Hi Upayavira,

My queries has all the features: search, sorting, grouping, faceting. As I
was working on the project, I noticed the response time of the query got
longer and longer as I added these features.

I was reading the solr-ref-guide-4.7, and the following is from page 66. I
thought covert the field types to Trie* may improve the performance:

"The standard way that Solr builds the index is with an inverted index. This
style builds a list of terms found in all the documents in the index and
next to each term is a list of documents that the term appears in (as well
as how many times the term appears in that document). This makes search very
fast - since users search by terms, having a ready list of term-to-document
values makes the query process faster.

For other features that we now commonly associate with search, such as
sorting, faceting, and highlighting, this approach is not very efficient.
The faceting engine, for example, must look up each term that appears in
each document that will make up the result set and pull the document IDs in
order to build the facet list. In Solr, this is maintained in memory, and
can be slow to load (depending on the number of documents, terms, etc.).

In Lucene 4.0, a new approach was introduced. DocValue fields are now
column-oriented fields with a document-to-value mapping built at index time.
This approach promises to relieve some of the memory requirements of the
fieldCache and make lookups for faceting, sorting, and grouping
much faster."

Thanks



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