EXP_HEAD$占用sysaux空间大的处理办法

可以在线做，不需要停业务  (Doc ID 2354960.1)

1. Disable future monitoring:

alter system set "_column_tracking_level"=17 scope=both;
--wait 10 minutes

2. To purge data from tables:

exec DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO();    --执行时间比较久（30分钟左右）
truncate table sys.exp_head$ drop storage;
truncate table sys.exp_obj$ drop storage;
truncate table sys.exp_stat$ drop storage;
alter index SYS.I_EXP_HEAD$ rebuild tablespace sysaux online;
alter index SYS.I_EXP_STAT$ rebuild tablespace sysaux online;
alter index SYS.I_EXP_OBJ$ rebuild tablespace sysaux online;

3.To re-enable expression statistics monitoring later :

alter system set "_column_tracking_level"=21 scope=both;   --非oracle19c 执行这条

Starting in 19c we would change this to 53 since that is the default value for this version higher.

alter system set "_column_tracking_level"=53 scope=both;  --oracle 19c需要执行这条