1、修改快照设置

[sql] view plain copy

[email protected]> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

---------- ------------------------- ------------------------------ ----------

1301772781 +00000 01:00:00.0 +00008 00:00:00.0 DEFAULT

[email protected]> exec dbms_workload_repository.modify_snapshot_settings(retention => 15*1440,interval => 30);

PL/SQL 过程已成功完成。

[email protected]> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

---------- ------------------------- ------------------------------ ----------

1301772781 +00000 00:30:00.0 +00015 00:00:00.0 DEFAULT

interval：将间隔设置为0时，oracle将禁止采用自动和手工快照的机制。

retention：当保存时间设置为0时，oracle将永久地保存这个快照。

2、创建和删除快照

[sql] view plain copy

[email protected]> exec dbms_workload_repository.create_snapshot();

PL/SQL 过程已成功完成。

[email protected]> exec dbms_workload_repository.drop_snapshot_range(low_snap_id => 10,high_snap_id => 12);

PL/SQL 过程已成功完成。

[email protected]> exec dbms_workload_repository.drop_snapshot_range(low_snap_id => 628,high_snap_id => 629);

PL/SQL 过程已成功完成。

dba_hist_snapshot视图将列出有关可用快照的信息。

3、创建和删除基线

[sql] view plain copy

[email protected]> exec dbms_workload_repository.create_baseline(start_snap_id => 630,end_snap_id => 635,baseline_name => ‘base line‘);

PL/SQL 过程已成功完成。

[email protected]> select baseline_name,start_snap_id,end_snap_id from dba_hist_baseline;

BASELINE_NAME START_SNAP_ID END_SNAP_ID

---------------------------------------------------------------- ------------- -----------

base line 630 635

SYSTEM_MOVING_WINDOW 636 637

[email protected]> exec dbms_workload_repository.drop_baseline(baseline_name => ‘base line‘,cascade => true);

PL/SQL 过程已成功完成。

[email protected]> select baseline_name,start_snap_id,end_snap_id from dba_hist_baseline;

BASELINE_NAME START_SNAP_ID END_SNAP_ID

---------------------------------------------------------------- ------------- -----------

SYSTEM_MOVING_WINDOW 636 637

[email protected]> exec dbms_workload_repository.create_baseline(to_date(‘2013-11-03 00:00:00‘,‘yyyy-mm-dd hh24:mi:ss‘),to_date(‘2013-11-03 06:00:00‘,‘yyyy-mm-dd hh24:mi:ss‘),‘base line2‘);

PL/SQL 过程已成功完成。

[email protected]> select baseline_name,start_snap_id,end_snap_id from dba_hist_baseline;

BASELINE_NAME START_SNAP_ID END_SNAP_ID

---------------------------------------------------------------- ------------- -----------

base line 685 686

base line2 685 686

SYSTEM_MOVING_WINDOW 640 696

4、自动创建AWR基线

[sql] view plain copy

[email protected]> alter session set NLS_DATE_FORMAT= ‘yyyy-mm-dd hh24:mi:ss‘;

会话已更改。

[email protected]> exec DBMS_WORKLOAD_REPOSITORY.create_baseline_template(

day_of_week => ‘WEDNESDAY‘,

hour_in_day => 0,

duration => 6,

start_time => ‘2013-11-01:00:00:00‘,

end_time => ‘2013-12-31:06:00:00‘,

baseline_name_prefix => ‘Batch Baseline ‘,

template_name => ‘Batch Template‘,

expiration => 365);

PL/SQL 过程已成功完成。

[email protected]> select t.template_name,

t.template_type,

t.start_time,

t.end_time,

t.day_of_week,

t.hour_in_day,

t.duration

from dba_hist_baseline_template t;

TEMPLATE_NAME TEMPLATE_ START_TIME END_TIME DAY_OF_WE HOUR_IN_DAY DURATION

------------------------------ --------- ------------------- ------------------- --------- ----------- ----------

Batch Template REPEATING 2013-11-01 00:00:00 2013-12-31 06:00:00 WEDNESDAY 0 6

[email protected]> exec DBMS_WORKLOAD_REPOSITORY.drop_baseline_template(‘Batch Template‘);

PL/SQL 过程已成功完成。

day_of_week：天或者星期，基线在这个时间上重复。Specify one of the following values:(‘SUNDAY‘, ‘MONDAY‘, ‘TUESDAY‘, ‘WEDNESDAY‘,‘THURSDAY‘, ‘FRIDAY‘, ‘SATURDAY‘, ‘ALL‘)

hour_in_day：0-23，执行基线在这个小时开始。

duration：持续时间(小时数)。

start_time：创建基线的开始时间。

end_time：创建基线的结束时间。

expiration :基线过期的天数。

对于上面这个模板，将会在每周三根据0:00到上午6：00的时间窗口创建固定基线。