创建AWR报告
默认快照间隔1小时，10g保存7天、11g保存8天; 可以通过DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS修改
DBA_HIST_WR_CONTROL
AWR程序核心是dbms_workload_repository包
@?/rdbms/admin/awrrpt 本实例
@?/rdbms/admin/awrrpti RAC中选择实例号
手动执行一个快照：
Exec dbms_workload_repository.create_snapshot; (这个要背出来哦，用的时候去翻手册，丢脸哦 !)
创建一个AWR基线
Exec DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE(start_snap_id，end_snap_id ,baseline_name);
@?/rdbms/admin/awrddrpt AWR比对报告
@?/rdbms/admin/awrgrpt RAC 全局AWR
创建AWR
SQL>@?/rdbms/admin/awrrpt.sql
Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
Would you like an HTML report, or a plain text report?
Enter 'html' for an HTML report, or 'text' for plain text
Defaults to 'html'
输入 report_type 的值:
Type Specified: html
Specify the number of days of snapshots to choose from
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Entering the number of days (n) will result in the most recent
(n) days of snapshots being listed. Pressing <return> without
specifying a number lists all completed snapshots.
输入 num_days 的值: 1
Listing the last day's Completed Snapshots
Snap
Instance DB Name Snap Id Snap Started Level
------------ ------------ --------- ------------------ -----
orcl10g ORCL10G 12 03 7月 2012 08:11 1
16 03 7月 2012 09:00 1
Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
输入 begin_snap 的值: 142
Begin Snapshot Id specified: 142
输入 end_snap 的值: 146
End Snapshot Id specified: 146
Specify the Report Name
~~~~~~~~~~~~~~~~~~~~~~~
The default report file name is awrrpt_1_12_16.html. To use this name,
press <return> to continue, otherwise enter an alternative.
输入 report_name 的值: D:/awrrpt_1_12_16.html
Report written to D:/awrrpt_1_12_16.html
二. AWR 操作
2.1. 查看当前的AWR保存策略
SQL> col SNAP_INTERVAL format a20
SQL> col RETENTION format a20
SQL> select * from dba_hist_wr_control;
DBID SNAP_INTERVAL RETENTION TOPNSQL
---------- -------------------- -------------------- ----------
262089084 +00000 01:00:00.0 +00007 00:00:00.0 DEFAULT
以上结果表示,每小时产生一个SNAPSHOT，保留7天。
2.2. 调整AWR配置
AWR配置都是通过dbms_workload_repository包进行配置。
2.2.1 调整AWR产生snapshot的频率和保留策略，如将收集间隔时间改为30 分钟一次。并且保留5天时间（单位都是分钟）：
SQL> exec dbms_workload_repository.modify_snapshot_settings(interval=>30, retention=>5*24*60);
2.2.2 关闭AWR，把interval设为0则关闭自动捕捉快照
SQL> exec dbms_workload_repository.modify_snapshot_settings(interval=>0);
2.2.3 手工创建一个快照
SQL> exec DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();
2.2.4 查看快照
SQL> select * from sys.wrh$_active_session_history
2.2.5 手工删除指定范围的快照
SQL> exec DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE(low_snap_id => 973, high_snap_id => 999, dbid => 262089084);
2.2.6 创建baseline，保存这些数据用于将来分析和比较
SQL> exec dbms_workload_repository.create_baseline(start_snap_id => 1003, end_snap_id => 1013, 'apply_interest_1');
2.2.7 删除baseline
SQL> exec DBMS_WORKLOAD_REPOSITORY.DROP_BASELINE(baseline_name => 'apply_interest_1', cascade => FALSE);
2.2.8 将AWR数据导出并迁移到其它数据库以便于以后分析
SQL> exec DBMS_SWRF_INTERNAL.AWR_EXTRACT(dmpfile => 'awr_data.dmp', mpdir => 'DIR_BDUMP', bid => 1003, eid => 1013);
2.2.9 迁移AWR数据文件到其他数据库
SQL> exec DBMS_SWRF_INTERNAL.AWR_LOAD(SCHNAME => 'AWR_TEST', dmpfile => 'awr_data.dmp', dmpdir => 'DIR_BDUMP');
把AWR数据转移到SYS模式中：
SQL> exec DBMS_SWRF_INTERNAL.MOVE_TO_AWR (SCHNAME => 'TEST');