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From Erick Erickson <>
Subject Re: Is it a good query performance with this data size ?
Date Wed, 19 Aug 2015 16:23:41 GMT
bq:  can I limit the size of the three
caches so that the RAM usage will be under control

That's exactly what the "size" parameter is for.

As Upayavira says, the rough size of each entry in
the filterCache is maxDocs/8 + (sizeof query string).

queryResultCache is much smaller per entry, it's
roughly (sizeof entire query) + ((sizeof Java int) * <queryResultWindowSize>)

<queryResultWindowSize> is from solrconfig.xml. The point
here is this is rarely very bug unless you make the
queryResultCache huge.

As for documentResultCache, it's also usually not
very large, it's the (size you declare it) * (average size of a doc).


On Wed, Aug 19, 2015 at 9:12 AM, wwang525 <> wrote:
> Hi Upayavira,
> Thank you very much for pointing out the potential design issue
> The queries will be determined through a configuration by business users.
> There will be limited number of queries every day, and will get executed by
> customers repeatedly. However, business users will change the configurations
> so that new queries will get generated and also will be limited. The change
> can be as frequent as daily or weekly. The project is to supporting daily
> promotional based on fresh index data.
> Cumulatively, there can be a lot of different queries. If I still want to
> take the advantage of the filterCache, can I limit the size of the three
> caches so that the RAM usage will be under control?
> Thanks
> --
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