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Oracle® Database Reference 10g Release 2 (10.2) Part Number B14237-02 |
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# V$TEMP_HISTOGRAM

`V$TEMP_HISTOGRAM` displays a histogram of all single block reads on a per-tempfile 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