从awr中获取scn变化趋势的另外一个脚本--来自www.oracledatabase12g.com

最新推荐文章于 2025-12-02 20:26:41 发布

转载最新推荐文章于 2025-12-02 20:26:41 发布 · 2k 阅读

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#oracle #scn headroom

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本文提供了一个从AWR(Automatic Workload Repository)获取SCN(System Change Number)变化趋势的SQL脚本。该脚本通过比较不同时间点的SCN值来计算每秒的变化速率，有助于监测数据库活动强度。

从awr中获取scn变化趋势的另外一个脚本--来自www.oracledatabase12g.com
本文转帖自：
http://www.oracledatabase12g.com/archives/tag/scn-headroom

alter session set nls_date_format='dd-mon-yy';
set lines 160 pages 1000 echo off feedback off
col stat_name for a25
col date_time for a40
col BEGIN_INTERVAL_TIME for a20
col END_INTERVAL_TIME for a20
prompt "Enter the date in DD-Mon-YY Format and Stats you want to trend like 'redo size','physical reads','physical writes','session logical reads' etc."


WITH sysstat AS
 (select sn.begin_interval_time begin_interval_time,
         sn.end_interval_time end_interval_time,
         ss.stat_name stat_name,
         ss.value e_value,
         lag(ss.value, 1) over(order by ss.snap_id) b_value
    from dba_hist_sysstat ss, dba_hist_snapshot sn
   where  ss.snap_id = sn.snap_id
     and ss.dbid = sn.dbid
     and ss.instance_number = sn.instance_number
     and ss.dbid = (select dbid from v$database)
     and ss.instance_number = (select instance_number from v$instance)
     and ss.stat_name = 'calls to kcmgas')
select to_char(BEGIN_INTERVAL_TIME, 'mm/dd/yy_hh24_mi') || to_char(END_INTERVAL_TIME, '_hh24_mi') date_time,
stat_name,
round((e_value - nvl(b_value,0)) / (extract(day from(end_interval_time - begin_interval_time)) * 24 * 60 * 60
+ extract(hour from(end_interval_time - begin_interval_time)) * 60 * 60
+ extract(minute from(end_interval_time - begin_interval_time)) * 60 + extract(second from(end_interval_time - begin_interval_time))),0) per_sec
from sysstat where(e_value - nvl(b_value,0)) > 0 and nvl(b_value,0) > 0
/