How Lucene reduces CPU usage over full-text search of sql server? -

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i had read article how stackoverflow reduced cpu usage using lucene.

but question how ?

is due caching of lucene ?

and if yes. if implement sqlserver fts memcache. same lucene ?

or lucene uses different data structures search ?

lucene using indexing , full text search - it's more caching.

sql set-based relational language. it's not built ad hoc queries of documents. technology different.


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