Re: Source for tim=nnnnn in 10046 trace
- From: Yong Huang <yong321@xxxxxxxxx>
- To: De DBA <dedba@xxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 26 Aug 2013 19:04:37 -0700 (PDT)
Tony,
I thought about that. But at the end of December or beginning of January, it's
not summer. So DST won't be in effect.
I also thought about when the US started it. According to
http://en.wikipedia.org/wiki/Daylight_saving_time
"It became widely adopted, particularly in North America and Europe starting in
the 1970s as a result of the 1970s energy crisis."
It didn't say exactly when. But the beginning of 1970 is barely in the 1970s.
But of course the epoch time could be put back retrospectively, and when they
did it, it happened to be in a summer.
Yong Huang
________________________________
From: De DBA <dedba@xxxxxxxxxx>
To: oracle-l@xxxxxxxxxxxxx; yong321@xxxxxxxxx
Sent: Monday, August 26, 2013 8:47 PM
Subject: Re: Source for tim=nnnnn in 10046 trace
the 4 hours time difference also occurs in the UTC-5 zone (New York, Detroit,
Miami) when Daylight Savings Time is in force.
Cheers,
Tony
On 27/08/13 00:54, Yong Huang wrote:
> One addition to what I posted earlier (shown below). The derived_sysdate in
> the query is 1969-12-31 19:59:59, i.e. 8pm instead of 23:59:59 of that night
> (or 12am of 1970-01-01). The 4 hour difference may be due to different
> timezones. According to
> http://www.timeanddate.com/worldclock/converted.html?iso700101T00&p1=0&p29&p3#&p4(3&p5(6
>
> 8pm of 1969-12-31 at UTC epoch is the time for the timezone where Nova
> Scotia, Canada is. I'm not sure why.
>
> Yong Huang
>
> My previous message:
>
>
> You just need to change your sysdate to 2013-08-23 15:24:25.823. For example:
>
> SQL> with x as (select 1377285865823053 as t, (1377285865823053/1e6) as t1
> from dual)
> 2 select t tim_micro, t1 tim_sec, '2013-08-23 15:24:25' curr_sysdate,
>to_date('2013-08-23 15:24:25','yyyy-mm-dd hh24:mi:ss')-(t1/86400)
> 3 derived_sysdate
> 4 from x;
>
> TIM_MICRO TIM_SEC CURR_SYSDATE DERIVED_SYSDATE
> -------------------- -------------------- -------------------
> -------------------
> 1377285865823053 1377285865.823053 2013-08-23 15:24:25 1969-12-31
>19:59:59
>
> The derived sysdate is the epoch.
> --
> //www.freelists.org/webpage/oracle-l
>
>
>
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