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From Mark Miller <>
Subject Re: Upper limit on number of Fields
Date Mon, 16 Feb 2009 00:29:16 GMT
In my experience, the main issue to be concerned about with tons of 
fields is norms. You'll likely have to turn them off for most of the 
fields unless you have plenty of RAM to burn. They are stored in byte 
arrays of size maxdoc for each field (eg non sparse). Other than that, I 
don't think there is a pronounced penalty in my experience for tons of 
fields. 10,000 fields is probably more than I have ever seen though, so 
do report back how it goes.

- Mark

Joel Halbert wrote:
> Hi,
> Is there any practical limit on the number of fields that can be
> maintained on an index?
> My index looks something like this, 1 million documents. For each group
> of 1000 documents I might have 10 indexed fields. This would mean in
> total about 10000 fields. Am I going to run into any issues here?
> The index in Ram based.
> Rgs,
> Joel 
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