Update statistics using .GATHER_SCHEMA_STATS( options= 'GATHER AUTO')

Hi!
We have recently upgraded from Oracle 9.2.0.8 to Oracle 10.2.0.4. We are still running our nightly job, starting every day at 0400AM:
begin
dbms_stats.gather_schema_stats('TRADER', estimate_percent =>DBMS_STATS.AUTO_SAMPLE_SIZE, method_opt => 'for all columns size repeat', degree => DBMS_STATS.DEFAULT_DEGREE, cascade=>TRUE);
end;However the Oracle daily maintance window also gathers statistics and our nightly statistics gathering might be superflous. The Oracles nightly maintance window appears like a black box to me and I don't really know what happens there. Can anyone please point to some place where I can find more information related to that or even write some information in this thread?
Also, I have recently discovered the "GATHER AUTO" option for DBMS_STATS.GATHER_SCHEMA_STATS:
declare
    m_object_list    dbms_stats.objecttab;
begin
dbms_stats.gather_schema_stats(
    ownname        => 'TRADEDB',
    options        => 'GATHER AUTO',
    objlist        => m_object_list
end;
/We have a large OLTP enterprise system (approx 200GB just to give an indication), where there is a lot of DML on tables at various times of the day. Some tables may get outdated statistics before the nightly run.
Does it make sense to run the above "GATHER AUTO"-code every hour or half an hour to keep our schema statistics up to date?
Information about our database:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE     10.2.0.4.0     Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - ProductionThanks in advance for you help and please let me know if you need more information.

Can anyone please point to some place where I can find more information related to that or even write some information in this thread?http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/stats.htm#i41282
( from doing a quick search from the http://www.oracle.com/pls/db102/homepage )

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It it necessary to enable monitoring if you use GATHER_SCHEMA_STATS with the GATHER AUTO or GATHER STALE options? What will happen if I donot enable monitoring and do the following:
EXEC DBMS_STATS.GATHER_SCHEMA_STATS(ownname=>'SCOTT', options=>'GATHER AUTO');
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OPTIONS=> 'GATHER STALE'
When executing dbms_stats, statistics are first flushed from SGA and then
segments with stale stats are examined.
Oracle will gather statistics on objects which have statistics considered to
be STALE. This is done by looking at the tabmodifications views.
Answering to your question, if you didn't enable table monitoring and run gather stale option, you wont get any error. Simple, oracle doesn't collect stats, since there is no information available in tabmodifications views.
OPTIONS=>GATHER AUTO
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statistics (even if there have NO MONITORING) plus existing objects with STALE
statistics. GATHER AUTO (just like GATHER STALE) requires monitoring to be turned
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Dear Team,
We are getting ORA-01031: insufficient privileges error whenever we have tried to execute the update or table statistics using brtools on our SAP development server. I have checked the permissions of sapcheck directory and changed it to 775 still error remains the same. I have observed, it is failing to create the sta or chk files in sapcheck directory after executing update statistics using Brtools.
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Thanks and Regards,
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Dear All,
Thanks for your responses.
Permissions are set as below for br* files.
sap-dev:devadm 23> ls -ltr br*
-rwxrwxr-x   1 oradev     sapsys     3437688 Oct 31 2008 brarchive
-rwxrwxr-x   1 oradev     sapsys     3547760 Oct 31 2008 brbackup
-rwxrwxr-x   1 oradev     sapsys     4632408 Oct 31 2008 brconnect
-rwxrwxr-x   1 devadm     sapsys     3850224 Oct 31 2008 brrecover
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-rwxrwxr-x   1 devadm     sapsys     4837672 Oct 31 2008 brspace
-rwxrwxr-x   1 oradev     sapsys     2175208 Oct 31 2008 brtools
I guess it is fine because with these set of permissions, it is working absolutely fine in my quality system.
QAS Permissions are as belows for your information
sap-qas:qa1adm 22> ls -ltr br*
-rwsrwxr-x   1 oraqa1     sapsys     3437688 Oct 31 2008 brarchive
-rwsrwxr-x   1 oraqa1     sapsys     3547760 Oct 31 2008 brbackup
-rwsrwxr-x   1 oraqa1     sapsys     4632408 Oct 31 2008 brconnect
-rwxrwxr-x   1 qa1adm     sapsys     3850224 Oct 31 2008 brrecover
-rwxrwxr-x   1 qa1adm     sapsys     1480656 Oct 31 2008 brrestore
-rwxrwxr-x   1 qa1adm     sapsys     4837672 Oct 31 2008 brspace
-rwsrwxr-x   1 oraqa1     sapsys     2175208 Oct 31 2008 brtools
So do you feel still it has something to do with permissions?
Thanks and Regards,
Kedar

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FYI.. this is what happens inside the concurrent progarm call.. there are a few additional parameters for output/ error msgs:
procedure GATHER_SCHEMA_STATS(errbuf out varchar2,
retcode out varchar2,
schemaname in varchar2,
estimate_percent in number,
degree in number ,
internal_flag in varchar2,
request_id in number,
hmode in varchar2 default 'LASTRUN',
options in varchar2 default 'GATHER',
modpercent in number default 10,
invalidate in varchar2 default 'Y'
is
exist_insufficient exception;
bad_input exception;
pragma exception_init(exist_insufficient,-20000);
pragma exception_init(bad_input,-20001);
l_message varchar2(1000);
Error_counter number := 0;
Errors Error_Out;
-- num_request_id number(15);
conc_request_id number(15);
degree_parallel number(2);
begin
-- Set the package body variable.
stathist := hmode;
-- check first if degree is null
if degree is null then
degree_parallel:=def_degree;
else
degree_parallel := degree;
end if;
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|| ' percent= '|| to_char(estimate_percent) || ' degree = '
|| to_char(degree_parallel) || ' internal_flag= '|| internal_flag ;
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exception
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raise;
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l_message := errbuf;
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raise;
when others then
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retcode := '2';
l_message := errbuf;
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raise;
END;
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Error_counter:=i+1;
FND_FILE.put_line(FND_FILE.log,'Error #'||Error_counter||
': '||Errors(i));
-- added to send back status to concurrent program manager bug 2625022
errbuf := sqlerrm ;
retcode := '2';
END LOOP;
end;

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'ORACLE' - Statistics are collected for all Oracle owned objects
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Update statistics using .GATHER_SCHEMA_STATS( options= 'GATHER AUTO')

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