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Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 |
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# DBA_HIST_BG_EVENT_SUMMARY

`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)