Babu,
issue this in your sqlplus session:
show parameter optim
and then this:
alter session set optimizer_mode=choose;
and then this:
select /*+ RULE */ count(1) from dba_extents;
and then this:
select count(1) from dba_extents;
and let us know what happens.
Rachel: we were running all_rows in our dwh and it was
slowing down dd access. not sure why, choose and
all_rows are kissing cousins. true, dd is supposed to
be rule and with no stats. Have heard of cases where
dbms_statistics analyzed the sys schema while doing a
analyze_database, which is one reason I stopped using
it. Might be the problem here? We will find out.
hth,
jack
- Janardhana Babu Donga <jbdonga_at_ucdavis.edu> wrote:
> I have recently changed the analyze script. Earliar
> it was
> dbms_utility.analyze_schema(...) statement, It is
> now changed to
> dbms_stats.gather_database_stats();
>
> Is this a problem?
>
> The response time for select count(*) from
> dba_extents is also 30 minutes.
> It is not specific to any table.
> Thanks,
> -- Babu
>
> -----Original Message-----
> [mailto:Rachel_Carmichael_at_Sonymusic.com]
> Sent: Thursday, May 09, 2002 11:36 AM
> To: Multiple recipients of list ORACLE-L
>
>
>
>
> that's interesting... since the data dictionary is
> NOT analyzed, setting
> optimizer_mode=choose would force the query against
> dba_extents to RULE
> which it
> what it is supposed to be doing anyway, Hm. The
> question now is, what is the
> optimizer_mode set to when the problem happens? Did
> any of the data
> dictionary
> tables get accidentally analyzed? And -- how many
> extents are in use in the
> database? Could it just be a symptom of missized
> tables and indexes so that
> the
> number of extents is way high?
>
> Although Oracle is *supposed* to allow unlimited
> extents, in practice
> anything
> higher than 4096 extents in an object (at least in
> 8i) tends to slow things
> down.
>
>
>
>
> |--------+----------------------->
> | | |
> | | |
> | | jack_silvey_at_y|
> | | ahoo.com |
> | | |
> | | 05/09/2002 |
> | | 02:18 PM |
> | | Please |
> | | respond to |
> | | ORACLE-L |
> | | |
> |--------+----------------------->
>
>
>----------------------------------------------------|
> |
> |
> | To: ORACLE-L_at_fatcity.com
> |
> | cc: (bcc: Rachel Carmichael)
> |
> | Subject: Re: DBA_EXTENTS problem
> |
>
>
>----------------------------------------------------|
>
>
>
>
> Babu,
>
> We had a similiar problem, and setting
> optimizer_mode
> = choose in our session solved it. Something to do
> with optimizer and DD access. Give that a try. I had
> the same problem with DBA_INDEXES and that fixed it.
>
> hth,
>
> Jack
>
>
> --- Janardhana Babu Donga <jbdonga_at_ucdavis.edu>
> wrote:
> > Dear List,
> >
> > When I query dba_extents , Iam getting response
> > after half an hour to 40
> > minutes, but when I query any other dictionary
> view
> > it is spontaneous.
> > Everything else is fine in the database and there
> > are no problems, except
> > the above problem. Iam not getting any clue how to
> > fix this. Iam thinking of
> > running catalog.sql and catproc.sql as a last
> > resort. Iam not sure it would
> > fix the problem. Please let me know if there is
> any
> > other way to fix this
> > problem.
> >
> > Thanks,
> > Babu
> >
> >
> > --
> > Please see the official ORACLE-L FAQ:
> > http://www.orafaq.com
> > --
> > Author: Janardhana Babu Donga
> > INET: jbdonga_at_ucdavis.edu
> >
> > Fat City Network Services -- (858) 538-5051
> FAX:
> > (858) 538-5051
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> >
>
> > To REMOVE yourself from this mailing list, send an
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> __________________________________________________
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>
> Fat City Network Services -- (858) 538-5051 FAX:
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> 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
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> also send the HELP command for other information
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> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: Janardhana Babu Donga
> INET: jbdonga_at_ucdavis.edu
>
>
=== message truncated ===
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Received on Thu May 09 2002 - 14:41:13 CDT
