ORACLE 11.2.0.3 不停机处理SYSAUX表空间一直增长问题_python

表象

SYSAUX表空间一直增长，一个月增长快10G，需要定时维护表空间

原因

oracle bug引起 (Doc ID 1055547.1)

MMON performs the purge of the optimizer stats history automatically. However it has an internal limit of 5 minutes to perform this job. If the operation takes more than 5 minutes, then it is aborted and stats not purged.
No trace or alert message is reported.

处理方式-不打补丁禁用统计信息

因为进行统计信息收集时需要往下面相关表插入数据，清理期间不能进行统计数据收集。

wri$_optstat_tab_history

wri$_optstat_ind_history

wri$_optstat_histhead_history

wri$_optstat_histgrm_history

登录ebs将两个（一个GL、一个ALL）计划请求统计数据模式给取消掉（取消前截屏备份参数）。

删除历史数据

下面所有sql均以 sys as dba 执行

先算出现有数据总最早日期是多少天前的。

SELECT TRUNC(SYSDATE) - TO_DATE(to_char(MIN(savtime), 'YYYY-MM-DD'), 'yyyy-mm-dd')
  FROM sys.WRI$_OPTSTAT_HISTHEAD_HISTORY;

假设是190天，则通过远程桌面登录sqlplus （下面这个sql可能耗时好几天，需要后台运行或者远程桌面运行）


set serveroutput on
BEGIN
DBMS_OUTPUT.ENABLE(buffer_size => null);
for i in reverse 10..190
loop
dbms_output.put_line(to_char(sysdate,'YYYY-MM-DD HH24:MI:SS') || '-Begin    delete Day ' || i );
dbms_stats.purge_stats(sysdate-i);
COMMIT;
dbms_output.put_line(to_char(sysdate,'YYYY-MM-DD HH24:MI:SS') || '-Complete delete Day ' || i );
end loop;
end;
/

上面这个sql可能执行数天，执行完成后利用shink进行表收缩。

进行表收缩

--先备份索引数据
select dbms_metadata.get_ddl('INDEX','I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST','SYS') from dual;
select dbms_metadata.get_ddl('INDEX','I_WRI$_OPTSTAT_HH_ST','SYS') from dual;

-- Drop indexes 
drop index I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST;
drop index I_WRI$_OPTSTAT_HH_ST;

--开启行迁移
alter table WRI$_OPTSTAT_HISTHEAD_HISTORY enable row movement; 

--进行收缩（此处没有用move是为了节省空间）
alter table WRI$_OPTSTAT_HISTHEAD_HISTORY shrink space cascade;

--收缩完毕后进行索引重建
CREATE UNIQUE INDEX "SYS"."I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST" ON "SYS"."WRI$_OPTSTAT_HISTHEAD_HISTORY" ("OBJ#", "INTCOL#", SYS_EXTRACT_UTC("SAVTIME"), "COLNAME") 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "SYSAUX" ;


CREATE INDEX "SYS"."I_WRI$_OPTSTAT_HH_ST" ON "SYS"."WRI$_OPTSTAT_HISTHEAD_HISTORY" (SYS_EXTRACT_UTC("SAVTIME")) 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "SYSAUX" ;

收集统计信息

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

查看效果


SELECT *
  FROM (SELECT owner, segment_name, segment_type, SUM(bytes) / 1024 / 1024 / 1024 GB
          FROM dba_segments
         WHERE tablespace_name = 'SYSAUX'
         GROUP BY owner, segment_name, segment_type
         ORDER BY 4 DESC)
 WHERE rownum < 10;

SELECT occupant_name "Item",
       space_usage_kbytes / 1048576 "Space Used (GB)",
       schema_name "Schema",
       move_procedure "Move Procedure"
  FROM v$sysaux_occupants
 ORDER BY space_usage_kbytes DESC;