1、种类
10g里的自动任务有两种：
- AUTO_SPACE_ADVISOR_JOB，自动空间顾问JOB
- GATHER_STATS_JOB，自动收集统计信息JOB
11g里的自动任务有三种：
- auto optimizer stats collection，自动统计信息收集顾问
- auto space advisor，自动空间顾问
- sql tuning advisor，sql调优顾问
2、实现方式
10g里的自动任务是以SCHEDULER的JOB形式运行的，可以在dba_scheduler_jobs视图里查到相关的JOB。
SQL>
set
linesize 200
SQL> col owner
for
a30
SQL> col job_name
for
a30
SQL>
select
owner,job_name
from
dba_scheduler_jobs
where
job_class=
'AUTO_TASKS_JOB_CLASS'
;
OWNER JOB_NAME
------------------------------ ------------------------------
SYS AUTO_SPACE_ADVISOR_JOB
SYS GATHER_STATS_JOB
11g里的自动任务使用的是11g的新特性AUTOTASK的方式实现的。可以从dba_autotask_client视图中查到相关信息。
sys@TEST>
SELECT
client_name,status
FROM
dba_autotask_client;
CLIENT_NAME STATUS
---------------------------------------- ------------------------
auto optimizer stats collection ENABLED
auto
space
advisor ENABLED
sql tuning advisor ENABLED
3、维护窗口时间
两个版本中自动任务的执行时间是不同的。
10g中分为两个时间段WEEKNIGHT_WINDOW和WEEKEND_WINDOW，可以从dba_scheduler_windows视图中查到。它们分别的运行开始时间和持续时间为：
WEEKNIGHT_WINDOW，每周一至周五晚22:00:00开始，持续8小时
WEEKEND_WINDOW，第周六00:00:00，持续2天
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11g中维护窗口分得更细，分为7个，即第一天个维护窗口，可以针对不同的需求做出更细粒度的调整，dba_scheduler_windows视图中查到，分别为MONDAY_WINDOW,TUESDAY_WINDOW,WEDNESDAY_WINDOW,THURSDAY_WINDOW,FRIDAY_WINDOW,SATURDAY_WINDOW,SUNDAY_WINDOW。开始时间和持续时间分别为：
周一到周五晚22:00:00开始，持续4小时，周六和周日早6:00:00开始，执行20小时。
4、维护方式
由于10g和11g中实现方式的不同，维护方式自然就不一样了。
10g的维护方式与普通的SCHEDULER的JOB一样。
--停用JOB
SQL>
exec
dbms_scheduler.disable(
'AUTO_SPACE_ADVISOR_JOB'
);
PL/SQL
procedure
successfully completed.
SQL>
select
enabled
from
dba_scheduler_jobs
where
job_name=
'AUTO_SPACE_ADVISOR_JOB'
;
ENABLED
---------------
FALSE
--启用JOB
SQL>
exec
dbms_scheduler.ENABLE(
'AUTO_SPACE_ADVISOR_JOB'
);
PL/SQL
procedure
successfully completed.
SQL>
select
enabled
from
dba_scheduler_jobs
where
job_name=
'AUTO_SPACE_ADVISOR_JOB'
;
ENABLED
---------------
TRUE
下面重点介绍11g里自动任务的维护。
1)停用和启用自动维护任务
--停用sql tuning advisor
sys@TEST>
BEGIN
2 dbms_auto_task_admin.disable(
3 client_name =>
'sql tuning advisor'
,
4 operation =>
NULL
,
5 window_name =>
NULL
);
6
END
;
7 /
PL/SQL
procedure
successfully completed.
sys@TEST>
select
client_name,status
from
dba_autotask_client;
CLIENT_NAME STATUS
---------------------------------------- ------------------------
auto optimizer stats collection ENABLED
auto
space
advisor ENABLED
sql tuning advisor DISABLED
--启用sql tuning advisor
sys@TEST>
BEGIN
2 dbms_auto_task_admin.enable(
3 client_name =>
'sql tuning advisor'
,
4 operation =>
NULL
,
5 window_name =>
NULL
);
6
END
;
7 /
PL/SQL
procedure
successfully completed.
sys@TEST>
select
client_name,status
from
dba_autotask_client;
CLIENT_NAME STATUS
---------------------------------------- ------------------------
auto optimizer stats collection ENABLED
auto
space
advisor ENABLED
sql tuning advisor ENABLED
--停用所有维护窗口下的所有的自动任务
sys@TEST>
exec
dbms_auto_task_admin.disable;
PL/SQL
procedure
successfully completed.
sys@TEST>
select
window_name,autotask_status
from
dba_autotask_window_clients;
WINDOW_NAME AUTOTASK_STATUS
------------------------------ ------------------------
MONDAY_WINDOW DISABLED
TUESDAY_WINDOW DISABLED
WEDNESDAY_WINDOW DISABLED
THURSDAY_WINDOW DISABLED
FRIDAY_WINDOW DISABLED
SATURDAY_WINDOW DISABLED
SUNDAY_WINDOW DISABLED
7
rows
selected.
--启用所有维护窗口下的所有自动任务
sys@TEST>
exec
dbms_auto_task_admin.enable;
PL/SQL
procedure
successfully completed.
sys@TEST>
select
window_name,autotask_status
from
dba_autotask_window_clients;
WINDOW_NAME AUTOTASK_STATUS
------------------------------ ------------------------
WEDNESDAY_WINDOW ENABLED
FRIDAY_WINDOW ENABLED
SATURDAY_WINDOW ENABLED
THURSDAY_WINDOW ENABLED
TUESDAY_WINDOW ENABLED
SUNDAY_WINDOW ENABLED
MONDAY_WINDOW ENABLED
7
rows
selected.
--停用针对某个维护窗口的自动任务
sys@TEST>
BEGIN
2 dbms_auto_task_admin.disable(
3 client_name =>
'sql tuning advisor'
,
4 operation =>
NULL
,
5 window_name =>
'MONDAY_WINDOW'
);
6
END
;
7 /
PL/SQL
procedure
successfully completed.
sys@TEST>
select
window_name,autotask_status,sql_tune_advisor
from
dba_autotask_window_clients;
WINDOW_NAME AUTOTASK_STATUS SQL_TUNE_ADVISOR
------------------------------ ------------------------ ------------------------
MONDAY_WINDOW ENABLED DISABLED
TUESDAY_WINDOW ENABLED ENABLED
WEDNESDAY_WINDOW ENABLED ENABLED
THURSDAY_WINDOW ENABLED ENABLED
FRIDAY_WINDOW ENABLED ENABLED
SATURDAY_WINDOW ENABLED ENABLED
SUNDAY_WINDOW ENABLED ENABLED
7
rows
selected.
2、配置维护窗口
这个与10g的类似，都是使用dbms_scheduler包来操作
--修改维护窗口的属性，把SATURDAY_WINDOW的持续时间修改为4小时
sys@TEST>
BEGIN
2 dbms_scheduler.disable(
3
name
=>
'SATURDAY_WINDOW'
);
4 dbms_scheduler.set_attribute(
5
name
=>
'SATURDAY_WINDOW'
,
6 attribute =>
'DURATION'
,
7 value => numtodsinterval(4,
'hour'
));
8 dbms_scheduler.enable(
9
name
=>
'SATURDAY_WINDOW'
);
10
END
;
11 /
PL/SQL
procedure
successfully completed.
sys@TEST>
SELECT
duration
FROM
dba_scheduler_windows
WHERE
window_name=
'SATURDAY_WINDOW'
;
DURATION
---------------------------------------------------------------------------
+000 04:00:00