V$REQDIST lists statistics for the histogram of shared server dispatcher request times, divided into 12 buckets, or ranges of time. The time ranges grow exponentially as a function of the bucket number.

Column Datatype Description
BUCKET NUMBER Bucket number: 0 - 11; the maximum time for each bucket is (4 * 2^N)/100 seconds
COUNT NUMBER Count of requests whose total time to complete (excluding wait time) falls in this range