SYSAUX表空间清理

一.清理SYSAUX下的历史统计信息

1.将历史统计信息保留时间设为无限

 exec dbms_stats.alter_stats_history_retention(-1);

2.truncate较大的TABLE

 truncate table sys.WRI$_OPTSTAT_HISTHEAD_HISTORY;
 truncate table sys.WRI$_OPTSTAT_HISTGRM_HISTORY;

3.清理历史统计信息

 exec dbms_stats.purge_stats(sysdate-101);
 exec dbms_stats.purge_stats(sysdate-51);
 exec dbms_stats.purge_stats(sysdate-5);

4.将历史统计信息保留时间设为10天

 exec dbms_stats.alter_stats_history_retention(10);

5.将历史统计信息相关的表进行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_HISTGRM_HISTORY move tablespace sysaux;
 alter index sys.I_WRI$_OPTSTAT_H_OBJ#_ICOL#_ST rebuild online;
 alter index sys.I_WRI$_OPTSTAT_H_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$_OPTSTAT_IND_ST rebuild online;
 alter table sys.WRI$_OPTSTAT_TAB_HISTORY move tablespace sysaux;
 alter index sys.I_WRI$_OPTSTAT_TAB_OBJ#_ST rebuild online;
 alter index sys.I_WRI$_OPTSTAT_TAB_ST rebuild online;
 ALTER TABLE SYS.WRI$_OPTSTAT_OPR MOVE TABLESPACE SYSAUX;
 ALTER TABLE SYS.WRI$_OPTSTAT_AUX_HISTORY MOVE TABLESPACE SYSAUX;
 ALTER INDEX SYS.I_WRI$_OPTSTAT_AUX_ST REBUILD ONLINE;
 ALTER INDEX SYS.I_WRI$_OPTSTAT_OPR_STIME REBUILD ONLINE;

6.对MOVE表的统计信息进行收集

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

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_IND_HISTORY',cascade => TRUE);

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

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

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

二.清理SYAUX下的无效ASH信息

1.检查是否有无效的ASH信息

 select count(*)
 from sys.wrh$_active_session_history a
 where not exists (select 1
 from sys.wrm$_snapshot b
 where a.snap_id = b.snap_id
 and a.dbid = b.dbid
 and a.instance_number = b.instance_number);

2.清理无效的ASH信息

 delete
 from sys.wrh$_active_session_history a
 where not exists (select 1
 from sys.wrm$_snapshot b
 where a.snap_id = b.snap_id
 and a.dbid = b.dbid
 and a.instance_number = b.instance_number);

3.对ASH表清理后的碎片整理

 alter table sys.wrh$_active_session_history enable row movement;
 alter table sys.wrh$_active_session_history shrink space cascade;
 alter table sys.wrh$_active_session_history disable row movement;

4.收集碎片整理后表的统计信息

 EXEC dbms_stats.gather_table_stats(ownname => 'SYS',tabname => 'WRH$_ACTIVE_SESSION_HISTORY',cascade => TRUE);

5.检查表空间可收缩的的位置

select a.FILE#,
a.NAME,
a.BYTES /1024/1024 mb,
ceil(HWM * A.BLOCK_SIZE) /1024/1024 RESIZETO,
'ALTER DATABASE DATAFILE ' || A.NAME || ' RESIZE ' ||
(trunc(CEIL(HWM * A.BLOCK_SIZE)/1024/1024)+20) || 'M;' RESIZECMD
from v$datafile a,
(SELECT C.file_id, MAX(C.block_id + C.blocks-1) HWM
FROM DBA_EXTENTS C
GROUP BY FILE_ID) B
WHERE A.FILE# = B.FILE_ID
AND a.NAME='/u01/app/oracle/oradata/PROD2/sysaux01.dbf' ORDER BY 5;

三.SYSAUX清理后的检查

1.清理后的无效INDEX检查

 select * from dba_indexes where status<>'VALID' AND STATUS<>'N/A';

SELECT * FROM DBA_IND_PARTITIONS WHERE STATUS<>'USABLE' AND STATUS<>'N/A';

SELECT * FROM DBA_IND_SUBPARTITIONS WHERE STATUS<>'USABLE';

上面语句应均无数据返回，如有则对这些INDEX进行重建

2.清理后的INDEX并行度检查

 select * from dba_indexes where degree not in (’1′,’0′,’DEFAULT’);