awr常用技巧

awr保留10天，每小時(shí)收集一次：
begin DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(14400,60); end;
手動(dòng)收集awr一次：
exec DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();

手動(dòng)執(zhí)行一個(gè)快照：
Exec dbms_workload_repository.create_snapshot; (這個(gè)要背出來哦，用的時(shí)候去翻手冊，丟臉哦)

創(chuàng)建一個(gè)AWR基線

Exec DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE(start_snap_id，end_snap_id ,baseline_name);
@?/rdbms/admin/awrrpt 生成AWR報(bào)告
@?/rdbms/admin/awrddrpt AWR比對報(bào)告

@?/rdbms/admin/awrgrpt RAC 全局AWR

dbms_workload_repository手工管理AWR
1、修改快照設(shè)置

[sql] view plaincopyprint?
查看awr保留的天數(shù)和采集頻率：
sys@ORCL> select * from dba_hist_wr_control;

      DBID SNAP_INTERVAL             RETENTION                      TOPNSQL  
---------- ------------------------- ------------------------------ ----------  
1301772781 +00000 01:00:00.0         +00008 00:00:00.0              DEFAULT  

修改awr保留的天數(shù)和采集頻率：
sys@ORCL> exec dbms_workload_repository.modify_snapshot_settings(retention => 15*1440,interval => 30);

PL/SQL 過程已成功完成。  

sys@ORCL> select * from dba_hist_wr_control;  

      DBID SNAP_INTERVAL             RETENTION                      TOPNSQL  
---------- ------------------------- ------------------------------ ----------  
1301772781 +00000 00:30:00.0         +00015 00:00:00.0              DEFAULT  

interval：將間隔設(shè)置為0時(shí)，oracle將禁止采用自動(dòng)和手工快照的機(jī)制。
retention：當(dāng)保存時(shí)間設(shè)置為0時(shí)，oracle將永久地保存這個(gè)快照。

2、創(chuàng)建和刪除快照

[sql] view plaincopyprint?
手動(dòng)執(zhí)行一個(gè)awr快照：
sys@ORCL> exec dbms_workload_repository.create_snapshot();

PL/SQL 過程已成功完成。  

刪除awr報(bào)告（指定刪除范圍）：
sys@ORCL> exec dbms_workload_repository.drop_snapshot_range(low_snap_id => 10,high_snap_id => 12);

PL/SQL 過程已成功完成。  

sys@ORCL> exec dbms_workload_repository.drop_snapshot_range(low_snap_id => 628,high_snap_id => 629);  

PL/SQL 過程已成功完成。  

dba_hist_snapshot視圖將列出有關(guān)可用快照的信息。
SELECT * FROM dba_hist_snapshot

3、創(chuàng)建和刪除基線

[sql] view plaincopyprint?

sys@ORCL> exec dbms_workload_repository.create_baseline(start_snap_id => 630,end_snap_id => 635,baseline_name => 'base line');  

PL/SQL 過程已成功完成。  

sys@ORCL> 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  

sys@ORCL> exec dbms_workload_repository.drop_baseline(baseline_name => 'base line',cascade => true);  

PL/SQL 過程已成功完成。  

sys@ORCL> 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  

sys@ORCL> exec dbms_workload_repository.create_baseline(to_date('2013-11-03 00:00:00','yyyy-mm-dd hh34:mi:ss'),to_date('2013-11-03 06:00:00','yyyy-mm-dd hh34:mi:ss'),'base line2');  

PL/SQL 過程已成功完成。  

sys@ORCL> 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、自動(dòng)創(chuàng)建AWR基線

[sql] view plaincopyprint?

sys@ORCL> alter session set NLS_DATE_FORMAT= 'yyyy-mm-dd hh34:mi:ss';  

會(huì)話已更改。  

sys@ORCL> 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 過程已成功完成。  

sys@ORCL> select t.template_name,  
  2         t.template_type,  
  3         t.start_time,  
  4         t.end_time,  
  5         t.day_of_week,  
  6         t.hour_in_day,  
  7         t.duration  
  8    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  

sys@ORCL> exec DBMS_WORKLOAD_REPOSITORY.drop_baseline_template('Batch Template');  

PL/SQL 過程已成功完成。  

day_of_week：天或者星期，基線在這個(gè)時(shí)間上重復(fù)。Specify one of the following values:('SUNDAY', 'MONDAY', 'TUESDAY', 'WEDNESDAY','THURSDAY', 'FRIDAY', 'SATURDAY', 'ALL')
hour_in_day：0-23，執(zhí)行基線在這個(gè)小時(shí)開始。
duration：持續(xù)時(shí)間(小時(shí)數(shù))。
start_time：創(chuàng)建基線的開始時(shí)間。
end_time：創(chuàng)建基線的結(jié)束時(shí)間。
expiration :基線過期的天數(shù)。

對于上面這個(gè)模板，將會(huì)在每周三根據(jù)0:00到上午6：00的時(shí)間窗口創(chuàng)建固定基線。