DBMS_STATS in an Oracle Database
Using DBMS_STATS package to gather Oracle dictionary statistics.
SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS(ownname =>'HR', tabname =>'EMP')
SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS(ownname => 'HR', tabname => 'EMP', estimate_percent =>50); SQL> EXECUTE DBMS_STATS.GATHER_SCHEMA_STATS('HR', estimate_percent =>50);
SQL> EXECUTE DBMS_STATS.gather_table_Stats( ownname => 'SCOTT', tabname => 'SOME_TABLE', partname => 'P69');
EXECUTE DBMS_STATS.gather_table_stats ( ownname=>'HR', tabname=>'EMP', partname=>'P69', estimate_percent=>DBMS_STATS.AUTO_SAMPLE_SIZE, cascade=>FALSE, degree=>DBMS_STATS.AUTO_DEGREE, granularity=>'PARTITION' );
This will work exclusively and only on the partition specified (here P69) ignoring all indexes.
SQL> EXEC DBMS_STATS.GATHER_SCHEMA_STATS(ownname =>'HR', ESTIMATE_PERCENT => DBMS_STATS.AUTO_SAMPLE_SIZE, DEGREE => DBMS_STATS.AUTO_DEGREE);
EXEC DBMS_STATS.GATHER_TABLE_STATS(USER, 'SESSIONS', ESTIMATE_PERCENT => DBMS_STATS.AUTO_SAMPLE_SIZE, DEGREE => DBMS_STATS.AUTO_DEGREE);
exec dbms_stats.gather_index_stats( ownname=> 'EB_OLTP' ,indname=>'PK_MESSENGER_GROUP' ,estimate_percent=> DBMS_STATS.AUTO_SAMPLE_SIZE ,degree=> 6 ,no_invalidate=> DBMS_STATS.AUTO_INVALIDATE ,granularity=> 'AUTO');
select 'exec dbms_stats.gather_index_stats( ownname=> '''||owner||''' ,indname=>''' || index_name ||''' ,estimate_percent=> DBMS_STATS.AUTO_SAMPLE_SIZE , degree=> 6 ,no_invalidate=> DBMS_STATS.AUTO_INVALIDATE ,granularity=> ''AUTO'');' from dba_indexes where owner ='HR';
Cheers!!
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