Message-ID: <454AB5D3.30006@linuxlouis.net>
Date: Thu, 02 Nov 2006 22:21:55 -0500
From: louis gonzales <gonzales@linuxlouis.net>
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To: Glen Parker <glenebob@nwlink.com>
CC: pgsql-general@postgresql.org
Subject: Re: Is there anyway to...
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I suppose I'll just concede now :)  Thanks for putting up with my 
sarcasm and humoring my other ideas.  I really wanted to see if there 
were any other methods out there and do appreciate everyone's ideas.

Thanks again,  CRON it is.

Glen Parker wrote:

> Wes Sheldahl wrote:
>
>> if you did have a cron job run to check, you would probably just have 
>> it set a boolean field on expired records or something of that sort, 
>> and run it a little after midnight, at the start of each day, 
>> assuming durations were always being measured in days.
>
>
> Exactly.  You flag when you discover an expired condition, and you 
> flag again when the condition is acted upon.  Easy.  The instructor 
> doesn't need to be bothered any more than you choose.  You could even 
> set a timestamp indicating the last time the instructor was harrassed 
> about it, so you can re-harrass on a daily or weekly basis :-)
>
> Now, my example that had the expire query run when the instructor logs 
> on was just to illustrate that if you do this right, it doesn't matter 
> when the code runs.  Personally, I'd have a cron job do it at 
> midnight, but whenever it runs, even if it's multiple times a day, the 
> outcome should still be correct. That's where your status flags come 
> in.  Once a record has been expired, there's no reason for your expire 
> code to ever look at that record again, right?
>
> -Glen
>
> ---------------------------(end of broadcast)---------------------------
> TIP 6: explain analyze is your friend


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