Gather Stats

10g

SQL> select
DBMS_STATS.GET_PARAM ('AUTOSTATS_TARGET'),
DBMS_STATS.GET_PARAM ('CASCADE'),
DBMS_STATS.GET_PARAM ('DEGREE'),
DBMS_STATS.GET_PARAM ('ESTIMATE_PERCENT'),
DBMS_STATS.GET_PARAM ('METHOD_OPT'),
DBMS_STATS.GET_PARAM ('NO_INVALIDATE'),
DBMS_STATS.GET_PARAM ('GRANULARITY')
from dual;


11g

SQL> select
DBMS_STATS.GET_PREFS ('AUTOSTATS_TARGET'),
DBMS_STATS.GET_PREFS ('CASCADE'),
DBMS_STATS.GET_PREFS ('DEGREE'),
DBMS_STATS.GET_PREFS ('ESTIMATE_PERCENT'),
DBMS_STATS.GET_PREFS ('METHOD_OPT'),
DBMS_STATS.GET_PREFS ('NO_INVALIDATE'),
DBMS_STATS.GET_PREFS ('GRANULARITY'),
DBMS_STATS.GET_PREFS ('PUBLISH'),
DBMS_STATS.GET_PREFS ('INCREMENTAL'),
DBMS_STATS.GET_PREFS ('STALE_PERCENT')
from dual;

10g:

select * from dba_scheduler_jobs where job_name = 'GATHER_STATS_JOB';
select * from dba_scheduler_job_run_details where job_name = 'GATHER_STATS_JOB';
select * from dba_scheduler_job_log where job_name = 'GATHER_STATS_JOB';

SQL> exec dbms_auto_task_admin.enable(client_name => 'auto optimizer stats collection', operation => null, window_name => null);
PL/SQL procedure successfully completed

SQL> exec dbms_auto_task_admin.disable(client_name => 'auto optimizer stats collection', operation => null, window_name => null);

10g:

DBMS_STATS.GET_PARAM('ESTIMATE_PERCENT')
---------------
DBMS_STATS.AUTO_SAMPLE_SIZE

SQL> exec dbms_stats.set_param('ESTIMATE_PERCENT','100');

PL/SQL procedure successfully completed.

SQL> SELECT dbms_stats.get_param('ESTIMATE_PERCENT') FROM dual;

DBMS_STATS.GET_PARAM('ESTIMATE_PERCENT')
---------------
100

SQL> exec dbms_stats.RESET_PARAM_DEFAULTS();

PL/SQL procedure successfully completed.

SQL> SELECT dbms_stats.get_param('ESTIMATE_PERCENT') FROM dual;

DBMS_STATS.GET_PARAM('ESTIMATE_PERCENT')
-------------------------------------------------------------------------------------
DBMS_STATS.AUTO_SAMPLE_SIZE