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Oracle® Database Reference
11g Release 2 (11.2)

Part Number E17110-04
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V$STANDBY_EVENT_HISTOGRAM displays the histogram of apply lag on the physical standby. Each distinct value of apply lag has its own bucket and the count in the corresponding bucket represents the number of occurrences so far. The physical standby samples the apply lag every second and increments the corresponding bucket in the histogram.

Column Datatype Description
NAME VARCHAR2(64) Name of the event (currently APPLY LAG is the only valid value)
TIME NUMBER Time duration that the bucket represents
UNIT VARCHAR2(16) Time unit (seconds, minutes, hours, or days)
COUNT NUMBER Count of occurrences falling into this bucket
LAST_TIME_UPDATED VARCHAR2(20) Last time the bucket was updated by an event falling into that time duration