Skip Headers
Oracle® Database Reference
11g Release 2 (11.2)

Part Number E10820-03
Go to Documentation Home
Home
Go to Book List
Book List
Go to Table of Contents
Contents
Go to Index
Index
Go to Master Index
Master Index
Go to Feedback page
Contact Us

Go to previous page
Previous
Go to next page
Next
View PDF

V$FILE_HISTOGRAM

V$FILE_HISTOGRAM displays a histogram of all synchronous single block reads on a per-file basis (for data files). The histogram has buckets of time intervals from < 1 ms, < 2 ms, < 4 ms, < 8 ms, ... < 221 ms, < 222 ms, and >= 222 ms.

The histogram will not be filled unless the STATISTICS_LEVEL initialization parameter is set to ALL.

Column Datatype Description
FILE# NUMBER File number
SINGLEBLKRDTIM_MILLI NUMBER Amount of time the bucket represents (in milliseconds). If the duration = num, then this column represents waits of duration < num that are not included in any smaller bucket.
SINGLEBLKRDS NUMBER Number of waits of the duration belonging to the bucket of the histogram