1.查看自动收集统计信息的任务及状态
sys@ora11g> select client_name,status from dba_autotask_client;

CLIENT_NAME STATUS
------------------------------------- --------
auto optimizer stats collection ENABLED
auto space advisor ENABLED
tuning advisor ENABLED

其中“auto optimizer stats collection”便是我们要寻找的自动收集统计信息的任务名称，它的状态目前是启用状态。

2.禁止自动sql tuning advisor的任务
我们可以使用DBMS_AUTO_TASK_ADMIN包完成这个任务。
sys@ora11g> exec DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'sql tuning advisor',operation => NULL,window_name => NULL);

PL/SQL procedure successfully completed.

sys@ora11g> select client_name,status from dba_autotask_client;

CLIENT_NAME STATUS
------------------------------------- --------
auto optimizer stats collection ENABLED
auto space advisor ENABLED
sql tuning advisor DISABLED

此时“sql tuning advisor”任务已经被禁用，目的达到。

3.启用sql tuning advisor的任务
sys@ora11g> exec DBMS_AUTO_TASK_ADMIN.ENABLE(client_name => 'sql tuning advisor',operation => NULL,window_name => NULL);

PL/SQL procedure successfully completed.

sys@ora11g> select client_name,status from dba_autotask_client;

CLIENT_NAME STATUS
------------------------------------- --------
auto optimizer stats collection ENABLED
auto space advisor ENABLED
sql tuning advisor ENABLED