OWI Components(1):V$SYSTEM_EVENT
来源:互联网 发布:开淘宝店教学视频教程 编辑:程序博客网 时间:2024/06/06 16:28
V$EVENT_NAME: 当前数据库已经定义的event的数量;
V$SYSTEM_EVENT: 自动数据库实例启动到现在,oracle所有会话遇到的等待事件的aggregated statistics;
the TOTAL_TIMEOUTS column records the number of times a session failed to get the requested resource after the
initial wait.
The column TIME_WAITED reports the total amount of time spent waiting on the event.
The column AVERAGE_WAIT gives the average time for each wait and is derived from the TOTAL_WAITS and TIME_WAITED
columns.
The V$SYSTEM_EVENT view is a good place to start if you want to perform a quick health check on the database
instance. This quick health check may be helpful when you must diagnose a poorly performing database instance,
especially if you are unfamiliar with it and the application. You will quickly discover the top n bottlenecks
that plague the database instance since startup. However, don’t judge performance or make any tuning decisions
based on these bottlenecks just yet. The information is cumulative since the instance startup.
在查询视图时,我们应该关心的是时间,而不是数量.
V$SYSTEM_EVENT: 自动数据库实例启动到现在,oracle所有会话遇到的等待事件的aggregated statistics;
the TOTAL_TIMEOUTS column records the number of times a session failed to get the requested resource after the
initial wait.
The column TIME_WAITED reports the total amount of time spent waiting on the event.
The column AVERAGE_WAIT gives the average time for each wait and is derived from the TOTAL_WAITS and TIME_WAITED
columns.
The V$SYSTEM_EVENT view is a good place to start if you want to perform a quick health check on the database
instance. This quick health check may be helpful when you must diagnose a poorly performing database instance,
especially if you are unfamiliar with it and the application. You will quickly discover the top n bottlenecks
that plague the database instance since startup. However, don’t judge performance or make any tuning decisions
based on these bottlenecks just yet. The information is cumulative since the instance startup.
在查询视图时,我们应该关心的是时间,而不是数量.
set lines 160set numwidth 18col class for a15col event for a30col total_waits for 999,999,999col total_timeouts for 999,999,999col time_waited for 999,999,999,999col average_wait for 999,999,999,999select a.*, c.startup_time from v$system_event a, v$event_name b, v$instance c where a.event = b.name order by a.time_waited;
- OWI Components(1):V$SYSTEM_EVENT
- Oracle OWI 等待事件视图(v$session_wait/v$session_event/v$system_event)
- [Oracle]OWI等待事件视图(v$session_wait/v$session_event/v$system_event)
- Oracle试图--v$system_event
- 最常用的性能视图——v$system_event、v$session_event(3)!
- V$SYSTEM_EVENT、V$SESSION_EVENT、V$SESSION_WAIT&V$session、V$WAITSTAT
- Oracle V$SYSTEM_EVENT字段等解释
- 性能诊断与调优之OWI--Components
- 通过v$session和v$session_wait_class,v$system_event,v$event_histogram来确定锁等待
- 通过v$session、v$session_wait_class,v$system_event,v$event_histogram来确定锁等待
- 学习动态性能表第18篇--V$SYSTEM_EVENT
- BPT - Business Components v/s Scripted Components
- V$system_event中Wait事件的一段话和resources_wait.sql
- V$system_event中Wait事件的一段话和resources_wait.sql
- 45.Oracle杂记——Oracle常用动态视图v$system_event
- OWI监控和收集方法——将database logoff trigger用作数据收集器(1)
- 性能调优基础--OWI学习笔记(一)
- owi介绍
- 关于C语言中函数调用和参数传递机制的探讨(一 .无参数传递)
- 关于Server.MapPath()
- Android布局控件之LinearLayout详解
- PHP 中 GPC的思考:$_REQUEST、$_GET、$_POST、$_COOKIE 的关系和区别
- 二叉树的创建与遍历
- OWI Components(1):V$SYSTEM_EVENT
- 使用View绘画简单的图形
- fill_parent和wrap_content的区别
- linux内核分析之进程地址空间
- vnc 启动运行
- java反射_01
- hibernate缓存机制的理解
- android Activity的生命周期于四种加载状态
- HWI WAR file not found问题