几个常规的清理SYSAUX表空间动作

下面介绍一下如何清理SYSAUX表空间 Statistics space used by SM/OPTSTAT in the SYSAUX tablespace is not reclaimed after purging [ID 454678.1]Reduce SYSAUX Tablespace Occupancy Due to Fragmented TABLEs and INDEXes [ID 1271178.1]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TABLEtruncate 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MOVEalter 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$_active_session_history awhere not exists (select 1from sys.wrm$_snapshot bwhere a.snap_id = b.snap_idand a.dbid = b.dbidand a.instance_number = b.instance_number);2.清理无效的ASH信息deletefrom sys.wrh$_active_session_history awhere not exists (select 1from sys.wrm$_snapshot bwhere a.snap_id = b.snap_idand a.dbid = b.dbidand 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);3.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;’ RESIZECMDfrom v$datafile a,(SELECT C.file_id, MAX(C.block_id + C.blocks – 1) HWMFROM DBA_EXTENTS CGROUP BY FILE_ID) BWHERE A.FILE# = B.FILE_IDAND a.tablespace=’SYSAUX’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’);