7.135 V$CON_EVENT_HISTOGRAM_MICRO

V$CON_EVENT_HISTOGRAM_MICRO displays a histogram of the number of waits, the maximum wait, and total wait time on an event basis for a container, 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(73)

Indicates the last time the bucket was updated (the ending timestamp of the last wait falling into the bucket's duration)

CON_ID

NUMBER

When queried from a non-CDB, the wait event data in that instance are returned, and the CON_ID value is 0.

When queried from the root of a CDB, the wait event data in every container is returned, and the CON_ID value indicates the container to which the wait event data belong.

When queried from a PDB, wait event data in that PDB are returned, and the CON_ID value is the container ID for that PDB.