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From Avlesh Singh <>
Subject Re: Is caching worth it when my whole index is in RAM?
Date Tue, 01 Sep 2009 02:02:25 GMT
Good question!
The application level cache, say filter cache, would still help because it
not only caches values but also the underlying computation. Even with all
the data in your RAM you will still end up doing the computations every

Looking for responses from the more knowledgeable.


On Mon, Aug 31, 2009 at 8:25 PM, Michael <> wrote:

> Hi,
> If I've got my entire 20G 4MM document index in RAM (on a ramdisk), do I
> have a need for the document cache?  Or should I set it to 0 items, because
> pulling field values from an index in RAM is so fast that the document
> cache
> would be a duplication of effort?
> Are there any other caches that I should turn off if I can get my entire
> index in RAM?  Filter cache, query results cache, etc?
> Thanks!
> Michael

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