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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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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)
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