Re: Rows processed by a sql but not retrieved

>
> There is an enhancement request on OTN (as was) asking for at least 2
> numbers on each line of an execution plan

Took me a while to locate it:
https://community.oracle.com/tech/apps-infra/discussion/4386175/a-second-a-row-column-for-input-rows-in-the-traces Everyone: please log in and upvote.

On Tue, Feb 9, 2021 at 9:25 PM Jonathan Lewis <jlewisoracle_at_gmail.com> wrote:

>
> I think the aim of the original question is towards the things Oracle
> doesn't tell us.
>
> Rowsource execution stats, for example, will tell us: "this tablescan
> returned 5000 rows" but they won't tell us "during this tablescan I
> examined 10M rows and discarded all but 5000" - we have to infer some of
> the numbers some other way, and there are some numbers we cannot infer.
>
> There is an enhancement request on OTN (as was) asking for at least 2
> numbers on each line of an execution plan - one for the number of rows
> going into the operation the other for the number coming out - in some
> cases you could infer the number going in from other information, of
> course, but having all components reported on the same line would be
> helpful. At the time I suggested that you could need more than two - on a
> hash join, for example, you have the number of rows used to probe the hash
> table (using the access predicate), the number of rows that find no match,
> the number of rows generated by matching (on the access predicate) and the
> number of rows left after applying the filter predicate. (The number of
> rows used to probe is, of course, the number output from the child
> operation)
>
> Regards
> Jonathan Lewis
>
>
>
>
> On Tue, 9 Feb 2021 at 16:23, Jared Still <jkstill_at_gmail.com> wrote:
>
>> Hello Moustafa,
>>
>> Your question is quite broad in scope, and there are quite a number of
>> things that could be considered.
>>
>> Rather than enumerate all I can think of, I would direct you to
>> v$sqlstats.
>>
>> https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/V-SQLSTATS.html#GUID-495DD17D-6741-433F-871D-C965EB221DA9
>>
>>
>>

-- 
Regards
Timur Akhmadeev

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