RE: ORACLE automatic update statistics better??

Isn't it better to use REPEAT for method_opt?

If auto statistic gathering is using histogram and you gather without 
histogram, next time histogram will be gathered, no?

You can find the default method_opt by executing - select 
dbms_stats.get_param('method_opt') from dual;

exec 
dbms_stats.gather_table_stats(user,tabname=>'&tbl',estimate_percent=>1,cascade=>TRUE,method_opt=>'FOR
 ALL COLUMNS SIZE REPEAT');

Michael Dinh : XIFIN : 858.436.2929
 
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Powell, Mark
Sent: Friday, August 13, 2010 8:14 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: ORACLE automatic update statistics better??

 
The Oracle provided job will gather histograms by default and that is pretty 
the main difference from the statistics collection command you posted.

You should not need to manually gather statistics except in those cases where 
you create and load a new table and want statistics now rather than wait on the 
Oracle job task to generate statistics and in those cases where the generated 
statistics do now work well.  You may be better off without histograms on a 
specific table, etc....



-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of dba1 mcc
Sent: Friday, August 13, 2010 11:09 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: ORACLE automatic update statistics better??

we have ORACLE 10GR2 on LINUX server.  Our consultant don't allow us "manually" 
to run "update statistics".  Consultant say ORACLE 10GR2 automatic update 
statistics algorithm better than manually command.

The SQL command we used to manually run is:

execute DBMS_STATS.GATHER_SCHEMA_STATS (ownname=> UPPER('&ID'), 
estimate_percent=> dbms_stats.auto_sample_size, method_opt=> 'FO R ALL INDEXED 
COLUMNS SIZE 1', DEGREE=> DBMS_STATS.DEFAULT_DEGREE, cascade=>TRUE)

I would like listen your opinion.

Thanks.


      
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