AWR
1 Oracle AWR 介绍 Oracle Database 10g 提供了一个显著改进的工具：自动工作负载信息库 (AWR:Automatic Workload Repository)。 Oracle 建议用户用这个取代 Statspack。AWR 实质上是一个 Oracle 的内置工具，它采集与性能相关的统计数据， 并从那些统计数据
1 Oracle AWR 介绍
Oracle Database 10g 提供了一个显著改进的工具：自动工作负载信息库 (AWR:Automatic Workload Repository)。
Oracle 建议用户用这个取代 Statspack。AWR 实质上是一个 Oracle 的内置工具，它采集与性能相关的统计数据，
并从那些统计数据中导出性能量度，以跟踪潜在的问题。与 Statspack 不同，快照由一个称为 MMON 的新的后台进程及其从
进程自动地每小时采集一次。为了节省空间，采集的数据在 7 天后自动清除。快照频率和保留时间都可以由用户修改。
它产生两种类型的输出：文本格式（类似于 Statspack 报表的文本格式但来自于 AWR 信息库）和默认的 HTML 格式
（拥有到部分和子部分的所有超链接），从而提供了非常用户友好的报表。
2 AWR的使用
SQL> @/oracle/app/product/11g/db/rdbms/admin/awrrpt.sql
awrrpt.sql ：生成指定快照区间的统计报表；
awrrpti.sql ：生成指定数据库实例，并且指定快照区间的统计报表；
awrsqlrpt.sql ：生成指定快照区间，指定SQL语句(实际指定的是该语句的SQLID)的统计报表；
awrsqrpi.sql ：生成指定数据库实例，指定快照区间的指定SQL语句的统计报表；
awrddrpt.sql ：指定两个不同的时间周期，生成这两个周期的统计对比报表；
awrddrpi.sql ：指定数据库实例，并指定两个的不同时间周期，生成这两个周期的统计对比报表；
AWR报告
生成当前时间的awr快照:
begin
dbms_workload_repository.create_snapshot();
end;
/
先查awr快照:
select snap_id,begin_interval_time,end_interval_time from dba_hist_snapshot order by 1;
生成报告:
@/oracle/app/product/11g/db/rdbms/admin/awrrpt.sql
@$ORACLE_HOME/rdbms/admin/addmrpt.sql
@$ORACLE_HOME/rdbms/admin/ashrpt.sql
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