Oracle Gather stats on database level

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Gather stats in Database level:-

EXEC DBMS_STATS.GATHER_DATABASE_STATS(
ESTIMATE_PERCENT=>100,METHOD_OPT=>'FOR ALL COLUMNS SIZE SKEWONLY',
      CASCADE => TRUE,
      degree => 4,
      OPTIONS => 'GATHER STALE',
      GATHER_SYS => TRUE,
      STATTAB => PROD_STATS);


=======================================================================
CASCADE => TRUE :Gather statistics on the indexes as well. If not used Oracle will decide whether to collect index statistics or not.
DEGREE => 4 :Degree of parallelism.
OPTIONS:
       =>’GATHER’ :Gathers statistics on all objects in the schema.
       =>’GATHER AUTO’ :Oracle determines which objects need new statistics, and determines how to gather those statistics.
       =>’GATHER STALE’:Gathers statistics on stale objects. will return a list of stale objects.
       =>’GATHER EMPTY’:Gathers statistics on objects have no statistics.will return a list of no stats objects.
        =>’LIST AUTO’ : Returns a list of objects to be processed with GATHER AUTO.
        =>’LIST STALE’: Returns a list of stale objects as determined by looking at the *_tab_modifications views.
        =>’LIST EMPTY’: Returns a list of objects which currently have no statistics.
GATHER_SYS => TRUE :Gathers statistics on the objects owned by the ‘SYS’ user.
STATTAB => PROD_STATS :Table will save the current statistics. see SAVE & IMPORT STATISTICS section -last third in this post-.






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