[LEAPSECS] Coming of age in the solar system

[Tony Finch]

On 4 Sep 2010, at 22:05, Paul Sheer <p at 2038bug.com> wrote:

> 

> Databases have extremely sophisticated time handling functions.

> It's a "solved problem" and it's not a space you ever want to

> try compete in.


This reminds me of 2008-12-31 23:59:60 Z when a lot of Oracle systems crashed or rebooted because the Solaris clock went backwards.

http://www.gossamer-threads.com/lists/nanog/users/110935

Tony.
--
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/



> 

> 

>> Do I need to remind you about the 3rd rule of software development:

>> 

>>   3. The only thing worse than generalizing from one example

>>      is generalizing from no examples at all.

>> 

> 

> how about generalizing from two examples as you have given :-)

> 

> 

>> No, I said exactly what I said:  Very few of the leap second

>> induced anomalies gets recognized for what they are, fewer still

>> gets reported as such and since nobody thinks there is anything

>> that can be done about it, the reports gather dust.

>> 

> 

> but you know about these reports because... you are psychic?

> 

> 

>> To that I can add, that a lot of organizations have special

>> operational status across leap-seconds.  Basically they give

>> up trying to handle it correctly, and simply shut down/idle

>> their operation in a window around the leap second.

>> 

>> One example: Medicine production.

>> 

>> FDA and EU requires lot-tracking to the second.  It is cheaper to

>> not transfer any substances for a window of N minutes around the

>> leap second, thus avoiding any timestamps during the leapsecond,

>> than it is to qualify that all kit will do the leap second correctly.

> 

> sounds like UTC-SLS solves this problem - no?

> 

> 

>> 

>> I know several facilities of various kinds I which schedule their

>> yearly maintenance during leap-seconds, or shut down extraordinarily.

>> 

> 

> let's discuss these then. URL please?

> 

> 

> -paul

> 

> 

> 

> 

> 

> 

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