Abnormal growth of sysaux table space statistics data is not automatically clean up

First is to check sysaux table space in the most space components and objects

select OCCUPANT_NAME,OCCUPANT_DESC,SPACE_USAGE_KBYTES/1024 USAGE_MB
from V$SYSAUX_OCCUPANTS order by SPACE_USAGE_KBYTES desc;

SELECT D.SEGMENT_NAME, D.SEGMENT_TYPE,SUM(BYTES)/1024/1024 SIZE_MB
  FROM DBA_SEGMENTS D
 WHERE D.TABLESPACE_NAME = 'SYSAUX'
 GROUP BY D.SEGMENT_NAME, D.SEGMENT_TYPE
 ORDER BY SIZE_MB DESC;

If you find that the problem of statistical information, can be cleaned as follows:

 

A law: purge (delete with the underlying delete)

Show the current history level:

select dbms_stats.get_stats_history_availability from dual;

Assuming  history is 100 days old and you want to purge it until 10 days old:

begin
for i in reverse 10..100
loop
dbms_stats.purge_stats(sysdate-i);
end loop;
end;
/

Show the new history level

select dbms_stats.get_stats_history_availability from dual;

 

Act II: truncate

The next purge only when the situation is still not free up space, or too large to be deleted, it is recommended to clean up with a way to truncate.

Backup to delete the latest data base table

create table SYS.WRI$_OPTSTATHISTHEADHISTORYBAK as (select * from sys.wri$_optstat_histhead_history where savtime > SYSDATE - 14);
create table SYS.WRI$_OPTSTATHISTGRMHISTORYBAK as (select * from sys.WRI$_OPTSTAT_HISTGRM_HISTORY where savtime > SYSDATE - 14);
create table SYS.WRI$_OPTSTAT_TAB_BAK as (select * from sys.wri$_optstat_tab_history where savtime > SYSDATE - 14);
create table SYS.WRI$_OPTSTAT_IND_BAK as (select * from sys.wri$_optstat_ind_history where savtime > SYSDATE - 14);

View SM / OPTSTAT number of days (for storing old statistics) Reserved

select dbms_stats.get_stats_history_retention from dual; 

Set Time SM / OPTSTAT reserved (-1 indicates unlimited)

exec dbms_stats.alter_stats_history_retention(-1);

truncate larger TABLE

truncate table sys.WRI$_OPTSTAT_HISTHEAD_HISTORY;
truncate table sys.WRI$_OPTSTAT_HISTGRM_HISTORY;
truncate table  sys.wri$_optstat_ind_history;
truncate table  sys.wri$_optstat_tab_history;

Cleanup historical statistics

 exec dbms_stats.purge_stats(sysdate-300);
 exec dbms_stats.purge_stats(sysdate-200);
 exec dbms_stats.purge_stats(sysdate-100);
 exec dbms_stats.purge_stats(sysdate-30);

The historical statistics retention time to 30 days

exec dbms_stats.alter_stats_history_retention(30);
select dbms_stats.get_stats_history_retention from dual;

The historical statistics related tables MOVE

alter table sys.WRI$_OPTSTAT_HISTHEAD_HISTORY move tablespace sysaux;
alter index sys.I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST rebuild online;
alter index sys.I_WRI$_OPTSTAT_HH_ST rebuild online;
...
alter table sys.WRI$_OPTSTAT_IND_HISTORY  move tablespace sysaux;
alter index sys.I_WRI$_OPTSTAT_IND_OBJ#_ST rebuild online;
alter index sys.I_WRI$_OPTSTAT_IND_ST rebuild online;

MOVE tables of statistics collected
 

 EXEC dbms_stats.gather_table_stats(ownname => 'SYS',tabname => 'WRI$_OPTSTAT_HISTGRM_HISTORY',cascade => TRUE);
 ...
 EXEC dbms_stats.gather_table_stats(ownname => 'SYS',tabname => 'WRI$_OPTSTAT_HISTHEAD_HISTORY',cascade => TRUE);

 

reference

• http://zxf261.blog.51cto.com/701797/776496
• http://otn-world.blogspot.com/2014/06/purging-optimizer-stats.html
• http://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_stats.htm#ARPLS68644