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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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DBA_HIST_WAITCLASSMET_HISTORY

DBA_HIST_WAITCLASSMET_HISTORY displays the history of the wait event class metric data kept by the Workload Repository.

Column Datatype NULL Description
SNAP_ID NUMBER NOT NULL Unique snapshot ID
DBID NUMBER NOT NULL Database ID of the snapshot
INSTANCE_NUMBER NUMBER NOT NULL Instance number of the snapshot
WAIT_CLASS_ID NUMBER NOT NULL Identifier of the class of the wait event
WAIT_CLASS VARCHAR2(64)   Name of the class of the wait event
BEGIN_TIME DATE NOT NULL Begin time of the interval
END_TIME DATE NOT NULL End time of the interval
INTSIZE NUMBER NOT NULL Interval size (in hundredths of a second)
GROUP_ID NUMBER NOT NULL Metric group ID
AVERAGE_WAITER_COUNT NUMBER NOT NULL Average waiter count
DBTIME_IN_WAIT NUMBER NOT NULL Percent of database time spent in the wait
TIME_WAITED NUMBER NOT NULL Time waited during the interval (in microseconds)
WAIT_COUNT NUMBER NOT NULL Number of times waited
TIME_WAITED_FG NUMBER   Time waited (in hundredths of a second), from foreground sessions
WAIT_COUNT_FG NUMBER   Number of times waited, from foreground sessions
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