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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,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‘,‘base line2‘);
PL/SQL 过程已成功完成。
[email?protected]> select baseline_name,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。
（编辑：李大同）
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