Can I create multi hash table?

[Mingqi Shao]

Steven, thank you for the answer. I think I have comprehended.
I hava another question. I don't find more detail document about memcached,
so I want to know what is the difference of set and replace command?
Can you  share some document of memcache with me? thanks.


ÔÚ06-9-27£¬Steven Grimm <sgrimm at facebook.com> дµÀ£º
>
>  You have a couple options. If flushing all person data is a very
> infrequent operation, you can do a "flush_all" command, which will flush the
> entire cache, including all your product data. That's by far the most
> efficient (on the memcached side, anyway) but obviously it means your
> application will have to repopulate the whole cache, not just the person
> data.
>
> Alternately, if you need to flush all your person data often, you can add
> another prefix or suffix to your keys: a version number. When you want to
> flush the person data, just increase the version number you append to all
> your person keys. The old values will still be in the cache, but you will
> never look them up and they will eventually fall out of the cache because of
> the LRU algorithm.
>
> There is no way to perform bulk operations on a subset of the values in
> the cache.
>
> If you tell us a little more about why you want to flush your person data,
> one of us can probably offer some alternate approaches. Assuming, that is,
> that one of the two suggestions above isn't suitable for you.
>
> -Steve
>
>
> Mingqi Shao wrote:
>
> In pre-example, if I want to remove all persion data  from memcached, what
> shoule I to?
> I don't will run a separate memcached process for each object type.
> thanks.
>
> 2006/9/27, Steven Grimm < sgrimm at facebook.com>:
> >
> > ¿É ÒÔ¡£You can get the same effect by just putting a prefix in front of
> > the IDs. So instead of a key of "foo" for a product, you'd use
> > "product:foo". We do this very successfully with a large number of
> > different object types.
> >
> > If you can't do that, then you can also run multiple memcached instances
> >
> > and fetch different object types from each instance. We actually do a
> > bit of that as well; we modified our client code to look at the key and
> > choose from separate lists of servers for certain object types.
> > (Unfortunately due to some licensing ambiguities in the code we
> > modified, we can't release those changes.)
> >
> > -Steve
> >
> >
> > ÉÛÃ÷᪠wrote:
> > > For example, I want to cache person and product information in
> > > memcached. Their key both are a identify of string type. Can I create
> > > separate hash table for they in order to avoid a identify of a person
> > > and a product are equivalent? thanks.
> >
> >
>
>
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