesting part is that when I use bind variables Oracle chooses
the
> > proper plan. Any ideas?
> > >
> > > ----------------------------------------------------------------
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > > ----------------------------------------------------------------
> > > To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
> > > put 'unsubscribe' in the subject line.
> > > --
> > > Archives are at //www.freelists.org/archives/oracle-l/
> > > FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
> > > -----------------------------------------------------------------
> > >
> >
> >
> > ----------------------------------------------------------------
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > ----------------------------------------------------------------
> > To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
> > put 'unsubscribe' in the subject line.
> > --
> > Archives are at //www.freelists.org/archives/oracle-l/
> > FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
> > -----------------------------------------------------------------
> >
>
> ----------------------------------------------------------------
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> ----------------------------------------------------------------
> To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
> put 'unsubscribe' in the subject line.
> --
> Archives are at //www.freelists.org/archives/oracle-l/
> FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
> -----------------------------------------------------------------
>
----------------------------------------------------------------
Please see the official ORACLE-L FAQ: http://www.orafaq.com
----------------------------------------------------------------
To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx
put 'unsubscribe' in the subject line.
--
Archives are at //www.freelists.org/archives/oracle-l/
FAQ is at //www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------
Other related posts:
