Re: Autonomous Transaction Sequencing

Do you see anything in background trace files about "time drift"? Is the environment real or virtual ? I do see odd timing anomalies occasionally on an OVM Linux running as a guest on a multi CPU windows machine. Can you modify the code to capture current SCN as well?

Regards
Jonathan Lewis
(From my iPad mini; please excuse typos and auto-correct)

> On 13 Jan 2018, at 08:01, Stefan Knecht <knecht.stefan_at_gmail.com> wrote:
>
> Hi all
>
> If you have a code structure similar to this:
>
> begin
> procedure set_start
> is
> pragma autonomous_transaction;
> begin
> update t set start_time=systimestamp;
> commit;
> end;
> procedure set_end
> is
> pragma autonomous_transaction;
> begin
> update t set end_time=systimestamp;
> commit;
> end;
> begin
> set_start;
> -- run some code here that takes anywhere between 0.1 and 2 seconds to complete
> commit;
> set_end;
> end;
> /
>
> I have some executions of this code, 40 out of 6000 runs, where I end up with the end_time being a timestamp BEFORE the begin_time and not just a microsecond or two. 0.4 seconds, 0.6 seconds. A significant amount of time.
>
> This leads me to believe that Oracle somehow fires autonomous transactions asynchronously or out of order of the code structure?
>
> Before I go off on a digging spree - has anyone seen this before or has an explanation?
>
> Oracle 12.1 on *nix.
>
> Cheers
>
> Stefan
>
>
>
>
> --
> //
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