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 <[EMAIL PROTECTED]> 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:[EMAIL PROTECTED]] > 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@y| > | | ahoo.com | > | | | > | | 05/09/2002 | > | | 02:18 PM | > | | Please | > | | respond to | > | | ORACLE-L | > | | | > |--------+-----------------------> > > >----------------------------------------------------| > | > | > | To: [EMAIL PROTECTED] > | > | 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 <[EMAIL PROTECTED]> > 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: [EMAIL PROTECTED] > > > > 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: [EMAIL PROTECTED] (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). > > > __________________________________________________ > Do You Yahoo!? > Yahoo! Shopping - Mother's Day is May 12th! > http://shopping.yahoo.com > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Jack Silvey > INET: [EMAIL PROTECTED] > > 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: [EMAIL PROTECTED] (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). > > > > > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: > INET: [EMAIL PROTECTED] > > 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: [EMAIL PROTECTED] (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). > -- > Please see the official ORACLE-L FAQ: > http://www.orafaq.com > -- > Author: Janardhana Babu Donga > INET: [EMAIL PROTECTED] > > === message truncated === __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Mother's Day is May 12th! http://shopping.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Jack Silvey INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
