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RE: DBA_EXTENTS problem

From: Janardhana Babu Donga <jbdonga_at_ucdavis.edu>
Date: Thu, 09 May 2002 12:18:58 -0800
Message-ID: <F001.0045D84F.20020509121858@fatcity.com>


I have just now deleted the 'SYS' schema statistics and executed select count(*) from dba_extents, and there is no improvement. It is still sitting there.

Thanks,
--Babu

-----Original Message-----
Sent: Thursday, May 09, 2002 12:45 PM
To: Multiple recipients of list ORACLE-L

dbms_stats.gather_database_stats has a bug, it analyzes SYS objects.

>From Metalink:

Bug:1422285 is a severity 3 bug that was logged for the dbms_stats.gather_database_stats collecting statistics on the data dictionary objects (FET$ was the example). This bug is fixed in 9i. A workaround is to execute dbms_stats.gather_database_statistics + dbms_stats.delete_schema_stats('SYS').

Janardhana Babu Donga 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
> >
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> Author: Janardhana Babu Donga
> INET: jbdonga_at_ucdavis.edu
>
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-- 
Author: Janardhana Babu Donga
  INET: jbdonga_at_ucdavis.edu

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Received on Thu May 09 2002 - 15:18:58 CDT

Original text of this message

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