[Seaside] saving an image while serving

[Boris Popov, DeepCove Labs]

We're also forgetting to discuss the kind of data one is trying to store. Losing one hour's worth of blog updates isn't the same as losing one hour's worth of transactions through a payment processor, which even at 10 TPS is 36,000 transactions. These kinds of decisions can't be made on a mailing list simply using someone else's, likely incomparable and incompatible, past experience.

-Boris

-----Original Message-----
From: seaside-bounces at lists.squeakfoundation.org [mailto:seaside-bounces at lists.squeakfoundation.org] On Behalf Of Philippe Marschall
Sent: 18 April 2011 08:01
To: Seaside - general discussion
Subject: Re: [Seaside] saving an image while serving

2011/4/18 Janko Mivšek <janko.mivsek at eranova.si>:
> Hi guys,
>
> Let me support Nevin claims strongly with my the same experiences with 
> image based persistency. Anyone just enough pragmatic and with a bit 
> of probability calculus can soon discover, how right Nevin is.
>
> I know that from my experience, ok, with VisualWorks images, which 
> snapshot every hour. One such sole image hosts 50+ sites and in last 8 
> years without any loss of data. We have just few crashes (around 2-4 
> per
> year) because of DOS attacks, and that's all.
>
> It is true that there is 1 hour window to loose data and that we had 
> luck loosing nothing during those few (mostly nightly) crashes, but 
> when I compare that with horror stories of friends using, say MySql...
>
> Of course such image is backup every hour, every night - just plain 
> usual safety measures therefore.

Everyone how thinks image based persistence is a good idea please look at SqueakSource. Not only do you suffer from the impacts of the non-transactional behavior (yes, data got lost several times in the past, the image hangs for quite some time when saving) you'll also never be able to switch to a new version of your dialect and you are limited to one image doing the processing.

Cheers
Philippe
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