Oracle教程 2023-02-24

Oracle 视图 V$SYSTEM_EVENT 官方解释，作用，如何使用详细说明

本站中文解释

Oracle视图V$SYSTEM_EVENT主要用于查看系统进行事件监控，它可显示对系统当前事件的总体状况，包括服务请求，等待资源，延迟重试以及相关事件的当前状态。

可以使用以下语句来查看V$SYSTEM_EVENT的视图：

SELECT * FROM V$SYSTEM_EVENT;

这个视图可以用来检查服务器的等待事件，并识别与系统性能相关的问题。如果某些等待事件的事件名消耗的时间很多，则可以代表服务器的瓶颈，此时应该采取措施来优化性能，以提高服务器的性能。

官方英文解释

V$SYSTEM_EVENT displays information on total waits for an event. 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
`EVENT`	`VARCHAR2(64)`	Name of the wait event; derived statistic name from `V$EVENT_NAME` See Also: “Oracle Wait Events”
`TOTAL_WAITS`	`NUMBER`	Total number of waits for the event
`TOTAL_TIMEOUTS`	`NUMBER`	Total number of timeouts for the event
`TIME_WAITED`	`NUMBER`	Total amount of time waited for the event (in hundredths of a second)
`AVERAGE_WAIT`	`NUMBER`	Average amount of time waited for the event (in hundredths of a second)
`TIME_WAITED_MICRO`	`NUMBER`	Total amount of time waited for the event (in microseconds)
`CPU`	`NUMBER`	Total amount of CPU time consumed while implementing the wait event itself (in microseconds)
`TOTAL_WAITS_FG`	`NUMBER`	Total number of waits for the event, from foreground sessions
`TOTAL_TIMEOUTS_FG`	`NUMBER`	Total number of timeouts for the event, from foreground sessions
`TIME_WAITED_FG`	`NUMBER`	Total amount of time waited for the event, from foreground sessions (in hundredths of a second)
`AVERAGE_WAIT_FG`	`NUMBER`	Average amount of time waited for the event, from foreground sessions (in hundredths of a second)
`TIME_WAITED_MICRO_FG`	`NUMBER`	Total amount of time waited for the event, from foreground sessions (in microseconds)
`CPU_FG`	`NUMBER`	Total amount of CPU time consumed while implementing the wait event itself, from foreground sessions (in microseconds)
`EVENT_ID`	`NUMBER`	Identifier of the wait event
`WAIT_CLASS_ID`	`NUMBER`	Identifier of the wait class of the wait event
`WAIT_CLASS#`	`NUMBER`	Number of the wait class of the wait event
`WAIT_CLASS`	`VARCHAR2(64)`	Name of the wait class of the wait event
`CON_ID`	`NUMBER`	The ID of the container to which the data pertains. Possible values include: `0`: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. `1`: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data

Note:

This view returns instance-wide data and a value of 0 in the CON_ID column when queried from the root of a CDB.

数据运维技术 » Oracle 视图 V$SYSTEM_EVENT 官方解释，作用，如何使用详细说明

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