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From Chris Hostetter <>
Subject Re: Huge increase in index size adding just 2 fields
Date Thu, 06 Nov 2008 16:43:44 GMT
: We added the following 2 fields to the above schema as follows:
: <field name="date" type="date" indexed="true" stored="true" required="true"/>
: <field name="hlb" type="string" indexed="true" stored="true"
: multiValued="true"/>
: where the "hlb" field consists of not more than 3-4 strings such as "Social
: Sicence"/
: Our 500,000 document index size increased to 166G!  This seems completely

if you don't need fieldNorms for these fields (it almost never makes sense 
for dates and based on your description of hlb i doesn't sound like you'd 
need it there either) make sure that's disabled (you might already be 
doing that in the fieldType declarations, but i'm not sure)

another way to reduce the amount of space (and improve date range query 
speed) is to reduce the granulatiry of hte dates you index (ie: round off 
to the nearest second, minute, hour, or day) so the number of unique terms 
in the field is reduced.


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