FW: Can I create multi hash table?

[NTPT]

Adding perfix or suffix to your keys   and not flush but wait for LRU to remove invalid keys is a brillant idea , it allow simulate 2 (may be n ) dimensional caches, but you need to store perfixes for identifiers (i do not know if I say it so clear )  and a bit of additional logic... 





>  ------------ Původní zpráva ------------
>  Od: 邵明岐 <shaomq at gmail.com>
>  Předmět: FW: Can I create multi hash table?
>  Datum: 28.9.2006 07:45:00
>  ----------------------------------------
>   
>   
>  
>  Mingqi, Shao
>  
>   
>  
>    _____  
>  
>  发件人: memcached-bounces at lists.danga.com
>  [mailto:memcached-bounces at lists.danga.com] 代表 Mingqi Shao
>  发送时间: 2006年9月27日 12:40
>  收件人: Steven Grimm
>  抄送: memcached at lists.danga.com
>  主题: Re: Can I create multi hash table?
>  
>  
>  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. 
>  
>  
>  
>  在06-9-27，Steven Grimm <sgrimm at facebook.com> 写道： 
>  
>  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>: 
>  
>  可以。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
>  
>  
>  邵明岐 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.
>  
>  
>  
>  
>  
>  
>  
>  
>