Oracle 视图 V$CON_SYSTEM_EVENT 官方解释，作用，如何使用详细说明
本站中文解释
Oracle的V$CON_SYSTEM_EVENT视图就是系统中定义的所有活动和事件的一个列表，它用来记录系统事件，可用于确定特定事件发生的频率、等待时间以及相关的进程信息。
使用V$CON_SYSTEM_EVENT视图主要分为以下几步：
1、启动dbca，进入数据库资源管理器，在菜单中选择“系统视图”；
2、在系统视图中找到V$CON_SYSTEM_EVENT，然后“双击”进入；
3、利用sql语句查看系统中定义的所有活动和事件，如：
SELECT * FROM V$CON_SYSTEM_EVENT;
4、通过查或改sql语句可以设置活动和事件的时间，如：
UPDATE V$CON_SYSTEM_EVENT com set com.wait_time =60 where com.event_name=’DBWR_UPDATE_BUFFER_CACHE’;
以上就是Oracle的V$CON_SYSTEM_EVENT视图的使用方法。
官方英文解释
V$CON_SYSTEM_EVENT displays information on total waits for an event in a container.
Note that the TIME_WAITED and AVERAGE_WAIT columns will contain a value of zero on those platforms that do not support a fast timing mechanism. If you are running on one of these platforms and you want this column to reflect true wait times, then you must set TIMED_STATISTICS to TRUE in the parameter file; doing this will have a small negative effect on system performance.
See Also:
“TIMED_STATISTICS”
| Column | Datatype | Description |
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Name of the wait event; derived statistic name from See Also: “Oracle Wait Events” |
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Total number of waits for the event |
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Total number of timeouts for the event |
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Total amount of time waited for the event (in hundredths of a second) |
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Average amount of time waited for the event (in hundredths of a second) |
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Total amount of time waited for the event (in microseconds) |
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Total amount of CPU time consumed while implementing the wait event itself (in microseconds) |
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Total number of waits for the event, from foreground sessions |
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Total number of timeouts for the event, from foreground sessions |
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Total amount of time waited for the event, from foreground sessions (in hundredths of a second) |
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Average amount of time waited for the event, from foreground sessions (in hundredths of a second) |
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Total amount of time waited for the event, from foreground sessions (in microseconds) |
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Total amount of CPU time consumed while implementing the wait event itself, from foreground sessions (in microseconds) |
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Identifier of the wait event |
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Identifier of the wait class of the wait event |
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Number of the wait class of the wait event |
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Name of the wait class of the wait event |
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When queried from a non-CDB, the wait event data in that instance are returned, and the When queried from the root of a CDB, the wait event data in every container is returned, and the When queried from a PDB, wait event data in that PDB are returned, and the |
