SYSAUX表空间过大问题 查看 v$sysaux_occupants 确认占用空间对象 select occupant_name,space_usage_kbytes from v$sysaux_occupants order by space_usage_kbytes desc; 查询结果： SM/ADVISOR 32741952 通过 dba_segments 进一步确认 select segment_name,owner,tablespace_name,bytes/1024/1024"SIZE(MB)",segment_type from dba_segments where tablespace_name='SYSAUX' order by bytes desc; 查看结果： WRI$_ADV_OBJECTS SYS SYSAUX 14497 TABLE WRI$_ADV_OBJECTS_IDX_01 SYS SYSAUX 6907 INDEX WRI$_ADV_OBJECTS_IDX_02 SYS SYSAUX 5761 INDEX WRI$_ADV_OBJECTS_PK SYS SYSAUX 4804 INDEX
原因：
因为在 12.2中，引入了新的特性：optimizer statistics advisor。优化器统计信息顾问每天都会在维护窗口运行，auto_stats_advisor_task多次运行，因而会消耗大量sysaux表空间。 解决方案：
1、删除statistics advisor task(auto_stats_advisor_task),删除该任务后就可以释放统计信息顾问产生的数据 declare v_tname varchar2(32767); begin v_tname :='AUTO_STATS_ADVISOR_TASK'; dbms_stats.drop_advisor_task(v_tname); end; /
在删除任务的过程中，可能会遇到下面的错误： ORA-20001:Statistics Advisor: Invalid TaskName For thecurrent user
如果遇到上面的错误，可以先重建 AUTO_STATS_ADVISOR_TASK来解决问题：
SQL>connect as sysdba
SQL>EXEC DBMS_STATS.INIT_PACKAGE();
删除任务后，重新组织表和索引 alter table wri$_adv_objects move; alter index wri$_adv_objects_idx_01 rebuild; alter index wri$_adv_objects_idx_02 rebuild; alter index wri$_adv_objects_pk rebuild;
如果 WRI$_ADV_OBJECTS 记录过多，delete以上会占用较大undo,可以把想要的数据存储在临时表，truncate table WRI$_ADV_OBJECTS,再insert回来。 create table wri$_adv_objects_new tablespace ticket_data as select * from wri$_adv_objects where task_id !=(select distinct id from wri$_adv_tasks where name='AUTO_STATS_ADVISOR_TASK'); SQL> select count(*)from wri$_adv_objects_new; COUNT(*) ---------- 2968 insert /*+ APPEND */ into wri$_adv_objects select * from wri$_adv_objects_new;
truncate后查看空间占用： select OCCUPANT_NAME,OCCUPANT_DESC,SPACE_USAGE_KBYTES/1024 USAGE_MB from V$SYSAUX_OCCUPANTS order by SPACE_USAGE_KBYTES DESC; SM/ADVISOR Server Manageability - Advisor Framework 6.1875
2、缩短任务执行历史的保存时间
确认当前设定的保持期间（ 30天或UNLIMITED）
修改设定的保持期间
可以通过下面的命令，将 EXECUTION_DAYS_TO_EXPIRE修改为15天，即执行历史数据的保存时间为7天： connect as sysdba BEGIN DBMS_SQLTUNE.SET_TUNING_TASK_PARAMETER ( task_name => 'AUTO_STATS_ADVISOR_TASK' , parameter => 'EXECUTION_DAYS_TO_EXPIRE' , value => 15 ); END; /
3、也可以禁用该任务，而不是删除。 declare filter1 clob; begin filter1 := dbms_stats.configure_advisor_rule_filter('AUTO_STATS_ADVISOR_TASK', 'EXECUTE', NULL, 'DISABLE'); END; /
