V$EVENT_HISTOGRAM_MICRO

V$EVENT_HISTOGRAM_MICRO displays a histogram of the number of waits, the maximum wait, and total wait time on an event basis, in microseconds. The histogram has buckets of time intervals from < 1 us, < 2 us, < 4 us, < 8 us, ... < 2³¹ us, < 2³² us, and >= 2³² us.

The histogram will not be filled unless the TIMED_STATISTICS initialization parameter is set to true.

Column	Datatype	Description
`EVENT#`	`NUMBER`	Event number
`EVENT`	`VARCHAR2(64)`	Name of the event
`WAIT_TIME_FORMAT`	`VARCHAR2(30)`	A human readable time string which is converted from `WAIT_TIME_MICRO`. When `WAIT_TIME_MICRO` < 1 millisecond, `WAIT_TIME_FORMAT` is shown in microseconds. When `WAIT_TIME_MICRO` < 1 second, `WAIT_TIME_FORMAT` is shown in milliseconds. When `WAIT_TIME_MICRO` < 1 minute, `WAIT_TIME_FORMAT` is shown in seconds. When `WAIT_TIME_MICRO` > 1 minute, `WAIT_TIME_FORMAT` is shown in minutes and seconds.
`WAIT_TIME_MICRO`	`NUMBER`	Amount of time the bucket represents (in microseconds). If the duration = `num`, then this column represents waits of duration < `num` that are not included in any smaller bucket.
`WAIT_COUNT`	`NUMBER`	Number of waits of the duration belonging to the bucket of the histogram
`LAST_UPDATE_TIME`	`VARCHAR2(64)`	Indicates the last time the bucket was updated (the ending timestamp of the last wait falling into the bucket's duration)
`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 is available starting with Oracle Database 12c Release 1 (12.1.0.2).