Why should recyle cache should be smaller then buffer pool.

Hi,
I am going through a documnetaion, where i read that your recyle cahche should be smaller then your buffer pools and it should be use buffers more quickly then .the idea behiend having a recycle cache is that if the sql statment is tuned then put the large segmant in recycle cahche so it does not effect others segmant in cache to edge out more frequentlly then it should be?now i wanted to know that what is the reason of taknig recyle cache smaller then buffer pool and why it should use buffers more quickly then the default buffer pool?and am i putting the right picture of recycle cache ?
thanks and regards
Alok Kumar...

Hi Alok,
I asume you mean by buffer the default buffer cache, right ?
The only idea why a recycle buffer cache should be smaller than another cache can be for memory reasons: not to spend to much memory for cache. But I cannot image this should be a general guide all all kind of application ...
On the other I have the impression that your picture of the recycle cache is a little bit different to my's picture:
I only will use different caches if have very different tables and indexes (not sql stmts). Each table and index will be assigned to a cache, e.g. the default cache and the recycle cache. The goal is, as you described, to prtend small tables and indexes from ageing out of the default cache. But the access to the recycle cache is as fast as to the default cache: both are in memory. The only diference is the administration of the blocks into the cache. The recycle cache has an administration of the blocks much easier and faster as the other one.
I hope this will give you some answers (and porb. some new questions) ...
greets,
Rainer

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