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From Chris Hostetter <>
Subject Re: Impact of compressed=true attribute (in schema.xml) on Indexing/Query
Date Thu, 03 Sep 2009 23:26:56 GMT

: Now the question is, how the compressed=true flag impacts the indexing 
: and Querying operations. I am sure that there will be CPU utilization 
: spikes as there will be operation of compressing(during indexing) and 
: uncompressing(during querying) of the indexed data. I am mainly looking 
: for any bench marks for the above scenario.

i don't have any hard numbers for you, but the stored data isn't 
uncompressed when executing aquery -- queries are executed against the 
indexed terms (which are never compressed) ... the only time the data will 
be uncompressed is when returning results to the client -- so if you set 
rows=17 in your request, only the values for the 17 docs returned  (or 
less if there were fewer then 17 matches) will be uncompressed.


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