[Oracle] - 性能优化工具（1） - AWR

AWR快照

默认情况下，Oracle每隔一小时会自己主动产生一个快照，保存近期8天的快照。

我们能够通过例如以下语句获得产生快照的时间间隔和保存的天数：

SYS@orcl(lx15)> select SNAP_INTERVAL,RETENTION from dba_hist_wr_control;

SNAP_INTERVAL                                                               RETENTION
--------------------------------------------------------------------------- ---------------------------------------------------------------------------
+00000 01:00:00.0                                                           +00008 00:00:00.0

exec dbms_workload_repository.modify_snapshot_settings(interval => 30, retention = > 10*24*60);

exec dbms_workload_repository.create_snapshot;

AWR报告生成

@?/rdbms/admin/awrrpt.sql

set pagesize 0
set linesize 121
spool d:\awr_commit_frequently.html

select output from table(dbms_workload_repository.awr_report_html(977587123,1,1920,1921));
spool off


注：
DBMS_WORKLOAD_REPOSITORY.AWR_REPORT_HTML(
   l_dbid       IN    NUMBER,
   l_inst_num   IN    NUMBER,
   l_bid        IN    NUMBER,
   l_eid        IN    NUMBER,
   l_options    IN    NUMBER DEFAULT 0)
 RETURN awrrpt_text_type_table PIPELINED;