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Home -> Community -> Mailing Lists -> Oracle-L -> RE: DBA_EXTENTS problem
Do you have a lot of locally managed tablespaces? Doing a read from dba_extents can cause quite an I/O with locally managed tablespaces.
My 2 cents.
Raj
Janardhana
Babu Donga To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
<jbdonga_at_ucda cc:
vis.edu> Subject: RE: DBA_EXTENTS problem
Sent by:
root_at_fatcity.
com
May 09, 2002
04:38 PM
Please
respond to
ORACLE-L
I have deleted the statistics from 'SYS' and SYSTEM' as suggested by Suzy and made sure that they were gone by issuing the query:
select table_name,owner
from dba_tables
where owner in ('SYS','SYSTEM')
and last_analyzed is not null;
It returned no rows this time. But why is my query: select count(*) from dba_extents is still sitting there? Is there anything else I should do? Restart the DB/something??
Thanks for any response.
-- Babu
-----Original Message-----
[mailto:Rachel_Carmichael_at_Sonymusic.com]
Sent: Thursday, May 09, 2002 1:19 PM
To: Multiple recipients of list ORACLE-L
I knew someone on the list would have it :) thanks Suzy.
actually, I'd do dbms_stats.delete_schema_stats('SYS') this time through to
fix
the problem and then change the dbms_stats command to
dbms_stats.gather_schema_stats instead of database
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| | lvordos_at_qwest|
| | .com |
| | |
| | 05/09/2002 |
| | 03:44 PM |
| | Please |
| | respond to |
| | ORACLE-L |
| | |
|--------+-----------------------> >----------------------------------------------------| | | | To: ORACLE-L_at_fatcity.com | | cc: (bcc: Rachel Carmichael) | | Subject: Re: DBA_EXTENTS problem | >----------------------------------------------------|
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 30minutes.
> 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 isthe
> 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 inthe
> 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 slowthings
> 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: INET: Rajesh.Rao_at_jpmchase.com 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).Received on Thu May 09 2002 - 16:24:41 CDT
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