| Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 |
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View PDF |
| Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 |
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|
View PDF |
V$FILE_HISTOGRAM displays a histogram of all single block reads on a per-file basis. The histogram has buckets of time intervals from < 1 ms, < 2 ms, < 4 ms, < 8 ms, ... < 2^21 ms, < 2^22 ms, >= 2^22 ms.
The histogram will not be filled unless the TIMED_STATISTICS initialization parameter is set to true.
| 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 |
