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Re: OT: Preserving Information

by Abigail-II (Bishop)
on Oct 08, 2002 at 16:43 UTC ( #203689=note: print w/replies, xml ) Need Help??

in reply to Re: Re: OT: Preserving Information
in thread OT: Preserving Information

I don't have a problem with a pure cache - one that will check whether information is stale before serving it. But caches that don't check the backend are a gray area. Personally, I don't have a problem with them, as long as they have a reasonable expiration period (that is, if the backend data is removed or modified, the cache should reflect that after a not-to-long period). But if a cache doesn't expire documents that have disappeared, or where the expire period is unreasonably large I think they are wrong. It might have legal problems as well.


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Re: Re: OT: Preserving Information
by Dog and Pony (Priest) on Oct 09, 2002 at 07:35 UTC
    I don't know how long Google keeps their cache, I can't find that information, but I know that I've upon occassion found sites that were gone (by some time) via their cache instead. Supposedly I guess that the cache would disappear when the site is no longer indexed, ie due to disappearance, but that is a tough one - a site might be down, when do they consider it gone? OTOH, any site owner may request that Google does not cache their site, which is somthing like an opt-out solution then I guess.

    By your definition, I guess theirs is a grey area then.

    You have moved into a dark place.
    It is pitch black. You are likely to be eaten by a grue.

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