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Oracle 视图 DBA_HIST_BG_EVENT_SUMMARY 官方解释,作用,如何使用详细说明

本站中文解释

(ORACLE11G以上 )

Oracle视图DBA_HIST_BG_EVENT_SUMMARY用于查看背景进程运行事件的历史汇总数据,包括活动事件名称、活动事件ID、开始时间、结束时间、状态和同事件ID次数等等,可以用来分析系统在每一时刻背景进程的活动。

这个视图的使用方法就和使用其它的视图一样,通过select语句即可查看它的内容,如: select * from DBA_HIST_BG_EVENT_SUMMARY; 当然,你也可以根据自己的需求,使用这个视图提供的关键字如event_name,event_id,start_time,end_time,status,occurences等,并用其与其他视图关联,查看需要的相关信息。

官方英文解释

DBA_HIST_BG_EVENT_SUMMARY displays the historical summary background event activity.

This view contains snapshots from V$SESSION_EVENT.

Column Datatype NULL Description

SNAP_ID

NUMBER

NOT NULL

Unique snapshot ID

DBID

NUMBER

NOT NULL

Database ID for the snapshot

INSTANCE_NUMBER

NUMBER

NOT NULL

Instance number for the snapshot

EVENT_ID

NUMBER

NOT NULL

Identifier of the wait event

EVENT_NAME

VARCHAR2(64)

NOT NULL

Name of the wait event

WAIT_CLASS_ID

NUMBER

Identifier of the class of the wait event

WAIT_CLASS

VARCHAR2(64)

Name of the class of the wait event

TOTAL_WAITS

NUMBER

Total number of waits for the event

TOTAL_TIMEOUTS

NUMBER

Total number of timeouts for the event

TIME_WAITED_MICRO

NUMBER

Total amount of time waited for the event (in microseconds)

CON_DBID

NUMBER

The database ID of the PDB for the sampled session

CON_ID

NUMBER

The ID of the container that CON_DBID identifies. 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

See Also:

“V$SESSION_EVENT”

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